JP6653436B2 - Method for producing drinking water composition and drinking water composition - Google Patents

Description

  The present invention relates to a method for producing a drinking water composition containing minerals eluted from powder of igneous rock and / or contact metamorphic rock, and a drinking water composition.

  Patent Literature 1 discloses that various kinds of mineral-derived ions obtained by adding fine granules of a mineral containing granite (biotite) to an aqueous solution of a specific inorganic acid, a specific alkali metal or a specific alkaline earth metal are obtained. Disclosed is a drinking water containing various kinds of minerals in which a solution containing water is diluted with water, filtered, and further mixed with soluble chitosan.

  Patent Literature 2 discloses a drinking water mixture in which granules of SGE ore are packaged in a water-permeable middle bag together with drinking water in a commercially available plastic bottle.

WO2013-073644 JP 2010-253402 A

  However, in the drinking water disclosed in Patent Document 1, the inorganic acid used in the process of eluting minerals from granite is a strong acid such as sulfuric acid, hydrochloric acid or nitric acid, and an aqueous alkali metal solution or aqueous alkaline earth metal solution is hydroxylated. Since it is an aqueous solution of sodium, potassium hydroxide or calcium hydroxide, which is a strong alkali aqueous solution, it is required to neutralize or remove it before completing the final food from the viewpoint of food hygiene. From the viewpoint of productivity and quality control It is not suitable for industrial production.

  Further, the drinking water mixture disclosed in Patent Literature 2 has low mineral elution efficiency because the SGE ore is only in contact with the drinking water.

  The present invention provides a method for producing a drinking water composition in which minerals are eluted from powders of igneous rocks and / or contact metamorphic rocks, in which the efficiency of mineral elution is improved, and restrictions on food hygiene are reduced and productivity is improved. An object of the present invention is to provide a safer drinking water composition rich in the types of minerals to be contained.

The present invention
[1] A method for producing a drinking water composition having a step of eluting minerals from powder of igneous rock and / or contact metamorphic rock with an organic acid or an aqueous solution thereof that can be used as a food additive (hereinafter, also referred to as the present invention 1), and ,
[2] A drinking water composition obtainable by the production method according to the above item [1] (hereinafter, also referred to as the present invention 2).

  ADVANTAGE OF THE INVENTION According to this invention, in the process of eluting minerals from the powder of igneous rock and / or contact metamorphic rock, the manufacturing method of the drinking water composition in which the elution efficiency of minerals was improved, the restrictions on food hygiene were small, and the productivity was improved. Thus, it is possible to provide a safer drinking water composition rich in the types of minerals contained.

1 is an example of an embodiment of the present invention 1. 5 is a time-dependent change in the conductivity of the elution system in the elution step of the present invention 1 according to Example 1. 5 is a time-dependent change in the electrical conductivity of the elution system in the elution step of the present invention 1 according to Examples 1 and 2. 5 is a change with time of the conductivity of the elution system in the elution step when the scale-up of the present invention 1 is performed.

(Production method of drinking water composition)
The present invention 1 has a step of eluting minerals from igneous rock and / or contact metamorphic rock powder with an organic acid or an aqueous solution thereof that can be used as a food additive (hereinafter also referred to as an elution step).

(Igneous rock)
In the present invention 1, igneous rock is a rock obtained by cooling and solidifying magma,
Volcanic rocks such as komatiite, basalt, andesite, dacite, rhyolite, porphyry, porphyry, quartz porphyry, granite porphyry that magma cooled in a short time, and
Plutonites such as peridotite, gabbro, diorite, granodiorite, and granite cooled by magma for a long time can be used.
From the viewpoint of the variety of minerals considered to be useful to the human body eluted by the organic acid described below, preferably plutonic rock, more preferably peridotite, gabbro, diorite, granodiorite and granite And at least one rock selected from the group consisting of: and more preferably granite.

(Contact metamorphic rocks)
The contact metamorphic rock according to the first aspect of the present invention is a metamorphic rock obtained by transforming existing rocks by the heat of magma, and is a crystalline limestone represented by marble, which is formed by changing limestone by contact metamorphism.
Magma comes into contact with limestone, and magma components (silicon, iron, aluminum, etc.) react with limestone component (calcium). Hornfels and the like changed by the action can be used.

