JPH02296145A - How to measure chlorite ion - Google Patents
How to measure chlorite ionInfo
- Publication number
- JPH02296145A JPH02296145A JP1116289A JP11628989A JPH02296145A JP H02296145 A JPH02296145 A JP H02296145A JP 1116289 A JP1116289 A JP 1116289A JP 11628989 A JP11628989 A JP 11628989A JP H02296145 A JPH02296145 A JP H02296145A
- Authority
- JP
- Japan
- Prior art keywords
- electrode
- chlorite ions
- current
- electrodes
- sample liquid
- 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.)
- Granted
Links
- QBWCMBCROVPCKQ-UHFFFAOYSA-M chlorite Chemical compound [O-]Cl=O QBWCMBCROVPCKQ-UHFFFAOYSA-M 0.000 title claims description 8
- 229940005993 chlorite ion Drugs 0.000 title claims description 8
- -1 chlorite ions Chemical class 0.000 claims abstract description 34
- 229910001919 chlorite Inorganic materials 0.000 claims abstract description 33
- 229910052619 chlorite group Inorganic materials 0.000 claims abstract description 33
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 3
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 3
- 229910000510 noble metal Inorganic materials 0.000 claims abstract 2
- 230000003647 oxidation Effects 0.000 claims description 17
- 238000007254 oxidation reaction Methods 0.000 claims description 17
- 239000012488 sample solution Substances 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 14
- 239000010931 gold Substances 0.000 claims description 5
- 229910052709 silver Inorganic materials 0.000 claims description 4
- 239000004332 silver Substances 0.000 claims description 4
- 229910052737 gold Inorganic materials 0.000 claims description 3
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 2
- 150000002500 ions Chemical class 0.000 claims description 2
- HKZLPVFGJNLROG-UHFFFAOYSA-M silver monochloride Chemical compound [Cl-].[Ag+] HKZLPVFGJNLROG-UHFFFAOYSA-M 0.000 claims description 2
- 229910021607 Silver chloride Inorganic materials 0.000 claims 1
- 229910021397 glassy carbon Inorganic materials 0.000 claims 1
- 239000007788 liquid Substances 0.000 abstract description 10
- 238000005868 electrolysis reaction Methods 0.000 abstract description 6
- 230000001590 oxidative effect Effects 0.000 abstract description 6
- 239000003792 electrolyte Substances 0.000 abstract description 5
- 238000005259 measurement Methods 0.000 abstract description 4
- 239000003153 chemical reaction reagent Substances 0.000 abstract description 2
- OSVXSBDYLRYLIG-UHFFFAOYSA-N dioxidochlorine(.) Chemical compound O=Cl=O OSVXSBDYLRYLIG-UHFFFAOYSA-N 0.000 description 34
- 239000004155 Chlorine dioxide Substances 0.000 description 17
- 235000019398 chlorine dioxide Nutrition 0.000 description 17
- 230000000694 effects Effects 0.000 description 6
- 239000000523 sample Substances 0.000 description 5
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 description 4
- 229910052740 iodine Inorganic materials 0.000 description 4
- 239000011630 iodine Substances 0.000 description 4
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 3
- 238000004448 titration Methods 0.000 description 3
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 2
- 229910052801 chlorine Inorganic materials 0.000 description 2
- 239000000460 chlorine Substances 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000009182 swimming Effects 0.000 description 2
- 239000008399 tap water Substances 0.000 description 2
- 235000020679 tap water Nutrition 0.000 description 2
- 101100282687 Caenorhabditis elegans gfi-3 gene Proteins 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004061 bleaching Methods 0.000 description 1
- 239000007844 bleaching agent Substances 0.000 description 1
- 230000000711 cancerogenic effect Effects 0.000 description 1
- 231100000315 carcinogenic Toxicity 0.000 description 1
- JFBJUMZWZDHTIF-UHFFFAOYSA-N chlorine chlorite Inorganic materials ClOCl=O JFBJUMZWZDHTIF-UHFFFAOYSA-N 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 239000010970 precious metal Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 230000001954 sterilising effect Effects 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、試料液中の亜塩素酸イオン（（１！１０
）を連続的に測定する方法に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a method for reducing chlorite ions ((1!10
).
従来から上水やプールの殺菌に塩素が使用されているが
、塩素から発癌性のトリハロメタンが生成することが判
り問題となっている。Chlorine has traditionally been used to disinfect tap water and swimming pools, but it has become a problem as it has been found that chlorine produces carcinogenic trihalomethanes.
そこで最近では、トリハロメタンを生成しない二酸化塩
素を用い、その酸化力による殺菌作用を利用して上水や
プールの殺菌が検封されている。Recently, chlorine dioxide, which does not produce trihalomethane, has been used to test the sterilization of tap water and swimming pools by utilizing its oxidizing power to sterilize water.
このように二酸化塩素を酸化剤として使用する場合、二
酸化塩素そのものは還元されるが、一部は亜塩素酸イオ
ンとなる。亜塩素酸イオンは光や紫外線により分解して
二酸化塩素となり、又酸性にすると二酸化塩素を生成す
る。繊維の漂白には亜塩素酸イオンが使用されるが、こ
れは亜塩素酸イオンを酸性にして生じる二酸化塩素の漂
白作用を利用したものである。When chlorine dioxide is used as an oxidizing agent in this way, chlorine dioxide itself is reduced, but a portion becomes chlorite ions. Chlorite ions decompose into chlorine dioxide when exposed to light or ultraviolet light, and when acidified, chlorine dioxide is produced. Chlorite ions are used to bleach fibers, and this utilizes the bleaching action of chlorine dioxide, which is produced by acidifying chlorite ions.
上記の如く、亜塩素酸イオンは二酸化塩素の酸化能を潜
在的に有するものであり、従って上記分解等においては
二酸化塩素の濃度管理だけでなく、亜塩素酸イオンの濃
度管理も同時に行なうことによって、試料のもつ酸化能
の必要且つ充分な管理を行なうことが出来る。As mentioned above, chlorite ions have the potential to oxidize chlorine dioxide, and therefore, in the above decomposition, etc., it is necessary to control not only the concentration of chlorine dioxide but also the concentration of chlorite ions at the same time. , it is possible to perform necessary and sufficient control of the oxidizing ability of the sample.
ところで、溶存二酸化塩齋の測定法としては、ヨウ素滴
定法（化学防災指針（７））と、隔膜形ボー・シログラ
フ電極法（特開昭５４−１２５０９５号公報）が知られ
ている。又、亜塩素酸イオンの測定法としては、ヨウ素
滴定法（化学防災指針（力）のみがある。By the way, as methods for measuring dissolved salt dioxide, the iodine titration method (Chemical Disaster Prevention Guidelines (7)) and the diaphragm-type Beau-Silograph electrode method (Japanese Unexamined Patent Publication No. 125095/1982) are known. In addition, the only method for measuring chlorite ions is the iodine titration method (Chemical Disaster Prevention Guidelines).
しかし上記の亜塩素酸イオンの測定法は、試料液を酸性
にして二酸化塩素を生成させ、これをヨウ素で置換して
滴定する間接的な測定方法であり、試料液中に同時に含
まれる二酸化塩素を分離して亜塩素酸イオンだけを測定
することが出来ない。However, the above method for measuring chlorite ions is an indirect measurement method in which the sample solution is made acidic to generate chlorine dioxide, which is then replaced with iodine and titrated. It is not possible to separate the chlorite ion and measure only the chlorite ion.
しかも、ヨウ素滴定法は間欠測定であって、連続的な濃
度管理には不適当である。Moreover, the iodine titration method is an intermittent measurement method, and is not suitable for continuous concentration control.
〔発明が解決しようとする課題〕
本発明はかかる従来の事情に鑑み、試料液中に二酸化塩
素が共存する場合でも亜塩素酸イオンのみの定量ができ
、しかも連続測定が可能である亜塩素酸イオンの測定方
法を提供することを目的とする。[Problems to be Solved by the Invention] In view of the above-mentioned conventional circumstances, the present invention has been developed to produce a chlorite ion that can quantify only chlorite ions even when chlorine dioxide coexists in a sample solution, and can be continuously measured. The purpose of this invention is to provide a method for measuring ions.
上記の目的を達成するために、本発明の亜塩素酸イオン
の測定方法では、試料液中に作用電極と対極の２極又は
作用電極と参照電極と対極の３極を浸漬し、貴金属又は
炭素からなる作用電極を試料液に対し相対的に動かしな
がら、２極の場合は対極を基準に又３極の場合は参照電
極を基準にして亜塩素酸イオンの酸化電流を生じる電圧
を作用電極に印加し、発生する酸化電流を測定して試料
液中の亜塩素酸イオン濃度を求めることを特徴とする。In order to achieve the above object, in the method for measuring chlorite ions of the present invention, two electrodes, a working electrode and a counter electrode, or three electrodes, a working electrode, a reference electrode, and a counter electrode, are immersed in a sample solution. While moving the working electrode consisting of a The chlorite ion concentration in the sample liquid is determined by applying an oxidation current and measuring the generated oxidation current.
