JP3605454B2 - Simple chrysotile discrimination method - Google Patents
Simple chrysotile discrimination method Download PDFInfo
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- JP3605454B2 JP3605454B2 JP26432995A JP26432995A JP3605454B2 JP 3605454 B2 JP3605454 B2 JP 3605454B2 JP 26432995 A JP26432995 A JP 26432995A JP 26432995 A JP26432995 A JP 26432995A JP 3605454 B2 JP3605454 B2 JP 3605454B2
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- JP
- Japan
- Prior art keywords
- chrysotile
- fibrous substance
- titanium yellow
- fibrous
- color reaction
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
- Treatment Of Fiber Materials (AREA)
Description
【0001】
【発明の属する技術分野】
本発明は、繊維状物質または繊維状物質を含む材料にクリソタイルが含まれているか、否かを迅速且つ簡便に判別するための方法に関するものである。
【0002】
【従来の技術・課題】
クリソタイルは、補強性、耐熱性、耐久性等に優れた繊維であることから、建材や耐火被覆等幅広い分野で使用されてきた。しかし、年々使用規制が強化されると共にその使用が手控えられ、多くの分野で脱クリソタイル化が進行しつつある。
【0003】
一方、過去において製造、使用された材料にはクリソタイルを含んだものも多量に存在しており、施工現場または解体現場等において、短時間且つ簡便にクリソタイルの有無を判別できる方法が必要とされている。
【0004】
クリソタイルの有無を判別する一般的な方法としてはX線回折法、偏光顕微鏡、電子顕微鏡等による顕微鏡観察ないしこれらを併用する方法が広く用いられている。しかし、これらの方法はいずれも特定の装置を必要とする上、X線回折法においては有資格者をX線作業主任者として選任する必要がある。また、顕微鏡観察においては観察技術を習得する必要がある。
【0005】
そこで、本発明者等は、顕微鏡法によるクリソタイルの簡易判別技術として分散染色法を利用した方法を先に提案している(特願平5−325043号)。この方法を用いれば、顕微鏡法により迅速且つ簡便にクリソタイルの有無を判別することが可能となる。しかし、顕微鏡を必要とするという基本的な課題を解決するには至っていない。
【0006】
一方、化学分析によるクリソタイルの分析方法として、例えばアスベステスト(Asbestest: E-C APPARATUS CORPORATION)がある。この方法では試料を特定のフィルター付カラムに入れ、グリセリン処理を行い、蒸留水で洗浄し、残留物にリン酸を加え、指示薬[4−(ニトロフェニルアゾ)レソルシノール]を加え、呈色反応させることによりクリソタイルを判別するものである。しかし、この方法は分析に手数がかかり、施工・解体現場等で誰でも簡便且つ迅速に判別を行うことは困難であった。
【0007】
従って、本発明の目的は、誰でも簡便且つ迅速に繊維状物質または繊維状物質を含む材料中のクリソタイルの有無を判別できる方法を提供することにある。
【0008】
【課題を解決するための手段】
本発明者らは、上記課題を解決すべく鋭意研究を重ねた結果、繊維状物質あるいは繊維状物質を含む材料に特定の薬液を直接滴下し、その呈色反応により前記繊維状物質あるいは繊維状物質を含む材料中にクリソタイルが存在するか、否かを簡便且つ容易に判別できることを見出し、本発明を完成した。
【0009】
即ち、本発明は、繊維状物質または繊維状物質を含む材料に、チタン・イエローと、水酸化ナトリウム溶液とを滴下することによって生じる呈色反応により、繊維状物質がクリソタイルであるか、否かを判別することを特徴とするクリソタイルの簡易判別方法を提唱することにある。
【0010】
クリソタイルはケイ酸マグネシウム鉱物であり、本発明はクリソタイル中に含まれるMgの呈色反応を利用するものである。ここで、呈色反応の指示薬としてチタン・イエローを使用すれば、クリソタイルの呈色反応とクリソタイル代替として利用されているセピオライト等の他の繊維状ケイ酸マグネシウム鉱物の呈色反応が異なる。また、クリソタイル代替としてしばしば利用されている鉱物としてはウォラストナイト等があるが、ウォラストナイトはMgをほとんど含有しておらず、チタン・イエローによる呈色反応において判別は容易である。
【0011】
また、薬液としてチタン・イエローと水酸化ナトリウム溶液とを繊維状物質または繊維状物質を含む材料に滴下した場合、クリソタイルでは赤色を呈するのに対し、セピオライトやウォラストナイトは橙色を呈するので容易に識別が可能である。
【0012】
本発明方法において、チタン・イエローは濃度0.05〜0.1%の範囲内のものを使用することが好ましい。ここで、濃度が0.05%未満の場合には試料の着色が薄く、判別が困難であるために好ましくなく、また、濃度が0.1%を超えると試料の着色が濃すぎて、判別が困難であるために好ましくない。なお、チタン・イエローを使用する場合には、試料溶液のpHを12.5以上にするために水酸化ナトリウム溶液を併せて滴下することが必要である。ここで、チタン・イエローと水酸化ナトリウム溶液の滴下順序は問わない。
【0013】
なお、繊維状物質または繊維状物質を含む材料にチタン・イエローと水酸化ナトリウム溶液を滴下後、ガラス棒等で混合すれば、呈色反応がより鮮明となり、クリソタイルを含むか、否かをより識別し易くなる。
【0014】
【実施例】
以下に実施例を挙げて本発明のクリソタイルの簡易判別方法について更に説明する。
薬液の準備
チタン・イエロー
粉末状のチタン・イエローを純水で溶解し、濃度0.1%のチタン・イエロー指示薬を得た。
【0015】
実施例1
耐火被覆として鉄骨に吹付られていた繊維状物質を時計皿上に分取し、6規定の水酸化ナトリウム溶液とチタン・イエローを滴下したところ赤色に呈色した。この繊維状物質をX線回折法及び偏光顕微鏡観察したところクリソタイルを多量に含んでいることが判明した。
【0016】
比較例1
実施例1で試験した耐火被覆とは異なる別の耐火被覆材を時計皿上に分取し、6規定の水酸化ナトリウム溶液とチタン・イエローを滴下したところ橙色を示した。X線回折法ではクリソタイルのピークは認められず、偏光顕微鏡観察の結果、ガラス質繊維及びセルロースパルプは確認されたが、クリソタイルは認められなかった。
【0017】
【発明の効果】