  Hornfels is preferred among the contact metamorphic rocks from the viewpoints of many kinds of minerals considered to be useful to the human body eluted by the organic acid described later and low uranium content (safety).

In Invention 1 and Invention 2, Hornfels is a contact metamorphic rock having the following chemical composition:
(1) SiO ₂
Preferably 55-85% by weight, more preferably 60-75% by weight, even more preferably 65-75% by weight;
(2) Al ₂ O ₂
Preferably 5 to 25% by weight, more preferably 10 to 20% by weight;
(3) Fe ₂ O ₂
Preferably 1 to 10% by weight, more preferably 1 to 5% by weight;
(4) TiO ₂
Preferably 0.1 to 2% by weight, more preferably 0.1 to 1% by weight;
(5) CaO
Preferably 1 to 10% by weight, more preferably 1 to 5% by weight;
(6) MgO
Preferably 1 to 10% by weight, more preferably 1 to 5% by weight;
(7) Na ₂ O
Preferably 1 to 10% by weight, more preferably 2 to 6% by weight;
(8) K ₂ O
Preferably 1 to 10% by weight, more preferably 1 to 5% by weight;
(9) MnO
Preferably 0.01 to 1% by mass, more preferably 0.01 to 0.1% by mass;
(10) Loss on ignition (Ig. Loss)
Preferably it is 1-5 mass%, more preferably 1-3 mass%.

  Examples of the hornfels include mudstone contact-modified muddy hornfels, chert contact-modified siliceous hornfels, and sandstone contact-modified sandstone hornfels, and the like. From the viewpoint of the number of types of uranium and the low leaching uranium amount (safety), sandstone hornfels are preferably sandstones, more preferably sandstone hornfels derived from marine sedimentary rocks constituting the Shimanto Belt in Japan, and even more preferably Oita Prefecture or South. Sandstone hornfels collected in Kyushu (preferably Kagoshima Prefecture or Miyazaki Prefecture), more preferably Oita Prefecture or Miyazaki Prefecture.

  For example, sandstone hornfels collected at the prefectural border between Oita Prefecture and Miyazaki Prefecture are among the minerals useful for the human body, in addition to compounds containing major mineral elements such as magnesium oxide, aluminum oxide, ferric oxide, and potassium oxide. Rocks contain trace metal elements such as vanadium, rubidium, titanium and zirconium which are difficult to collect and radioactive rare earth elements such as uranium, thorium, lanthanum, lutetium and erbinium.

  For example, according to the analysis results by the Oita Prefectural Industrial Science and Technology Center, the hornfels sandstone collected at the prefectural border between Oita and Miyazaki has the composition shown in Table 1.

(Powder of igneous rock and / or contact metamorphic rock)
In the dissolution step, igneous rock and / or contact metamorphic rock are used as powder from the viewpoint of the dissolution efficiency of the drinking water composition containing abundant minerals (hereinafter also referred to as dissolution efficiency).

  The particle diameter of the powder of the igneous rock and / or the contact metamorphic rock has a nominal size based on JIS Z 8801-1 and preferably passes through a sieve of 38 to 850 μm, more preferably 38 to 500 μm, from the viewpoint of elution efficiency. A degree to pass through a sieve, more preferably a degree to pass through a 38 to 250 μm sieve, more preferably a degree to pass through a 38 to 125 μm sieve, more preferably a degree to pass through a 38 to 63 μm sieve, more preferably 38 to 250 μm. It passes only through a 53 μm sieve.

(Organic acid)
In the present invention 1, the organic acid used as the solvent is preferably one that can be used as a food or food additive such as acetic acid.

The organic acid that can be used as a food additive is, for example, an organic acid as a food additive approved by a government agency that manages the safety of food additives in Japan.
According to the Ministry of Health, Labor and Welfare's website as of December 1, 2015 (http://www.mhlw.go.jp/stf/seisakunitsuite/bunya/kenkou_iryou/shokuhin/syokuten/index.html), the Ministry of Health, Labor and Welfare has designated Additives, "existing additives", "natural flavors" and "general food and beverage additives" (about 100 items) are approved for use as food additives.

