JPS6258465B2 - - Google Patents
Info
- Publication number
- JPS6258465B2 JPS6258465B2 JP55162217A JP16221780A JPS6258465B2 JP S6258465 B2 JPS6258465 B2 JP S6258465B2 JP 55162217 A JP55162217 A JP 55162217A JP 16221780 A JP16221780 A JP 16221780A JP S6258465 B2 JPS6258465 B2 JP S6258465B2
- Authority
- JP
- Japan
- Prior art keywords
- liquid
- measured
- residual chlorine
- potassium iodide
- unglazed
- Prior art date
- 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.)
- Expired
Links
- NLKNQRATVPKPDG-UHFFFAOYSA-M potassium iodide Chemical compound [K+].[I-] NLKNQRATVPKPDG-UHFFFAOYSA-M 0.000 claims description 51
- 239000007788 liquid Substances 0.000 claims description 47
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims description 34
- 229910052801 chlorine Inorganic materials 0.000 claims description 34
- 239000000460 chlorine Substances 0.000 claims description 34
- 238000000034 method Methods 0.000 claims description 13
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 claims description 11
- 229910052740 iodine Inorganic materials 0.000 claims description 11
- 239000011630 iodine Substances 0.000 claims description 11
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 4
- 238000005259 measurement Methods 0.000 claims description 3
- 239000003153 chemical reaction reagent Substances 0.000 claims description 2
- 229910052697 platinum Inorganic materials 0.000 claims description 2
- 229920002379 silicone rubber Polymers 0.000 claims description 2
- 239000004945 silicone rubber Substances 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 7
- 239000013078 crystal Substances 0.000 description 5
- 239000011259 mixed solution Substances 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 239000004927 clay Substances 0.000 description 4
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- NUIURNJTPRWVAP-UHFFFAOYSA-N 3,3'-Dimethylbenzidine Chemical compound C1=C(N)C(C)=CC(C=2C=C(C)C(N)=CC=2)=C1 NUIURNJTPRWVAP-UHFFFAOYSA-N 0.000 description 2
- 238000005660 chlorination reaction Methods 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- PNDPGZBMCMUPRI-UHFFFAOYSA-N iodine Chemical compound II PNDPGZBMCMUPRI-UHFFFAOYSA-N 0.000 description 2
- 239000012047 saturated solution Substances 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- QNGVNLMMEQUVQK-UHFFFAOYSA-N 4-n,4-n-diethylbenzene-1,4-diamine Chemical compound CCN(CC)C1=CC=C(N)C=C1 QNGVNLMMEQUVQK-UHFFFAOYSA-N 0.000 description 1
- 241000195493 Cryptophyta Species 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000004737 colorimetric analysis Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 239000006059 cover glass Substances 0.000 description 1
- 239000008235 industrial water Substances 0.000 description 1
- 235000015170 shellfish Nutrition 0.000 description 1
- 235000014214 soft drink Nutrition 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
- 230000009182 swimming Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/416—Systems
- G01N27/42—Measuring deposition or liberation of materials from an electrolyte; Coulometry, i.e. measuring coulomb-equivalent of material in an electrolyte
- G01N27/423—Coulometry
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Physics & Mathematics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Molecular Biology (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
Description
【発明の詳細な説明】
本発明は、上下水道、工業用水および河川等に
おける残留塩素の濃度を測定する残留塩素測定方
法および測定装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a residual chlorine measuring method and a measuring device for measuring the concentration of residual chlorine in water and sewage systems, industrial water, rivers, etc.
水処理の１つとして、塩素処理は極めて重要な
役割を果しており、上水道における殺菌のための
塩素処理をはじめ、プール、下水放流水、清涼飲
料水用滅菌水、浴場、クリーニングから発電所、
工場、船舶等の冷却水に対する藻類、貝類の進入
防止やスライム防止等を目的とするものまで多く
の分野で広範囲に行なわれている。このような塩
素処理において、使用する塩素量の適正化を計る
一般的な方法として、処理後の残留塩素濃度を測
定して注入塩素量を調節する方法がある。而し
て、残留塩素測定法として従来から知られている
主な方法にジエチルパラフエニレンジアミン（以
下「DPD」と略す）法とオルトトリジン法があ
るが、前者はDPDが塩素によつて酸化されて赤
色を呈することから該赤色濃度を比色測定するこ
とにより残留塩素濃度を測定する方法であり、後
者はオルトトリジンが塩素の存在によつて黄色ホ
ロキノンを生成するので、該黄色濃度を比色測定
することにより残留塩素濃度を測定する方法であ
る。 As a type of water treatment, chlorination plays an extremely important role, including chlorination for disinfection in water supplies, swimming pools, sewage discharge water, sterilized water for soft drinks, baths, cleaning, power plants, etc.
