JPH03113370A - Method for measuring free chlorine - Google Patents
Method for measuring free chlorineInfo
- Publication number
- JPH03113370A JPH03113370A JP1253510A JP25351089A JPH03113370A JP H03113370 A JPH03113370 A JP H03113370A JP 1253510 A JP1253510 A JP 1253510A JP 25351089 A JP25351089 A JP 25351089A JP H03113370 A JPH03113370 A JP H03113370A
- Authority
- JP
- Japan
- Prior art keywords
- chlorine
- measured
- liquid
- free chlorine
- heater
- 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
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 title claims abstract description 65
- 239000000460 chlorine Substances 0.000 title claims abstract description 65
- 229910052801 chlorine Inorganic materials 0.000 title claims abstract description 65
- 238000000034 method Methods 0.000 title claims description 11
- 239000007788 liquid Substances 0.000 claims abstract description 29
- 238000000354 decomposition reaction Methods 0.000 claims abstract description 13
- 239000012670 alkaline solution Substances 0.000 claims description 8
- 239000003153 chemical reaction reagent Substances 0.000 abstract description 4
- 238000005259 measurement Methods 0.000 description 6
- QDHHCQZDFGDHMP-UHFFFAOYSA-N Chloramine Chemical compound ClN QDHHCQZDFGDHMP-UHFFFAOYSA-N 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
- 230000001954 sterilising effect Effects 0.000 description 2
- 241000218691 Cupressaceae Species 0.000 description 1
- 229910021607 Silver chloride Inorganic materials 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- QWPPOHNGKGFGJK-UHFFFAOYSA-N hypochlorous acid Chemical compound ClO QWPPOHNGKGFGJK-UHFFFAOYSA-N 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- HKZLPVFGJNLROG-UHFFFAOYSA-M silver monochloride Chemical compound [Cl-].[Ag+] HKZLPVFGJNLROG-UHFFFAOYSA-M 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〈産業上の利用分野〉
本発明は、遊離塩素の測定方法に関し、更に詳しくは、
残留塩素計におけるＰＨ値と温度を調整して結合塩素分
解後の遊離塩素濃度を求める測定方法に関する。[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a method for measuring free chlorine, and more specifically,
This invention relates to a measurement method for determining the free chlorine concentration after combined chlorine decomposition by adjusting the pH value and temperature in a residual chlorine meter.
〈従来の技術〉
通常、浄水場等において河川の水等を殺菌処理するため
に塩素注入が行われるが、該水の中にアンモニア性窒素
が存在する場合には、このアンモニア性窒素が注入され
た塩素と反応して結合塩素と呼ばれる化合物が生成する
。尚、この結合塩素はクロラミンと呼ばれている。また
、遊離塩素として次亜塩素酸ＨＣｌ０のような遊離塩素
と、モノクロラミンＮＨ２Ｃｌのような結合塩素とが共
存する。しかし、遊離塩素と結合塩素とは殺菌力に差が
あり、殺菌に効果のある遊離塩素のみを検出することが
要求される。<Prior art> Chlorine is usually injected into water treatment plants to sterilize river water, etc., but if ammonia nitrogen is present in the water, this ammonia nitrogen is injected. A compound called combined chlorine is produced by reacting with chlorine. Note that this combined chlorine is called chloramine. Further, as free chlorine, free chlorine such as hypochlorous acid HCl0 and combined chlorine such as monochloramine NH2Cl coexist. However, there is a difference in sterilizing power between free chlorine and combined chlorine, and it is required to detect only free chlorine, which is effective for sterilizing.
ところで、結合塩素を含むサンプル中に適量の塩素を注
入すると、結合塩素が分解して！１離塩素だけが残る。By the way, if you inject an appropriate amount of chlorine into a sample containing combined chlorine, the combined chlorine will decompose! Only chlorine remains.
この分解反応はＰＨ値や温度などの影響を受けるため瞬
時に完了するものではなく、塩素注入後ただちに遊離塩
素を測定しても、ＰＨ値や温度が低いような場合には反
応が終了していないことがある。このため、反応途中で
遊離塩素の濃度を測定しても、その測定値は反応完了時
の測定値と一致せず、結合塩素が残留していることと相
まち遊離塩素を正確に測定することが困器であるという
欠点があった。This decomposition reaction is affected by pH value and temperature, so it does not complete instantly; even if you measure free chlorine immediately after chlorine injection, if the pH value or temperature is low, the reaction has not finished. Sometimes there isn't. For this reason, even if the concentration of free chlorine is measured during the reaction, the measured value will not match the measured value at the completion of the reaction, and combined with the fact that bound chlorine remains, it is difficult to accurately measure free chlorine. The disadvantage was that it was difficult to use.