As organic acids approved for use as food additives, for example,
The list of designated additives specified by the Ministry of Health, Labor and Welfare (Attached Table No. 1) (Revised on September 18, 2015)
Adipic acid, L-ascorbic acid (also called vitamin C), benzoic acid, erythorbic acid (also called isoascorbic acid), citric acid, gluconic acid, L-glutamic acid, succinic acid, fatty acids, oxalic acid, DL-tartaric acid (also called dl) -Tartaric acid), L-tartaric acid (also called d-tartaric acid), sorbic acid, nicotinic acid (also called niacin), lactic acid, glacial acetic acid, fumaric acid, propionic acid, hexanoic acid (also called caproic acid), folic acid, butyric acid, DL- Malic acid (also known as dl-malic acid);
List of existing additives includes L-aspartic acid, 5'-adenylic acid, alginic acid, isoalpha-bitter acid, itaconic acid, oligogalacturonic acid, higher fatty acids, 5'-cytidylic acid, hyaluronic acid, phytic acid, ferulic acid Acids, gallic acid, mevalonic acid and the like are mentioned.

As the organic acid in the present invention 1, organic acids that have been approved for use as these food additives can be preferably used, but from the viewpoint of dissolution efficiency and taste of the drinking water composition,
Preferably at least one compound selected from the group consisting of citric acid, L-tartaric acid, fumaric acid, DL-malic acid, succinic acid, lactic acid, acetic acid, gluconic acid and L-ascorbic acid,
More preferably at least one compound selected from the group consisting of citric acid, acetic acid and L-ascorbic acid,
More preferred is citric acid.

  In the present invention 1, citric acid preferably uses citric acid hydrate (preferably monohydrate) from the viewpoint of easy dissolution in water.

(Elution conditions)
In the elution step, the powder of the igneous rock and / or the contact metamorphic rock is eluted using the above-described organic acid or an aqueous solution thereof as a solvent to obtain an eluted aqueous solution mixture.

  The pH of the solvent is preferably 1 to 4, more preferably 1 to 3, and still more preferably 1 to 2, from the viewpoint of elution efficiency.

  The organic acid can be used as long as it is liquid, but from the viewpoint of elution efficiency and ease of pH control, it is preferable to use an aqueous solution of the organic acid.

  The pH of the organic acid aqueous solution can be adjusted by the degree of dilution with water, or separately by adding an organic acid.

  Tap water, distilled water, ion-exchanged water, etc. can be used as dilution water when using an aqueous solution of an organic acid.From the viewpoint of elution efficiency and ease of water quality control, tap water hardness is preferably 0 to 0. It is 120 mg / L, more preferably 1-110 mg / L, further preferably 10-100 mg / L, still more preferably 20-90 mg / L, and still more preferably 30-80 mg / L.

  It is preferable to use distilled water and / or ion-exchanged water as the dilution water when the aqueous solution of the organic acid is used, from the viewpoint of elution efficiency and ease of water quality control.

  The temperature of the solvent is preferably from 10 to 90 ° C, more preferably from 20 to 90 ° C, further preferably from 40 to 90 ° C, further preferably from 60 to 90 ° C, and still more preferably from 70 to 90 ° C, from the viewpoint of elution efficiency. is there.

  From the viewpoint of eluting a sufficient amount of mineral, the elution time is preferably 0.5 to 24 hours, more preferably 1 to 18 hours, further preferably 2 to 10 hours, and still more preferably 2 to 6 hours, The elution time can be reduced as the temperature of the solvent increases. The preferable elution time of the elution system containing the powder of the contact metamorphic rock and the solvent is preferably within the above range.

  The elution time is preferably 0.5 to 24 hours, more preferably 5 to 24 hours, and still more preferably 10 to 24 hours, from the viewpoint of eluting a sufficient amount of minerals in an elution system containing igneous rock powder and a solvent. The time is more preferably 15 to 24 hours. The higher the temperature of the solvent, the shorter the elution time.