It is widely used in many fields to prevent algae and shellfish from entering the cooling water of factories, ships, etc., and to prevent slime. In such chlorine treatment, a common method for optimizing the amount of chlorine used is to measure the residual chlorine concentration after treatment and adjust the amount of chlorine injected. The main methods conventionally known for measuring residual chlorine are the diethyl paraphenylene diamine (hereinafter abbreviated as "DPD") method and the orthotolidine method, but the former method is based on the fact that DPD is oxidized by chlorine. This method measures the residual chlorine concentration by colorimetrically measuring the red color concentration, since orthotolidine produces yellow holoquinone in the presence of chlorine. This method measures the residual chlorine concentration by
然し乍ら、上記従来例においては、発色した赤
色濃度若しくは黄色濃度を比色測定する比色法を
用いて残留塩素の定量を行なうため、被測定液を
くみあげて専用容器に入れ、試薬を添加して後反
応する時間を待ち発色した液をカバーガラス等の
標準色と比較するといつた煩雑な作業と長い時間
とを必要としていた。 However, in the above conventional example, in order to quantify residual chlorine using a colorimetric method that measures the developed red or yellow concentration colorimetrically, the liquid to be measured is pumped up and placed in a special container, and a reagent is added. Waiting for post-reaction time and comparing the colored solution with the standard color of a cover glass, etc. requires complicated work and a long time.
本発明は、かかる欠点に鑑みてなされたもので
あり、その目的は、煩雑な作業を要することなく
簡単な作業で迅速に被測定液中の残留塩素濃度を
測定する残留塩素測定方法および測定装置を提供
するにある。 The present invention has been made in view of these drawbacks, and its purpose is to provide a residual chlorine measuring method and a measuring device for quickly measuring the residual chlorine concentration in a liquid to be measured with simple work without requiring complicated work. is to provide.
本発明の特徴は、被測定液中の残留塩素濃度を
測定する残留塩素測定方法および測定装置におい
て、被測定液が所定の流量で流れる流路に、ヨウ
化カリウムを素焼の筒等を通して連続的に供給
し、残留塩素とヨウ化カリウムが反応して生じた
ヨウ素に関する電解電流を流通型電極を用いて検
出することにより、被測定液中の残留塩素を測定
することにある。 A feature of the present invention is that in a residual chlorine measuring method and a measuring device for measuring the residual chlorine concentration in a liquid to be measured, potassium iodide is continuously passed through a clay tube or the like into a channel through which the liquid to be measured flows at a predetermined flow rate. The purpose is to measure the residual chlorine in the liquid to be measured by supplying it to the liquid and detecting the electrolytic current related to iodine generated by the reaction between the residual chlorine and potassium iodide using a flow-through electrode.
以下、本発明について図を用いて詳細に説明す
る。第１図は、本発明の一実施例を示す構成説明
図であり、図中、１は液槽、２は被測定液、３，
３′，４，４′はシリコーンゴム等でなるドーナツ
型の栓、５は素焼筒、６はガラス等でなる筒状部
材、７はヨウ化カリウムと酢酸等の混合溶液、８
はヨウ化カリウムの結晶、９はガラス等でなる管
状部材、１０，１０′は白金等でなる電極、１１
は定電圧電源、１２は検流計、１３は流量調節弁
である。同図において、液槽１内の被測定液２
は、流量調節弁１３により設定された所定の流量
となつて素焼筒５や管状部材９等で構成されてい
る流路を流れる。一方、栓４，４′、素焼筒５の
外壁面、および筒状部材６の内壁面で形成される
空洞部には、混合溶液７と結晶８とが入れられて
いるため、該混合溶液７はヨウ化カリウムの飽和
溶液となつており、素焼筒５の内側を流れる被測
定液との間にヨウ化カリウムに関して濃度勾配を
生じ、該被測定液の方へ素焼筒５を通してヨウ化
カリウムが溶出する。而して、素焼筒５の内側に
おいて、所定の流量となつて流れている被測定液
に素焼筒５を通して溶出したヨウ化カリウムが混
入すると、被測定液中の残留塩素とヨウ化カリウ
ムが直ちに反応して遊離のヨウ素を生ずる。該遊
離ヨウ素は、電極１０，１０′が装着されている
管状部材９の中を被測定液等が通過する間に、陰
極・陽極において下式(1)、(2)のような反応をおこ
し、電解電流を生ぜしめる。該電解電流
（陰極） I2＋2K+＋2e →2KI ……(1)
（陽極） 2I-−2e →I2 ……(2)
は、電極１０，１０′に定電圧電源１１とともに
接続されている検流計１２で検出される。尚、電
極１０，１０′は、陰極が上流側、陽極が下流側
となるように装着されており、陽極において発生
したヨウ素の値が残留塩素とヨウ化カリウムとの
反応で発生したヨウ素の真の値に加算されて大き
な誤差を生ずる危険性を防いでいる。 Hereinafter, the present invention will be explained in detail using figures. FIG. 1 is a configuration explanatory diagram showing one embodiment of the present invention, in which 1 is a liquid tank, 2 is a liquid to be measured, 3,