本発明のクリソタイルの簡易判別方法によれば、水酸化ナトリウム溶液とチタン・イエローを薬液として繊維状物質または繊維状物質を含む材料に滴下し、その呈色反応により、誰でも簡便且つ迅速にクリソタイルの有無を判別することができる。[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for quickly and easily determining whether or not chrysotile is contained in a fibrous substance or a material containing a fibrous substance.
[0002]
[Conventional technology and issues]
Chrysotile has been used in a wide range of fields such as building materials and fire-resistant coatings because it is a fiber having excellent reinforcing properties, heat resistance, durability and the like. However, use regulations have been tightened year by year and their use has been withheld, and dechrysotile has been progressing in many fields.
[0003]
On the other hand, in the past, a large amount of chrysotile-containing materials also existed in the materials used and used, and there was a need for a method capable of quickly and easily determining the presence or absence of chrysotile at a construction site or a dismantling site. I have.
[0004]
As a general method for determining the presence or absence of chrysotile, X-ray diffraction, microscopic observation using a polarizing microscope, an electron microscope or the like, or a method of using them in combination is widely used. However, each of these methods requires a specific device, and in the X-ray diffraction method, it is necessary to appoint a qualified person as a chief X-ray operator. In addition, it is necessary to learn an observation technique in microscope observation.
[0005]
Therefore, the present inventors have previously proposed a method utilizing a disperse staining method as a simple technique for distinguishing chrysotile by microscopy (Japanese Patent Application No. Hei 5-325043). With this method, it is possible to quickly and easily determine the presence or absence of chrysotile by microscopy. However, it has not yet solved the basic problem of requiring a microscope.
[0006]
On the other hand, as an analysis method of chrysotile by chemical analysis, for example, there is an Asbestest (EC APPARATUS CORPORATION). In this method, a sample is put into a specific filter-equipped column, treated with glycerin, washed with distilled water, phosphoric acid is added to the residue, an indicator [4- (nitrophenylazo) resorcinol] is added, and a color reaction is performed. Thus, the chrysotile is determined. However, this method requires a lot of time for analysis, and it has been difficult for anyone to easily and quickly make a determination at a construction site or a dismantling site.
[0007]
Accordingly, an object of the present invention is to provide a method that allows anyone to easily and quickly determine the presence or absence of chrysotile in a fibrous substance or a material containing a fibrous substance.
[0008]
[Means for Solving the Problems]
The present inventors have conducted intensive studies to solve the above-mentioned problems, and as a result, a specific chemical solution is directly dropped on a fibrous substance or a material containing a fibrous substance, and the fibrous substance or fibrous The present inventors have found that it is possible to easily and easily determine whether or not chrysotile exists in a material containing a substance, and have completed the present invention.