  In the elution system containing the powder of the igneous rock and / or the contact metamorphic rock and the solvent, the amount of the solvent is preferably 100 to 10000 parts by mass, more preferably 200 to 100 parts by mass with respect to 100 parts by mass of the powder of the igneous rock and / or the contact metamorphic rock. It is 5,000 parts by mass, more preferably 300 to 3000 parts by mass, further preferably 300 to 1500 parts by mass, further preferably 500 to 1500 parts by mass, and still more preferably 500 to 1000 parts by mass.

  The elution system is preferably stirred from the viewpoint of elution efficiency. For example, when the stirring blade is rotated and stirred, the stirring is preferably performed at 1 to 100 rpm, more preferably 5 to 60 rpm, and still more preferably 10 to 30 rpm. is there.

(Production method of drinking water composition)
The method for producing a drinking water composition of the present invention 1 has a feature in the elution step, and includes the elution step as essential. If necessary, the following (1) to (2) as shown in FIG. And at least one of the steps (4) to (9).

(1) Powder Raw Material Production Step In the present invention 1, as the powder of igneous rock and / or contact metamorphic rock, a commercial product can be purchased and used if a small-scale drinking water composition is produced from a laboratory level. In the case of producing a drinking water composition, it is preferable to include a powder raw material production step.

  As the powder raw material production process, for example, excavation of the original soil or rock containing igneous rock and / or contact metamorphic rock, the excavated original soil or rock is, for example, crushed, sieved, or classified, etc. And / or crushing the selected igneous rock and / or contact metamorphic rock to obtain a powdered raw material.

(2) Solvent Production Step In the present invention 1, a solvent can be used as it is or in the form of an aqueous solution by purchasing a commercially available organic acid for producing a small-scale drinking water composition from a laboratory level. In the case of the production of a drinking water composition, for example, an organic acid is stored in an organic acid storage tank, the stored organic acid is diluted with water in an organic acid diluting tank, and the pH is adjusted as necessary, thereby obtaining It is preferable to provide a solvent production step of filling the aqueous solution of the organic acid into the elution tank.

(3) Elution Step In the present invention 1, the elution step can be carried out in a laboratory-level facility in the case of producing a small-scale drinking water composition from a laboratory level, but in the case of producing a large-scale drinking water composition. For example, the powder of igneous rock and / or contact metamorphic rock obtained in the powder raw material manufacturing process is filled in an elution tank in advance, and the organic acid aqueous solution obtained in the solvent manufacturing process is charged therein, and the temperature is adjusted as necessary. It is preferable to provide a step of obtaining an eluted aqueous solution mixture by performing adjustment.
The eluted aqueous solution mixture is preferably stored in a relay tank.

(4) Classification Step In the present invention 1, it is preferable to include a classification step of classifying the eluted aqueous solution mixture and removing coarse solids in the eluted aqueous solution mixture as necessary.

(5) Filtration Step In the present invention 1, for example, it is preferable to provide a filtration step of removing impurities such as insoluble components through a filter (preferably via a classification step) to obtain a filtrate.
The filtrate is preferably stored in a filtration tank.
Before and / or after the filtration step, a coagulant may be added to coagulate and remove impurities.

(6) Sterilization Step The present invention 1 preferably includes a sterilization step of sterilizing the filtrate, preferably by heating and irradiating ultraviolet rays, more preferably by heating, if necessary.

(7) Additive mixing step In the present invention 1, if necessary, the five-sense properties such as taste, aroma, and color of the filtrate, storage stability, pH, viscosity, specific gravity, surface tension, and aqueous solution properties such as hardness are adjusted. It is preferable to provide an additive mixing step of adding a food additive for the addition as an additive.

(8) Bottle Filling Step In the present invention 1, for example, a filtrate (a filtrate passed through a sterilization step and / or an additive mixing step, if necessary) is filled into a bottle such as a can for drinking water, a bottle, and a PET bottle. It is preferable to include a bottle packing step of attaching a label or the like on each bottle as necessary with necessary information.

(9) Product Storage Step In the present invention 1, for example, the filtrate packed in the bottle packing step may be stored as it is or may be stored in a warehouse or the like, and the filtrate (if necessary, the sterilization step and / or Alternatively, the filtrate through the additive mixing step) may be stored in the product storage tank and stored in the product storage tank.

  For example, the filtrate in the stored bottle or product storage tank described above is the drinking water composition of the present invention.