3', 4, 4' are donut-shaped plugs made of silicone rubber, etc., 5 is an unglazed cylinder, 6 is a cylindrical member made of glass, etc., 7 is a mixed solution of potassium iodide and acetic acid, etc., 8
is a potassium iodide crystal, 9 is a tubular member made of glass or the like, 10 and 10' are electrodes made of platinum or the like, 11
12 is a galvanometer, and 13 is a flow control valve. In the figure, the liquid to be measured 2 in the liquid tank 1
flows at a predetermined flow rate set by the flow rate control valve 13 through a flow path made up of the unglazed cylinder 5, the tubular member 9, and the like. On the other hand, the mixed solution 7 and crystals 8 are contained in the cavity formed by the plugs 4, 4', the outer wall surface of the unglazed tube 5, and the inner wall surface of the cylindrical member 6. is a saturated solution of potassium iodide, and a concentration gradient of potassium iodide is generated between it and the liquid to be measured flowing inside the unglazed cylinder 5, and potassium iodide is passed through the unglazed cylinder 5 toward the liquid to be measured. Elute. Therefore, when potassium iodide eluted through the clay tube 5 mixes with the liquid to be measured flowing at a predetermined flow rate inside the clay tube 5, the residual chlorine and potassium iodide in the liquid to be measured are immediately removed. Reacts to produce free iodine. The free iodine causes reactions as shown in equations (1) and (2) below at the cathode and anode while the liquid to be measured passes through the tubular member 9 to which the electrodes 10 and 10' are attached. , giving rise to an electrolytic current. The electrolytic current (cathode) I 2 +2K + +2e →2KI ...(1) (anode) 2I - -2e →I 2 ...(2) is connected to the electrodes 10 and 10' together with the constant voltage power supply 11. It is detected by the galvanometer 12. The electrodes 10 and 10' are installed so that the cathode is on the upstream side and the anode is on the downstream side, so that the value of iodine generated at the anode is the true value of iodine generated by the reaction between residual chlorine and potassium iodide. This prevents the risk of being added to the value of , resulting in a large error.
第２図は、前記管状部材９の中に被測定液が一
定流量で流れる流通時間と電極１０，１０′で検
出されるヨウ素の電解電流値との関係を示す特性
曲線図であつて、前記被測定液２中の残留塩素濃
度が1ppmの場合を例示したものである。第２図
から、管状部材９の中に流れる被測定液の流量を
一定に保つと、ヨウ素の電解電流値は短時間で安
定することが分る。 FIG. 2 is a characteristic curve diagram showing the relationship between the flow time during which the liquid to be measured flows at a constant flow rate in the tubular member 9 and the electrolytic current value of iodine detected by the electrodes 10, 10'. This example shows a case where the residual chlorine concentration in the liquid to be measured 2 is 1 ppm. From FIG. 2, it can be seen that if the flow rate of the liquid to be measured flowing into the tubular member 9 is kept constant, the iodine electrolytic current value becomes stable in a short time.
また、第３図は、前記管状部材９の中を流れる
被測定液の流量を変化させた場合について、前記
被測定液２中の残留塩素濃度とヨウ素の電解電流
値との関係を示す特性曲線図であつて、被測定液
の流量が夫々20ml／min、40ml／min、60ml／
min.の場合を例示したものである。第３図か
ら、管状部材９の中を流れる被測定液の流量が一
定に保たれると、前記被測定液中の残留塩素濃度
とヨウ素の電解電流値が比例関係を示し、ヨウ素
の電解電流値を測定することによつて被測定液中
の残留塩素濃度を測定できることが分る。 Further, FIG. 3 shows a characteristic curve showing the relationship between the residual chlorine concentration in the liquid to be measured 2 and the electrolytic current value of iodine when the flow rate of the liquid to be measured flowing through the tubular member 9 is changed. In the figure, the flow rate of the liquid to be measured is 20ml/min, 40ml/min, and 60ml/min, respectively.