本発明は、試料液中の亜塩素酸イオンが印加電圧の如何
によっては電解され、電解電流を発生するとの知見に基
すき為されたものである。即ち、本発明方法は試料液自
体を電解液として直接電解し、亜塩素酸イオンの電解に
より発生する電流を測定するものであって、亜塩素酸イ
オンの電解の場合には酸化電流が発生する。The present invention was developed based on the knowledge that chlorite ions in a sample solution are electrolyzed depending on the applied voltage and generate an electrolytic current. That is, the method of the present invention directly electrolyzes the sample solution itself as an electrolyte and measures the current generated by electrolysis of chlorite ions, and in the case of electrolysis of chlorite ions, an oxidation current is generated. .
この酸化電流は試料液中に溶存する亜塩素酸イオンの濃
度に比例するので、亜塩素酸イオン濃度と酸化電流の値
との関係を予め求めておけば、供給した試料液における
酸化電流を測定することによって、試料液中の亜塩素酸
イオンの濃度を知ることが出来る。This oxidation current is proportional to the concentration of chlorite ions dissolved in the sample solution, so if the relationship between the chlorite ion concentration and the oxidation current value is determined in advance, the oxidation current in the supplied sample solution can be measured. By doing this, the concentration of chlorite ions in the sample solution can be determined.
尚、試料液中に亜塩素酸イオンと共に二酸化塩素が溶存
する場合でも、二酸化塩素の電解により還元電流が発生
する電圧領域は、亜塩素酸イオンの酸化電流を発生させ
る電圧領域と異なるので、印加する電圧を適当に選択す
ることによって、二酸化塩素の影響を受けることなく亜
塩素酸イオンのみを測定することが可能である。Note that even if chlorine dioxide is dissolved together with chlorite ions in the sample solution, the voltage range where a reduction current is generated due to electrolysis of chlorine dioxide is different from the voltage range where an oxidation current of chlorite ions is generated, so the applied By appropriately selecting the voltage, it is possible to measure only chlorite ions without being affected by chlorine dioxide.
本発明方法は上記の如く電解を利用した方法であるから
、長期間測定を続けると作用！極の表面に酸化物の生成
による汚れが付着して発生電流値の低下をもたらすので
、このような場合には作朋電極表面をブラシやガラスピ
ーズ等でこすって、新しい表面を保つようにする必要が
ある。Since the method of the present invention uses electrolysis as described above, it will work if the measurement is continued for a long period of time! Dirt due to the formation of oxides adheres to the surface of the electrode, resulting in a decrease in the generated current value, so in such cases, the surface of the electrode should be rubbed with a brush or glass beads to maintain a fresh surface. There is a need.
本発明方法を実施するための測定装置の具体例を第１図
及び第４図から第６図に示した。A specific example of a measuring device for implementing the method of the present invention is shown in FIG. 1 and FIGS. 4 to 6.
第１図は測定槽１に供給される試料液２に、棒状絶縁物
表面に形成した作用電極３と対極４とを浸漬した２極に
よる測定装置であり、作用電極３を回転させることによ
り試料液２に対して動かしながら、作用電極３に印加し
た電圧により発生する酸化電流を電流計６で測定するよ
うになっている。第４図は対極４として市販の参照電極
を用いた２極による測定装置である。FIG. 1 shows a two-pole measuring device in which a working electrode 3 and a counter electrode 4 formed on the surface of a rod-shaped insulator are immersed in a sample liquid 2 supplied to a measuring tank 1. While moving the liquid 2, the oxidation current generated by the voltage applied to the working electrode 3 is measured with an ammeter 6. FIG. 4 shows a two-pole measuring device using a commercially available reference electrode as the counter electrode 4.
第５図は電流を流す電極と電位を規制するＴＬ極を分離
した３極による測定装置の例であり、通常は電位を規制
する電極として市販の参照電極５を使用し且つ電流を流
す作用電極３には貴金属を使用する。又、第５図の測定
装置では、電圧の印加と発生する酸化電流の測定をポテ
ンショスタット７を用いて行なっている。Figure 5 is an example of a three-pole measuring device in which an electrode for passing current and a TL pole for regulating potential are separated.Usually, a commercially available reference electrode 5 is used as the electrode for regulating potential, and a working electrode for passing current is used. 3 uses precious metals. Further, in the measuring apparatus shown in FIG. 5, a potentiostat 7 is used to apply voltage and measure the generated oxidation current.
更に第６図は、第１図と同様の２極による測定装置であ
るが、作用電極３と試料液２との相対的な動きをスター
ラーによる試料液２の撹拌により得る例であり、回転す
るスターラーバー８を作用電極３に接触させることによ
り、作用電極３の表面を常時こすって新しい表面を保つ
ようにしたものである。Furthermore, FIG. 6 shows a measuring device using two poles similar to that shown in FIG. By bringing the stirrer bar 8 into contact with the working electrode 3, the surface of the working electrode 3 is constantly rubbed to maintain a fresh surface.
第１図の測定装置において、作用電極３として金（Ａｕ
） 、白金（ｐｔ）又はグラフシーカーボン（ＧＣりを
用い、及び対極４として銀又は銀／塩化銀（ＡｇＣｌ）
を使用して、一定濃度の亜塩素酸イオン（濃度約３０
ｐｐｍ ）と二酸化塩素（濃度約５ｐｐｍ）を含む試料
液（ｐＨ６）に対して作用？ｆｔ ｇＦｉ３への印加電
圧を変化させた場合の加電圧電流特性を第２図に示した
。この場合、作用電極の種類により多少異なるが、印加
電圧が０．６〜１．２ｖの領域で亜塩素酸イオンの拡散
律速に基ずく安定した酸化電流が発生し、印加電圧が＋
０．４ｖ〜−〇、４ｖの領域で二酸化塩素の安定した還
元電流が発生すること、及びこれらの印加電圧領域では
残余電流も小さいことが判る。In the measuring device of FIG. 1, the working electrode 3 is made of gold (Au).
), platinum (pt) or graphy carbon (GC), and silver or silver/silver chloride (AgCl) as the counter electrode 4.
using a constant concentration of chlorite ion (concentration approx. 30
ppm) and chlorine dioxide (concentration approximately 5 ppm)? FIG. 2 shows applied voltage and current characteristics when changing the applied voltage to ft gFi3. In this case, although it varies somewhat depending on the type of working electrode, a stable oxidation current based on the rate-limiting diffusion of chlorite ions occurs in the applied voltage range of 0.6 to 1.2 V, and the applied voltage increases to +
It can be seen that a stable reduction current of chlorine dioxide is generated in the range of 0.4v to -0,4v, and that the residual current is also small in these applied voltage ranges.
又、第３図は上記と同じ測定装置と試料液で印加電圧を
＋０．７５ｖに設定し、試料液のｐＨを変化させた場合
の亜塩素酸イオンの酸化電流と残余電流の変化を示す。Furthermore, FIG. 3 shows changes in the oxidation current and residual current of chlorite ions when the same measuring device and sample solution as above are used, the applied voltage is set to +0.75 V, and the pH of the sample solution is changed.
作用電極としてｐｔを用いた場合には残余電流や還元電
流が大きく変動し、ｐＨの影響が大きいことが判る。作
用電極としてＡｕを用いた場合は残余電流に対するｐＨ
の影響は少ないが、酸化電流に対するｐＨの影響は大き
い。It can be seen that when PT is used as the working electrode, the residual current and reduction current fluctuate greatly, indicating that the influence of pH is large. When using Au as the working electrode, the pH with respect to the residual current
Although the effect of pH on oxidation current is small, the effect of pH on oxidation current is large.
作用電極にＱＣを用いると酸化電流に対するｐＨの影響
は少ないが、残余電流に対する影響が比較的大きい。従
って作用Ｎｗ１としてはａＣかＡｕが好ましいが、いず
れにしてもｐＨの影響を無埠出来ないので試料液のｐＨ
が変動する場合にはｐＨを測定し、測定値を補正するこ
とが測定精度を上げるうえで望ましい。When QC is used as the working electrode, pH has little effect on oxidation current, but has a relatively large effect on residual current. Therefore, aC or Au is preferable as the action Nw1, but in any case, since the influence of pH cannot be eliminated, the pH of the sample solution
When pH fluctuates, it is desirable to measure the pH and correct the measured value in order to improve measurement accuracy.
本発明によれば、亜塩素酸イオンを含む試料液自体を電
解液として電解電流を測定するので、補充や交換が必要
な特別な電解液や試薬などを要せず、従って長期間にわ
たり連続測定が可能な亜塩素酸イオンの測定方法を提供
することが出来る。According to the present invention, since the electrolytic current is measured using the sample solution itself containing chlorite ions as an electrolyte, there is no need for special electrolytes or reagents that need to be replenished or replaced, and therefore continuous measurement can be carried out over a long period of time. A method for measuring chlorite ions can be provided.
又、試料液中に二酸化塩素が共存する場合であっても、
その妨害を受けずに亜塩素酸イオンの測定が可能である
。Furthermore, even if chlorine dioxide coexists in the sample solution,
It is possible to measure chlorite ions without this interference.
第１図は本発明方法の実施に用いる測定装置の一例を示
す概略の断面図であり、第２図は一定濃度の二酸化塩素
と亜塩素酸イオンを介む試料液の加電圧電流特性を示す
グラフであり、第３図は同じ試料液での亜塩素酸イオン
の酸化電流及び残余電流とｐＨの関係を示すグラフであ
る。第４図から第６図は本発明方法の実施に用いる別の
測定装置を示す概略の断面図である。
１・・測定槽 ２・・試料液
３・・作用ｉ！！ ４・・対極５・・参照電極
６・・電流計
７・・ポテンショスタット
８・・スターラーバー
第１図
第４図
出願人 東亜電波工業株式会社
第３図
ｐＨFig. 1 is a schematic cross-sectional view showing an example of a measuring device used to carry out the method of the present invention, and Fig. 2 shows the applied voltage and current characteristics of a sample liquid through constant concentrations of chlorine dioxide and chlorite ions. FIG. 3 is a graph showing the relationship between the oxidation current and residual current of chlorite ions and pH in the same sample solution. 4 to 6 are schematic cross-sectional views showing another measuring device used for carrying out the method of the invention. 1. Measuring tank 2. Sample liquid 3. Action i! ! 4... Counter electrode 5... Reference electrode 6... Ammeter 7... Potentiostat 8... Stirrer bar Figure 1 Figure 4 Applicant Toa Denpa Kogyo Co., Ltd. Figure 3 pH
Claims (2)
参照電極と対極の３極を浸漬し、貴金属又は炭素からな
る作用電極を試料液に対し相対的に動かしながら、２極
の場合は対極を基準に又３極の場合は参照電極を基準に
して亜塩素酸イオンの酸化電流を生じる電圧を作用電極
に印加し、発生する酸化電流を測定して試料液中の亜塩
素酸イオン濃度を求めることを特徴とする亜塩素酸イオ
ンの測定方法。(1) Immerse two electrodes, a working electrode and a counter electrode, or three electrodes, a working electrode, a reference electrode, and a counter electrode, in the sample solution, and move the working electrode made of noble metal or carbon relative to the sample solution. In the case of three electrodes, a voltage that generates an oxidation current of chlorite ions is applied to the working electrode with reference to the counter electrode or in the case of three electrodes, the oxidation current of chlorite ions is measured. A method for measuring chlorite ions characterized by determining ion concentration.
対極に銀又は銀／塩化銀を使用して、対極を基準にして
作用電極に０．６Ｖ〜１．２Ｖの電圧を印加することを
特徴とする、請求項（１）記載の亜塩素酸イオンの測定
方法。(2) Using gold or glassy carbon for the working electrode,
Chlorite ion according to claim (1), characterized in that silver or silver/silver chloride is used as a counter electrode, and a voltage of 0.6 V to 1.2 V is applied to the working electrode with respect to the counter electrode. How to measure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1116289A JPH0746093B2 (en) | 1989-05-10 | 1989-05-10 | Method for measuring chlorite ion |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1116289A JPH0746093B2 (en) | 1989-05-10 | 1989-05-10 | Method for measuring chlorite ion |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02296145A true JPH02296145A (en) | 1990-12-06 |
| JPH0746093B2 JPH0746093B2 (en) | 1995-05-17 |
Family
ID=14683364
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1116289A Expired - Fee Related JPH0746093B2 (en) | 1989-05-10 | 1989-05-10 | Method for measuring chlorite ion |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0746093B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1484606A1 (en) * | 2003-05-21 | 2004-12-08 | ProMinent Dosiertechnik GmbH | Chlorite sensor using a gold electrode |
| EP1739421A1 (en) * | 2005-06-27 | 2007-01-03 | CLR Srl | Electrochemical analyser for the selective measurement of chlorites in water |
| JP2008082853A (en) * | 2006-09-27 | 2008-04-10 | Daiso Co Ltd | Measuring method of concentrations of chlorine dioxide and chlorite ions in aqueous solution and measuring instrument |
-
1989
- 1989-05-10 JP JP1116289A patent/JPH0746093B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1484606A1 (en) * | 2003-05-21 | 2004-12-08 | ProMinent Dosiertechnik GmbH | Chlorite sensor using a gold electrode |
| EP1739421A1 (en) * | 2005-06-27 | 2007-01-03 | CLR Srl | Electrochemical analyser for the selective measurement of chlorites in water |
| JP2008082853A (en) * | 2006-09-27 | 2008-04-10 | Daiso Co Ltd | Measuring method of concentrations of chlorine dioxide and chlorite ions in aqueous solution and measuring instrument |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0746093B2 (en) | 1995-05-17 |
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