[0009]
That is, the present invention relates to a fibrous substance or a material containing a fibrous substance, a color reaction caused by dropping titanium yellow and sodium hydroxide solution to determine whether the fibrous substance is chrysotile or not. The present invention proposes a simple chrysotile discrimination method characterized by discriminating.
[0010]
Chrysotile is a magnesium silicate mineral, and the present invention utilizes a color reaction of Mg contained in chrysotile. Here, the use of titanium yellow, color reaction of other fibrous magnesium silicate minerals such as sepiolite, which is used as a color reaction with chrysotile alternative chrysotile different as the indicator of the color reaction. Further, As the mineral is often used as chrysotile alternative is wollastonite, etc., wollastonite scarcely contain Mg, discrimination in color reaction by titanium yellow is easy.
[0011]
In addition, when as the chemical solution and a titanium yellow and sodium hydroxide was added dropwise to a material having a fibrous material or fibrous material, while the chrysotile exhibits red, since sepiolite or wollastonite exhibits orange It can be easily identified.
[0012]
In the method of the present invention, it is preferable to use titanium yellow having a concentration in the range of 0.05 to 0.1%. Here, when the concentration is less than 0.05%, the coloring of the sample is light and it is difficult to make a distinction, which is not preferable. On the other hand, when the concentration exceeds 0.1%, the coloring of the sample is too dark and the distinction is made. Is not preferred because it is difficult. When titanium yellow is used, it is necessary to add a sodium hydroxide solution together with the solution so that the pH of the sample solution is 12.5 or more. Here, the order of dropping the titanium yellow and the sodium hydroxide solution does not matter.
[0013]
If titanium / yellow and sodium hydroxide solution are dropped onto a fibrous substance or a material containing a fibrous substance and then mixed with a glass rod or the like, the color reaction becomes clearer, and whether or not chrysotile is contained is determined. It becomes easy to identify.
[0014]
【Example】
Hereinafter, the method for easily determining chrysotile of the present invention will be further described with reference to examples.
Preparation of chemical solution
The titanium yellow powdery titanium yellow was dissolved in pure water to obtain a concentration of 0.1% titanium yellow indicator.
[0015]
Example 1
The fibrous material sprayed on the steel frame as a fire-resistant coating was collected on a watch glass, and a 6N sodium hydroxide solution and titanium yellow were dropped to give a red color . It has been found that contains this fibrous material a large amount of chrysotile was X-ray diffraction and polarizing microscopic observation.
[0016]
Comparative Example 1
Another fireproofing material different from the refractory coating tested in Example 1 was fractionated on a watch glass, showed orange was added dropwise a solution of sodium and titanium yellow hydroxide 6N. The X-ray diffractometry peak of chrysotile was not observed, the result of the observation with a polarizing microscope, although vitreous fibers and cellulose pulp was confirmed, chrysotile was observed.
[0017]
【The invention's effect】
According to chrysotile simple identification method of the present invention, a water sodium hydroxide solution and titanium yellow was added dropwise to a material having a fibrous material or fibrous material as the chemical, due to its color reaction, anyone easily and swiftly chrysotile Can be determined.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26432995A JP3605454B2 (en) | 1995-10-12 | 1995-10-12 | Simple chrysotile discrimination method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26432995A JP3605454B2 (en) | 1995-10-12 | 1995-10-12 | Simple chrysotile discrimination method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09105743A JPH09105743A (en) | 1997-04-22 |
| JP3605454B2 true JP3605454B2 (en) | 2004-12-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26432995A Expired - Fee Related JP3605454B2 (en) | 1995-10-12 | 1995-10-12 | Simple chrysotile discrimination method |
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| Country | Link |
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| JP (1) | JP3605454B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4696035B2 (en) * | 2006-07-25 | 2011-06-08 | 中部電力株式会社 | Asbestos judgment method |
| JP2008209392A (en) * | 2007-02-01 | 2008-09-11 | Tohoku Univ | Asbestos coloring discrimination method and asbestos content measurement method |
| JP6781441B2 (en) * | 2019-03-29 | 2020-11-04 | 広島県 | Asbestos detection agent, asbestos detection kit and asbestos detection method |
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1995
- 1995-10-12 JP JP26432995A patent/JP3605454B2/en not_active Expired - Fee Related
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| Publication number | Publication date |
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| JPH09105743A (en) | 1997-04-22 |
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