This is an example of the case of min. From FIG. 3, when the flow rate of the liquid to be measured flowing through the tubular member 9 is kept constant, the residual chlorine concentration in the liquid to be measured and the electrolytic current value of iodine show a proportional relationship, and the electrolytic current value of iodine shows a proportional relationship. It can be seen that the residual chlorine concentration in the liquid to be measured can be measured by measuring the value.
第４図および第５図は、本発明の他の実施例を
示す構成説明図であり、図中、１４は定流量ポン
プ、１５，１８は液槽、１７，２０はオーバーフ
ロー管、１６，１９は被測定液である。尚、第４
図および第５図において、第１図と同一符号は同
一意味と同一機能をもたせて使用し、ここでの説
明は省略する。第４図において、定流量ポンプ１
４は、液槽１内の被測定液２を所定の流量で、素
焼筒５や管状部材９等で構成される流路へ連続的
に供給する役割を果している。また、第５図にお
いて、オーバーフロー管１７，２０は夫々液槽１
５，１８内の被測定液１６，１９について液位を
所定の値に保つ役割を果しており、被測定液１
６，１９の液位が一定に保たれることにより、素
焼筒５や管状部材９等で構成される流路を流れる
被測定液の流量は一定に保たれている。 4 and 5 are configuration explanatory diagrams showing other embodiments of the present invention, in which 14 is a constant flow pump, 15, 18 are liquid tanks, 17, 20 are overflow pipes, 16, 19 is the liquid to be measured. Furthermore, the fourth
In the figures and FIG. 5, the same reference numerals as in FIG. 1 have the same meanings and functions, and their explanation will be omitted here. In Figure 4, constant flow pump 1
4 plays the role of continuously supplying the liquid to be measured 2 in the liquid tank 1 at a predetermined flow rate to a flow path constituted by an unglazed tube 5, a tubular member 9, and the like. In addition, in FIG. 5, the overflow pipes 17 and 20 are connected to the liquid tank 1, respectively.
It plays a role in maintaining the liquid level of the liquids to be measured 16 and 19 in the liquids to be measured 16 and 18 at a predetermined value.
By keeping the liquid levels 6 and 19 constant, the flow rate of the liquid to be measured flowing through the channel constituted by the unglazed tube 5, the tubular member 9, etc. is kept constant.
以上、詳しく説明したような本発明の実施例に
よれば、前記素焼筒等５を用いてヨウ化カリウム
を被測定液へ連続的に供給する構成であるため
に、前記従来例に比して、簡単な作業で迅速に被
測定液中の残留塩素濃度を測定することができ
る。また、筒状部材６、素焼筒５、および栓４，
４′で形成される前記空洞部には、ヨウ化カリウ
ム等の混合溶液７とヨウ化カリウムの結晶８が入
れられているので、該結晶８を定期的に補給する
ことによつて混合溶液７を常にヨウ化カリウムの
飽和溶液となすことができ、被測定液中の残留塩
素濃度を連続的に測定する上で極めて好適であ
る。更に、第４図および第５図の実施例において
は、定流量ポンプを使用することにより、被測定
液を連続的に供給でき、プロセス用残留塩素測定
装置として、プロセスサンプル中の残留塩素濃度
を簡単且つ迅速に連続測定することも可能であ
る。 According to the embodiment of the present invention as described above in detail, since potassium iodide is continuously supplied to the liquid to be measured using the clay cylinder etc., compared to the conventional example. , the residual chlorine concentration in the liquid to be measured can be quickly measured with simple operations. Moreover, the cylindrical member 6, the unglazed cylinder 5, and the stopper 4,
The cavity formed by 4' contains a mixed solution 7 of potassium iodide etc. and potassium iodide crystals 8, so by periodically replenishing the crystals 8, the mixed solution 7 can always be made into a saturated solution of potassium iodide, which is extremely suitable for continuously measuring the residual chlorine concentration in the liquid to be measured. Furthermore, in the embodiments shown in FIGS. 4 and 5, the liquid to be measured can be continuously supplied by using a constant flow pump, and the residual chlorine concentration in the process sample can be measured as a process residual chlorine measuring device. It is also possible to carry out continuous measurements simply and quickly.