〈発明が解決しようとする問題点〉
本発明の解決しようとする技術的課題は、結合塩素の分
解反応を完了させ、その後、被測定液を残留塩素計に取
込んで遊離塩素を正確に測定できるような遊離塩素の測
定方法を提供することにある。 く問題点を解決するた
めの手段〉上述のような問題点を解決する本発明の特徴
は、ポーラログラフ法により遊離塩素と結合塩素とが共
存する被測定液中の遊離塩素濃度を測定する遊離塩素の
測定方法において、被測定液にアルカリ溶液を加えてＰ
Ｈ９〜１０としてのち加温器で２０〜３０℃に温度調節
することにより結合塩素の分解反応を完了させ、その後
、残留塩素計で遊離塩素を測定することにある。<Problem to be solved by the invention> The technical problem to be solved by the invention is to complete the decomposition reaction of combined chlorine, and then introduce the liquid to be measured into a residual chlorine meter to accurately measure free chlorine. The object of the present invention is to provide a method for measuring free chlorine. Means for Solving the Problems> The feature of the present invention that solves the above problems is that the free chlorine concentration in a liquid to be measured in which free chlorine and combined chlorine coexist is measured by a polarographic method. In the measurement method, an alkaline solution is added to the liquid to be measured and P
The purpose is to complete the decomposition reaction of combined chlorine by adjusting the temperature to 20 to 30° C. with a heater after setting H9 to 10, and then measuring free chlorine with a residual chlorine meter.
く作用〉
送液ポンプが駆動すると、槽内の被測定液は、合流点→
加温器→送液ポンプ→合流点を通って測定槽の導入口に
至り、槽内のアルカリ溶液は、ポンプ→合流点→加温器
→送液ポンプ→合流点を通って測定槽の導入口に至り、
槽内の試薬は、ポンプ→合流点を通って測定槽の導入口
に至る。また、合流点では被測定液がアルカリ溶液と混
合されてＰＨ値が９〜１０となり、その後、加温器によ
って２０〜３０℃程度に暖められる。このようにＰＨ値
と温度が調節されることにより、結合塩素の分解反応が
進行し、被測定液が合流点に達する頃には、結合塩素の
分解反応が完全に終了するようになる。When the liquid pump is driven, the liquid to be measured in the tank flows from the confluence point to
The alkaline solution in the tank passes through the warmer → liquid feed pump → confluence point and reaches the inlet of the measurement tank. reaching the mouth,
The reagent in the tank passes from the pump to the confluence point and reaches the inlet of the measurement tank. Further, at the confluence point, the liquid to be measured is mixed with an alkaline solution to have a pH value of 9 to 10, and then heated to about 20 to 30°C by a heater. By adjusting the pH value and temperature in this manner, the decomposition reaction of the combined chlorine progresses, and by the time the liquid to be measured reaches the confluence point, the decomposition reaction of the combined chlorine is completely completed.
〈実施例〉 以下、図面に従い本発明の測定方法を詳細に説明する。<Example> Hereinafter, the measuring method of the present invention will be explained in detail with reference to the drawings.
第１図は本発明の測定方法を実施する為に使用された遊
離塩素測定装置の構成説明図であり、図中、１は被測定
液、２は例えばＮａＯＨ等のアルカリ溶液を貯留する槽
、３は試薬を貯留する槽、４ａ〜４ｃは送液ポンプ、５
は導入口５ａ及び排出口５ｂを持つ測定槽、６は指示極
としての回転金電極、７は比較極としての銀・塩化銀電
極、８はポーラログラフや信号処理回路でなる検出部、
９は合流点、１０は加温器である。FIG. 1 is an explanatory diagram of the configuration of a free chlorine measuring device used to carry out the measuring method of the present invention. In the figure, 1 is a liquid to be measured, 2 is a tank for storing an alkaline solution such as NaOH, 3 is a tank for storing reagents, 4a to 4c are liquid pumps, 5
1 is a measurement tank having an inlet 5a and an outlet 5b, 6 is a rotating gold electrode as an indicator electrode, 7 is a silver/silver chloride electrode as a comparison electrode, 8 is a detection unit consisting of a polarograph or a signal processing circuit,
9 is a confluence point, and 10 is a warmer.
このような構成からなる遊離塩素測定装置において、送
液ポンプ４ａ〜４Ｃが駆動すると、槽１内の被測定液は
、合流点９ａ→加温器１０→送液ポンプ４Ｃ→合流点９
ｂを通って測定槽５の導入口５ａに至り、槽２内のアル
カリ溶液は、ポンプ４ａ→合流点９ａ→加温器１０→送
液ポンプ４Ｃ→合流点９ｂを通って測定槽５の導入口５
ａに至り、檜３内の試薬は、ポンプ４ｂ→合流点９ｂを
通って測定槽５の導入口５ａに至る。また、合流点９ａ
では被測定液がアルカリ溶液と混合されてＰＨ値が９〜
１０となり、その後、加温器１０によって２０〜３０’
Ｃ程度に暖められる。このようにＰＨ値と温度が調節さ
れることにより、結合塩素の分解反応が進行し、被測定
液が合流点りｂに達する頃には、結合塩素の分解反応が
完全に終了するようになる。その後、該被測定液を残留
塩素計で測定すると遊離塩素が正確に測定されるように
なる。In the free chlorine measuring device having such a configuration, when the liquid feed pumps 4a to 4C are driven, the liquid to be measured in the tank 1 is transferred from the confluence point 9a to the warmer 10 to the liquid feed pump 4C to the confluence point 9.
b to the inlet 5a of the measurement tank 5, and the alkaline solution in the tank 2 is introduced into the measurement tank 5 through the pump 4a→merging point 9a→warmer 10→liquid pump 4C→merging point 9b. Mouth 5
a, the reagent in the cypress 3 passes through the pump 4b→confluence point 9b and reaches the inlet 5a of the measurement tank 5. Also, confluence point 9a
In this case, the liquid to be measured is mixed with an alkaline solution and the pH value is 9~9.