  The filtrate in the product storage tank may be commercialized as a concentrate of the drinking water composition, or the filtrate in the product storage tank is preferably 2 to 10,000 times in order to adjust the acidity of the filtrate in the product storage tank, More preferably, the product may be diluted 10 to 1000 times, more preferably 10 to 100 times, to produce a product.

  The commercialized drinking water composition is preferably diluted 2 to 10000 times, more preferably 10 to 1000 times, and still more preferably 10 to 100 times, based on the filtrate in the product storage tank. Can be provided.

The stored drinking water composition may be shipped, for example, in a bottle.
The drinking water composition stored in the product storage tank may be supplied from the product storage tank to the bottle filling step, or may be refilled from the product storage tank into a tank lorry and transported to a consumer.

  The drinking water composition produced by the present invention 1 is suitable as the drinking water composition of the present invention 2.

(Drinking water composition)
Invention 2 is a drinking water composition which is an object of production of Invention 1 and can be obtained by the production method of Invention 1.

  The present invention 2 uses an organic acid used for foods or as a food additive as a solvent in the present invention, so that an eluate using an inorganic acid, an alkali metal or an alkaline earth metal as a solvent is used. It is safer than before, and there is no step of neutralizing the inorganic acid, alkali metal or alkaline earth metal, so there is no mixing of compounds derived from these neutralizing agents, so the taste is not impaired, and it is safer. Productivity is also improved.

  Since the powder of igneous rock and / or contact metamorphic rock is eluted with an organic acid or an aqueous solution thereof that can be used for food or as a food additive according to the present invention 2, fine particles of minerals including granite (biotite) are identified. As compared to drinking water obtained by eluting with an inorganic acid, an aqueous solution of a specific alkali metal or a specific alkaline earth metal, and drinking water obtained by eluting granular SGE ore with water, The variety of minerals is rich and sour.

Invention 2 preferably comprises, for example, the following minerals:
(A) Aluminum (Al)
Preferably 100 to 10000 mg / L, more preferably 500 to 5000 mg / L, even more preferably 1000 to 3000 mg / L;
(B) Barium (Ba)
Preferably 0.1 to 100 mg / L, more preferably 0.2 to 50 mg / L, still more preferably 0.5 to 20 mg / L, and still more preferably 1 to 10 mg / L;
(C) Calcium (Ca)
Preferably 10 to 5000 mg / L, more preferably 50 to 3000 mg / L, still more preferably 100 to 2000 mg / L, and still more preferably 200 to 1500 mg / L;
(D) Chrome (Cr)
Preferably 0.1 to 100 mg / L, more preferably 0.2 to 50 mg / L, still more preferably 0.5 to 20 mg / L, and still more preferably 1 to 10 mg / L;
(E) Iron (Fe)
Preferably 100 to 10000 mg / L, more preferably 500 to 7000 mg / L, still more preferably 1000 to 5000 mg / L, and still more preferably 1500 to 3000 mg / L;
(F) Potassium (K)
Preferably 100 to 5000 mg / L, more preferably 150 to 4000 mg / L, still more preferably 200 to 3000 mg / L, even more preferably 300 to 1500 mg / L;
(G) Lithium (Li)
Preferably 0.1 to 100 mg / L, more preferably 0.2 to 50 mg / L, still more preferably 0.5 to 20 mg / L, and still more preferably 1 to 10 mg / L;
(H) Magnesium (Mg)
Preferably 100 to 5000 mg / L, more preferably 150 to 4000 mg / L, still more preferably 200 to 3000 mg / L, even more preferably 300 to 1500 mg / L;
(I) Manganese (Mn)
Preferably 1 to 1000 mg / L, more preferably 5 to 500 mg / L, still more preferably 10 to 200 mg / L, and still more preferably 20 to 100 mg / L;
(J) Sodium (Na)
Preferably 1 to 1000 mg / L, more preferably 10 to 500 mg / L, still more preferably 20 to 300 mg / L, and still more preferably 50 to 200 mg / L;
(K) Nickel (Ni)
Preferably 0.1 to 100 mg / L, more preferably 0.2 to 50 mg / L, still more preferably 0.5 to 20 mg / L, and still more preferably 0.5 to 10 mg / L;
(L) Strontium (Sr)
Preferably 0.1 to 100 mg / L, more preferably 0.2 to 50 mg / L, still more preferably 0.5 to 20 mg / L, and still more preferably 1 to 10 mg / L;
(M) Titanium (Ti)
Preferably 1 to 1000 mg / L, more preferably 10 to 500 mg / L, still more preferably 20 to 300 mg / L, and still more preferably 50 to 200 mg / L;
(N) Vanadium (V)
Preferably 0.1 to 100 mg / L, more preferably 0.2 to 50 mg / L, still more preferably 0.5 to 20 mg / L, and still more preferably 1 to 10 mg / L;
(O) Zinc (Zn)
Preferably it is 0.1-100 mg / L, more preferably 0.2-50 mg / L, further preferably 0.5-20 mg / L, and still more preferably 1-10 mg / L.

The present invention 2 preferably contains the following compounds in addition to minerals.
(P) phosphorus (P)
Preferably 1 to 1000 mg / L, more preferably 5 to 500 mg / L, still more preferably 10 to 200 mg / L, and still more preferably 20 to 100 mg / L;
(Q) Silicon (Si)
Preferably it is 10-5000 mg / L, More preferably, it is 50-3000 mg / L, More preferably, it is 1002000 mg / L, More preferably, it is 200-1500 mg / L.

The present invention 2 is based on
The content of at least uranium is preferably less than 30 μg / L, more preferably 25 μg / L or less, and further, the thorium content is preferably 1000 μg / L or less, more preferably 700 μg / L or less, and still more preferably. Is 500 μg / L or less.

  The pH of the present invention 2 is preferably 2 to 6, more preferably 2 to 5, still more preferably 2 to 4, and still more preferably 2 to 3, from the viewpoint of appropriate acidity.

  The present invention 2 comprises, if necessary, compounding a food additive for adjusting the five-sense properties such as taste, aroma and color, storage stability, aqueous solution properties such as pH, viscosity, specific gravity, surface tension and hardness. Can be.

  As described above, the present invention 2 is more suitable for health foods and supplements because it contains more types of minerals, is safer, and can have an appropriate acidity as compared with conventional mineral-containing drinking water.

  Furthermore, as the agricultural methods after World War II, for example, changes in agricultural methods centering on chemical fertilizers, since 1950, iron and vitamin C, which are trace minerals in spinach, have been drastically reduced. It is thought that the necessity of the present invention 2 is further increased due to the increasing importance of supplementing the mineral supply from.

〔raw materials〕
(1) Contact metamorphic rock: sandstone hornfels powder having the chemical composition shown in Table 1 (manufactured by Only Corporation, passed through a nominal opening of 45 μm (325 mesh) sieve)
(2) Igneous rock: Granite having the chemical composition shown in Table 3 (corroded granite manufactured by Shimanishi Kaken Co., Ltd.) was pulverized in a mortar to obtain a powder having a nominal opening of 45 μm (325 mesh) passing through a sieve.
(3) Organic acid: citric acid monohydrate (1st grade, manufactured by Showa Chemical Co., Ltd.)
(4) Water: ion-exchanged water (5) Organic acid aqueous solution: An organic acid aqueous solution having a pH of 1.7 was prepared by adding 500 g of water to 50 g of an organic acid.

(Elution conditions)
(Example 1) Combination of sandstone hornfels and a solvent (aqueous organic acid solution) An organic acid aqueous solution (500 ml) was charged into a 1000 ml beaker, 100 g of sandstone hornfels powder was added, the temperature was raised to 80 ° C, and a stirrer was used. Elution was carried out at 80 ° C. for 24 hours under atmospheric pressure while stirring at 10 to 20 rpm.

(Example 2) Combination of granite and solvent (organic acid aqueous solution) A 1000 ml beaker was filled with an organic acid aqueous solution (500 ml), 100 g of granite powder was added, the temperature was raised to 80 ° C, and the mixture was heated to 10 ° C using a stirring rod. Elution was carried out at 80 ° C. for 24 hours under atmospheric pressure while stirring at 20 rpm.

(Example 3) Scale-up test of a combination of sandstone hornfels and a solvent (organic acid aqueous solution) A stainless steel container was filled with 10,000 ml of an organic acid aqueous solution, 2,000 g of sandstone hornfels powder was added, the temperature was raised to 80 ° C, and a stirring rod was used. Then, the mixture was eluted at 80 ° C. under atmospheric pressure for 24 hours while stirring at 10 to 20 rpm.

Using a conductivity measuring device (CM-31P manufactured by Toa DKK),
An elution system comprising the solvent of Example 1 and sandstone hornfels powder,
Elution system composed of solvent and granite powder of Example 2 The change with time of the conductivity of the elution system composed of the solvent of Example 3 and sandstone hornfels powder was measured (see FIGS. 2 to 4).

FIG. 3 shows conductivity data of the elution system of sandstone hornfels and water.
FIG. 4 shows the result (b) of the scale-up system with respect to the result (a) of FIG.

According to the examples, mineral leaching by citric acid, a typical edible organic acid, was observed for both typical igneous granite powder and typical contact metamorphic sandstone hornfels powder (relatively, the latter). Good (FIGS. 2 and 3), the effect was maintained even when scaled up (FIG. 4).

(Filtration conditions)
The composition after elution was allowed to stand at room temperature (20 to 25 ° C.) for 3 hours, and the supernatant was regarded as a filtrate to collect water to obtain a working drinking water composition of the present invention 2.

  In addition, it is preferable to cool the composition after elution industrially, for example, by cooling the storage tank of the composition with water for 0.5 to 1.5 hours to room temperature.

  The pH of the working drinking water composition of Invention 2 was 2.5.

〔analysis〕
The following drinking water composition of the present invention 2 obtained in Example 1 was subjected to qualitative analysis for 65 elements at Hitachi Power Solutions Co., Ltd. using the following apparatus, and 17 elements detected by the qualitative analysis were analyzed. Quantitative analysis was performed, and uranium and thorium were separately analyzed.
(1) Qualitative analysis of 65 elements: high-frequency inductively coupled plasma emission spectroscopy (ICP-AES) (OPTOMA 8300 manufactured by PerkinElmer)
(2) Quantitative analysis of sodium and potassium: Atomic absorption advanced method (Z2010, manufactured by Hitachi High-Technologies Corporation)
(3) Quantitative analysis of 15 elements other than sodium and potassium: high frequency inductively coupled plasma emission spectroscopy (ICP-AES) (OPTOMA 8300 manufactured by PerkinElmer)
(4) Quantitative analysis of uranium and thorium: high frequency inductively coupled plasma mass spectrometry (ICP-MS) (Agilent Technology, Agilent 8800x type)

  Table 2 shows the results of quantitative analysis of 17 elements and uranium and thorium contained in the working drinking water composition of the present invention 2 obtained in Example 1 according to the present invention.

(Sensory test)
When 10 ml of the present invention 2 obtained in Example 1 was drunk, it was confirmed that it can be used as drinking water having a slightly strong acidity and good taste.

Claims (6)

A method for producing a drinking water composition comprising a step of eluting minerals from powder of igneous rock and / or contact metamorphic rock with an organic acid or an aqueous solution thereof that can be used as a food additive (however, the aqueous solution containing the powder from the step) vibration frequency except the step of irradiating an hour or more per second more than 20,000 ultrasonic waves to, basalt containing mica and mica from the igneous rock, andesite, rhyolite, Hin'iwa, quartz porphyry, diorite And granite ).   A method for producing a drinking water composition comprising a step of eluting minerals from powder of contact metamorphic rock with an organic acid or an aqueous solution thereof that can be used as a food additive.   2. The organic acid is at least one compound selected from the group consisting of citric acid, L-tartaric acid, fumaric acid, DL-malic acid, succinic acid, lactic acid, acetic acid, gluconic acid and L-ascorbic acid. Or the manufacturing method of the drinking water composition of 2.   The method for producing a drinking water composition according to any one of claims 1 to 3, wherein the pH is 2 to 6.   The method for producing a drinking water composition according to any one of claims 1 to 4, wherein uranium is less than 30 µg / L in the drinking water composition. A drinking water composition obtainable by the method for producing a drinking water composition according to claim 1.