第１図は、本発明の一実施例を示す構成説明
図、第２図は、被測定液の流通時間とヨウ素の電
解電流値との関係を示す特性曲線図、第３図は、
被測定液中の残留塩素濃度とヨウ素の電解電流値
との関係を示す特性曲線図、第４図および第５図
は、本発明の他の実施例を示す構成説明図であ
る。
１，１５，１８…液槽、２，１６，１９…被測
定液、３，３′，４，４′…栓、５…素焼筒、６…
筒状部材、７…混合溶液、８…結晶、９…管状部
材、１０，１０′…電極、１１…定電圧電源、１
２…検流計、１３…流量調節弁、１４…定流量ポ
ンプ、１７，２０…オーバーフロー管。
FIG. 1 is a configuration explanatory diagram showing one embodiment of the present invention, FIG. 2 is a characteristic curve diagram showing the relationship between the flow time of the liquid to be measured and the electrolytic current value of iodine, and FIG.
Characteristic curve diagrams showing the relationship between the residual chlorine concentration in the liquid to be measured and the electrolytic current value of iodine, and FIGS. 4 and 5 are configuration explanatory diagrams showing other embodiments of the present invention. 1,15,18...Liquid tank, 2,16,19...Measurement liquid, 3,3',4,4'...Plug, 5...Unglazed cylinder, 6...
Cylindrical member, 7... Mixed solution, 8... Crystal, 9... Tubular member, 10, 10'... Electrode, 11... Constant voltage power supply, 1
2... Galvanometer, 13... Flow control valve, 14... Constant flow pump, 17, 20... Overflow pipe.
Claims (1)
ウ化カリウムを素焼の筒を通して連続的に供給
し、前記被測定液中の残留塩素とヨウ化カリウム
が反応して生じたヨウ素に関する電解電流を流通
型電極を用いて検出することにより、被測定液中
の残留塩素を測定することを特徴とする残留塩素
の測定方法。 ２ 被測定液が所定の流量で流れる流路と、該流
路の一部を形成するとともにヨウ化カリウムを濃
度勾配に応じて透過させる素焼の筒と、シリコー
ンゴムからなるドーナツ状の２個の栓および前記
素焼筒の外壁面と協働して所定の内容積を有し所
定の試薬が入れられる空洞部を形成する筒状部材
と、前記素焼筒に接続され前記流路の一部を形成
するとともに白金等でなる電極が装着された管状
部材とを具備し、被測定液中の残留塩素がヨウ化
カリウムと反応して生じたヨウ素に関する電解電
流を前記電極にて検出することにより、被測定液
中の残留塩素を測定することを特徴とする残留塩
素測定装置。[Claims] 1. Potassium iodide is continuously supplied through an unglazed tube to a system in which a liquid to be measured is flowing at a predetermined flow rate, and residual chlorine in the liquid to be measured reacts with potassium iodide. A method for measuring residual chlorine, which comprises measuring residual chlorine in a liquid to be measured by detecting an electrolytic current related to iodine generated by using a flow-through electrode. 2 A channel through which the liquid to be measured flows at a predetermined flow rate, an unglazed tube that forms part of the channel and allows potassium iodide to pass through according to the concentration gradient, and two donut-shaped pieces made of silicone rubber. a cylindrical member that cooperates with the stopper and the outer wall surface of the unglazed tube to form a cavity having a predetermined internal volume and into which a predetermined reagent is placed; and a cylindrical member that is connected to the unglazed tube and forms a part of the flow path. and a tubular member equipped with an electrode made of platinum or the like. A residual chlorine measuring device characterized by measuring residual chlorine in a measurement liquid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55162217A JPS5786038A (en) | 1980-11-18 | 1980-11-18 | Method and apparatus for measuring residual chlorine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55162217A JPS5786038A (en) | 1980-11-18 | 1980-11-18 | Method and apparatus for measuring residual chlorine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5786038A JPS5786038A (en) | 1982-05-28 |
| JPS6258465B2 true JPS6258465B2 (en) | 1987-12-05 |
Family
ID=15750185
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP55162217A Granted JPS5786038A (en) | 1980-11-18 | 1980-11-18 | Method and apparatus for measuring residual chlorine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5786038A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102015111849A1 (en) * | 2015-07-22 | 2017-01-26 | Kuntze Instruments Gmbh | Electrochemical measuring cell for measuring the content of chlorine compounds in water |
-
1980
- 1980-11-18 JP JP55162217A patent/JPS5786038A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5786038A (en) | 1982-05-28 |
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