10, and then 20~30' by the warmer 10.
It can be heated to about C. By adjusting the pH value and temperature in this way, the decomposition reaction of combined chlorine progresses, and by the time the liquid to be measured reaches confluence point b, the decomposition reaction of combined chlorine is completely completed. . Thereafter, when the liquid to be measured is measured with a residual chlorine meter, free chlorine can be accurately measured.
〈発明の効果〉
本発明によれば、ポーラログラフ法により遊離塩素と結
合塩素とが共存する被測定液中の遊離塩素濃度を測定す
る遊離塩素の測定方法において、被測定液にアルカリ溶
液を加えてＰＨ９〜１ｏとしてのち加温器で２０〜３０
’Ｃに温度調節することにより結合塩素の分解反応を完
了させ、その後、残留塩素計で遊離塩素を測定するよう
に構成したため、ＰＨ値や温度が低い場合であっても、
結合塩素が分解した後の遊離塩素濃度を正確に測定でき
る等の利点がある。<Effects of the Invention> According to the present invention, in a method for measuring free chlorine in which the concentration of free chlorine in a liquid to be measured in which free chlorine and combined chlorine coexist is measured by a polarographic method, an alkaline solution is added to the liquid to be measured. PH9-1o and then 20-30 with a warmer
The decomposition reaction of combined chlorine is completed by adjusting the temperature to 'C, and then free chlorine is measured with a residual chlorine meter, so even when the pH value or temperature is low,
It has the advantage of being able to accurately measure the free chlorine concentration after the combined chlorine is decomposed.
図は本発明方法を実施する為に使用される遊離塩素測定
装置の構成説明図である。The figure is an explanatory diagram of the configuration of a free chlorine measuring device used to carry out the method of the present invention.
Claims (1)
る被測定液中の遊離塩素濃度を測定する遊離塩素の測定
方法において、被測定液にアルカリ溶液を加えてＰＨ９
〜１０としてのち加温器で２０〜３０℃に温度調節する
ことにより結合塩素の分解反応を完了させ、その後、残
留塩素計で遊離塩素を測定することを特徴とする遊離塩
素測定方法。In a method for measuring free chlorine, in which the free chlorine concentration in a liquid to be measured in which free chlorine and combined chlorine coexist is measured by the polarographic method, an alkaline solution is added to the liquid to be measured to reach a pH of 9.
- 10 and then adjusting the temperature to 20 to 30° C. with a heater to complete the decomposition reaction of combined chlorine, and then measuring free chlorine with a residual chlorine meter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1253510A JP2705247B2 (en) | 1989-09-28 | 1989-09-28 | How to measure free chlorine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1253510A JP2705247B2 (en) | 1989-09-28 | 1989-09-28 | How to measure free chlorine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03113370A true JPH03113370A (en) | 1991-05-14 |
| JP2705247B2 JP2705247B2 (en) | 1998-01-28 |
Family
ID=17252378
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1253510A Expired - Fee Related JP2705247B2 (en) | 1989-09-28 | 1989-09-28 | How to measure free chlorine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2705247B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2778463A1 (en) * | 1998-05-06 | 1999-11-12 | Sagem | Automatic system for controlling the chlorine content of water e.g. in swimming pools |
| EP2250484A1 (en) * | 2008-02-28 | 2010-11-17 | Watkins Manufacturing Corporation | Spa chlorine measurement via temperature shift uv spectrometry |
| WO2022240293A1 (en) * | 2021-05-12 | 2022-11-17 | Searas As | System and process for measuring of a gas dissolved in a liquid |
-
1989
- 1989-09-28 JP JP1253510A patent/JP2705247B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2778463A1 (en) * | 1998-05-06 | 1999-11-12 | Sagem | Automatic system for controlling the chlorine content of water e.g. in swimming pools |
| EP2250484A1 (en) * | 2008-02-28 | 2010-11-17 | Watkins Manufacturing Corporation | Spa chlorine measurement via temperature shift uv spectrometry |
| EP2250484A4 (en) * | 2008-02-28 | 2013-11-06 | Watkins Mfg Corp | Spa chlorine measurement via temperature shift uv spectrometry |
| WO2022240293A1 (en) * | 2021-05-12 | 2022-11-17 | Searas As | System and process for measuring of a gas dissolved in a liquid |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2705247B2 (en) | 1998-01-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |