JPH0830687B2 - Water quality measurement method - Google Patents
Water quality measurement methodInfo
- Publication number
- JPH0830687B2 JPH0830687B2 JP14412090A JP14412090A JPH0830687B2 JP H0830687 B2 JPH0830687 B2 JP H0830687B2 JP 14412090 A JP14412090 A JP 14412090A JP 14412090 A JP14412090 A JP 14412090A JP H0830687 B2 JPH0830687 B2 JP H0830687B2
- Authority
- JP
- Japan
- Prior art keywords
- solvent
- sample water
- residual chlorine
- channel
- acidic solution
- 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 - Lifetime
Links
Landscapes
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 本発明は浄水場等において残留塩素を検出するための
水質計測方法に関する。TECHNICAL FIELD The present invention relates to a water quality measuring method for detecting residual chlorine in a water purification plant or the like.
従来の技術 従来、浄水場等において浄水中の残留塩素を計測する
方法としては、ポーラログラフ法やDPD比色法がある。
ポーラログラフ法は、試料水中に浸した面積の小さな回
転電極と、面積の大きい非分極性の対極の間に直流電圧
を加えて、回転電極の表面で濃度分極を生じさせ、その
時流れる拡散電流が測定対象物質の濃度に比例すること
を利用したものである。また、DPD比色法は、試料水中
の遊離塩素がpH6.3〜6.6でDPD指示薬を酸化して赤色化
合物を生成し、その赤色の濃さが塩素濃度に比例するこ
とを利用したものである。2. Description of the Related Art Conventionally, there have been polarographic methods and DPD colorimetric methods as methods for measuring residual chlorine in purified water in water purification plants and the like.
In the polarographic method, a DC voltage is applied between a rotating electrode with a small area immersed in sample water and a non-polarizing counter electrode with a large area to cause concentration polarization on the surface of the rotating electrode, and the diffusion current flowing at that time is measured. It is based on the fact that it is proportional to the concentration of the target substance. Further, the DPD colorimetric method utilizes that free chlorine in the sample water oxidizes the DPD indicator at pH 6.3 to 6.6 to produce a red compound, and the red concentration is proportional to the chlorine concentration. .
発明が解決しようとする課題 しかし、ポーラログラフ法は、試料水中に遊離塩素と
ともに共存する鉄イオンやマンガンイオン、さらには試
料水のpH値および電気伝導率によって拡散電流が影響さ
れる問題があった。また、試料水中の遊離塩素を直接電
気還元するために電極が経時とともに劣化する問題があ
った。However, the polarographic method has a problem that the diffusion current is affected by iron ions and manganese ions coexisting with free chlorine in the sample water, and further by the pH value and electric conductivity of the sample water. Further, there is a problem that the electrode deteriorates with time because the free chlorine in the sample water is directly electrically reduced.
そして、DPD比色法においては、試料水中に浮遊物質
や着色物質が共存する場合に赤色の色合いを正確に測定
することができない問題や、連続測定を行うことができ
ない問題があった。In the DPD colorimetric method, there are problems that the hue of red cannot be accurately measured when a floating substance or a coloring substance coexists in the sample water, and that continuous measurement cannot be performed.
本発明は上記課題を解決するもので、試料水の電気伝
導率を測定することによって試料水中の共存物質や浮遊
物質に影響されることなく試料水中に存在する残留塩素
の含有量を測定することができる水質計測方法を提供す
ることを目的とする。The present invention is to solve the above problems, by measuring the electrical conductivity of the sample water to measure the content of residual chlorine present in the sample water without being affected by coexisting substances or suspended substances in the sample water. It is an object of the present invention to provide a water quality measuring method capable of performing the above.
課題を解決するための手段 上記課題を解決するために本発明は、一対の流路をガ
ス透過膜を介して連通し、一方の流路に残留塩素を含む
試料水を流通させるとともに、他方の流路に電気伝導率
が一定の溶媒を流通させ、一方の流路を流通する試料水
に塩基性度を調整するために酸性溶液を添加し、酸性溶
液との反応によってガス状となった残留塩素をガス透過
膜を通して分離抽出し、抽出した残留塩素を他方の流路
を流通する溶媒中に溶解吸収し、残留塩素を吸収した溶
媒の電気伝導率を他方の流路に介装された電気伝導率計
で測定し、測定された電気伝導率に基づいて残留塩素の
濃度を検知する構成としたものである。Means for Solving the Problems In order to solve the above problems, the present invention communicates a pair of channels through a gas permeable membrane, and allows one channel to flow a sample water containing residual chlorine, and the other channel. A solvent having a constant electric conductivity is circulated in the channel, an acidic solution is added to the sample water flowing in one channel to adjust the basicity, and a gasified residue is caused by the reaction with the acidic solution. Chlorine is separated and extracted through the gas permeable membrane, the extracted residual chlorine is dissolved and absorbed in the solvent flowing through the other channel, and the electrical conductivity of the solvent that absorbed the residual chlorine is converted to the electrical conductivity of the other channel. The measurement is made with a conductivity meter, and the concentration of residual chlorine is detected based on the measured electric conductivity.
作用 上記した構成により、試料水中の残留塩素はイオン状
態もしくは他の物質の化合物として存在し、酸性溶液と
反応することによりガス状の単物質として生成する。そ
して、ガス状の残留塩素を分離膜を通して他方の流路を
流れる溶媒中に吸収することによって試料水中の他の共
存物質や浮遊物質が排除されることとなる。さらに、溶
媒の電気伝導率は残留塩素が溶解することによって変動
し、その変動値は残留塩素の溶解量に比例し、残留塩素
の溶解量は試料水中に含まれる残留塩素の含有量に比例
する。このため、溶媒の電気伝導率を測定することによ
って試料水中に含まれる残留塩素の濃度を検知すること
が可能となる。Action With the above-described configuration, residual chlorine in the sample water exists in an ionic state or as a compound of another substance, and is produced as a gaseous single substance by reacting with the acidic solution. Then, by absorbing the residual chlorine in a gaseous state into the solvent flowing through the other channel through the separation membrane, other coexisting substances and suspended substances in the sample water are eliminated. Furthermore, the electrical conductivity of the solvent fluctuates as the residual chlorine dissolves, and the fluctuation value is proportional to the amount of residual chlorine dissolved, and the amount of residual chlorine dissolved is proportional to the content of residual chlorine contained in the sample water. . Therefore, it is possible to detect the concentration of residual chlorine contained in the sample water by measuring the electric conductivity of the solvent.
実施例 以下本発明の一実施例を図面に基づいて説明する。第
１図において、試料水管１の途中には分離部２が形成さ
れており、試料水管１の内部には残留塩素を含む試料水
３が流通している。また、分離部２を貫通して溶媒管４
が設けられており、溶媒管４の内部には純水もしくはア
ルカリ性溶液等の電気伝導率が一定の溶媒５が流通して
いる。さらに、分離部２において試料水管１と溶媒管４
はガス透過膜チューブ６を介して連通しており、ガス透
過膜チューブ６は多孔性チューブで形成されている。そ
して、溶媒管４の途中には電気伝導率計７が介装されて
おり、試料水管１の途中には酸性溶液管８が連通してい
る。また、酸性溶液管８の内部には塩酸溶液もしくは硫
酸溶液の酸性溶液９が流通している。さらに、試料水管
１と溶媒管４と酸性溶液管８の一端がそれぞれ試料水槽
10と溶媒槽11と酸性溶液槽12に連通するとともに、各管
1,4,8の途中にはそれぞれ送液ポンプ13,14,15が介装さ
れている。Embodiment An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, a separation part 2 is formed in the middle of a sample water pipe 1, and a sample water 3 containing residual chlorine flows inside the sample water pipe 1. Also, the solvent pipe 4 is penetrated through the separation part 2.
Is provided, and a solvent 5 having a constant electric conductivity, such as pure water or an alkaline solution, flows inside the solvent tube 4. Further, in the separation unit 2, the sample water pipe 1 and the solvent pipe 4
Communicate with each other via a gas permeable membrane tube 6, and the gas permeable membrane tube 6 is formed of a porous tube. An electric conductivity meter 7 is provided in the middle of the solvent tube 4, and an acidic solution tube 8 is in communication with the sample water tube 1. An acidic solution 9 of hydrochloric acid solution or sulfuric acid solution is circulated inside the acidic solution pipe 8. Furthermore, one end of each of the sample water pipe 1, the solvent pipe 4, and the acid solution pipe 8 is a sample water tank.
10 and solvent tank 11 and acidic solution tank 12 communicate with each pipe
Liquid feed pumps 13, 14, and 15 are provided in the middle of 1, 4, and 8, respectively.
以下、上記構成における作用について説明する。送液
ポンプ13を駆動して試料水槽10の試料水３を試料水管１
に供給するとともに、送液ポンプ14を駆動して溶媒槽11
の溶媒５を溶媒管４に供給する。この状態において電気
伝導率計７によって溶媒５の電気伝導率を測定し、測定
した電気伝導率を基準値とする。そして、送液ポンプ15
を駆動して酸性溶液槽12の酸性溶液９を酸性溶液管８に
供給し、試料水管１を流通する試料水３に酸性溶液９を
添加する。この酸性溶液９の添加によって試料水３の塩
基性度が調整され、pHがアルカリ性領域から酸性領域に
移行する。このとき、試料水３に含有された残留塩素で
ある残留塩素は、アルカリ性領域においてはHOCl,OCl-
の状態で存在し、酸性領域においてはガス状態のCl2と
して存在する。この反応は下記に示すものである。The operation of the above configuration will be described below. The liquid feed pump 13 is driven to feed the sample water 3 in the sample water tank 10 to the sample water pipe 1
To the solvent tank 11 by driving the liquid feed pump 14
Of the solvent 5 is supplied to the solvent pipe 4. In this state, the electric conductivity of the solvent 5 is measured by the electric conductivity meter 7, and the measured electric conductivity is used as a reference value. And the liquid delivery pump 15
Is driven to supply the acidic solution 9 in the acidic solution tank 12 to the acidic solution pipe 8, and the acidic solution 9 is added to the sample water 3 flowing through the sample water pipe 1. By adding this acidic solution 9, the basicity of the sample water 3 is adjusted, and the pH shifts from the alkaline region to the acidic region. At this time, residual chlorine is the residual chlorine contained in the sample water 3, HOCl in the alkaline region, OCl -
In the acidic region, it exists as gaseous Cl 2 . This reaction is shown below.
HOCl＋HCl→H2O＋Cl2 そして、分離部２に流入したCl2はガス透過膜チュー
ブ６を透過して溶媒管４に流入し、溶媒５に溶解する。
このため、試料水３に含まれた他の共存物質が排除され
るので、残留塩素のみが溶媒５にOCl-の状態で存在す
る。また、溶媒５の電気伝導率はOCl-が溶解することに
よって変動し、その変動値はOCl-の溶解量に比例し、OC
l-の溶解量は試料水３に含まれる残留塩素の含有量に比
例する。 HOCl + HCl → H 2 O + Cl 2 and, Cl 2 that has flowed into the separating unit 2 flows into the solvent tube 4 passes through the gas permeable membrane tube 6, dissolved in a solvent 5.
Therefore, other coexisting substances contained in the sample water 3 are excluded, and only residual chlorine exists in the solvent 5 in the state of OCl − . The electric conductivity of the solvent 5 OCl - vary by dissolves, the variation value OCl - proportional to the amount of dissolved, OC
The amount of l − dissolved is proportional to the content of residual chlorine contained in the sample water 3.
このため、OCl-が溶解した溶媒５の電気伝導率を電気
伝導率計７で測定し、測定した電気伝導率の値に基づい
て試料水３に含まれる残留塩素の濃度を検知する。Therefore, the electric conductivity of the solvent 5 in which OCl − is dissolved is measured by the electric conductivity meter 7, and the concentration of residual chlorine contained in the sample water 3 is detected based on the measured electric conductivity value.
発明の効果 以上述べたように、本発明によれば、酸性溶液との反
応によってガス状となった残留塩素をガス透過膜を通し
て分離抽出した後に、溶媒中に吸収することによって試
料水中の他の共存物質を排除することができ、溶媒の電
気伝導率を測定することによって試料水中に含まれる残
留塩素の濃度を検知することができる。EFFECTS OF THE INVENTION As described above, according to the present invention, residual chlorine gasified by a reaction with an acidic solution is separated and extracted through a gas permeable membrane, and then absorbed in a solvent to absorb other chlorine in the sample water. The coexisting substance can be eliminated, and the concentration of residual chlorine contained in the sample water can be detected by measuring the electric conductivity of the solvent.
第１図は本発明の一実施例を示す全体構成図である。 ３……試料水、５……溶媒、６……ガス透過膜チュー
ブ、７……電気伝導率計。FIG. 1 is an overall configuration diagram showing an embodiment of the present invention. 3 ... Sample water, 5 ... Solvent, 6 ... Gas permeable membrane tube, 7 ... Electrical conductivity meter.
Claims (1)
一方の流路に残留塩素を含む試料水を流通させるととも
に、他方の流路に電気伝導率が一定の溶媒を流通させ、
一方の流路を流通する試料水に塩基性度を調整するため
に酸性溶液を添加し、酸性溶液との反応によってガス状
となった残留塩素をガス透過膜を通して分離抽出し、抽
出した残留塩素を他方の流路を流通する溶媒中に溶解吸
収し、残留塩素を吸収した溶媒の電気伝導率を他方の流
路に介装された電気伝導率計で測定し、測定された電気
伝導率に基づいて残留塩素の濃度を検知することを特徴
とする水質計測方法。1. A pair of flow paths are connected through a gas permeable membrane,
A sample water containing residual chlorine is circulated in one channel, and a solvent having a constant electric conductivity is circulated in the other channel,
An acidic solution was added to the sample water flowing through one of the channels to adjust the basicity, and residual chlorine gasified by the reaction with the acidic solution was separated and extracted through a gas permeable membrane. Is dissolved and absorbed in the solvent flowing through the other channel, and the electrical conductivity of the solvent that has absorbed residual chlorine is measured with an electrical conductivity meter interposed in the other channel, and the measured electrical conductivity is A water quality measuring method characterized by detecting the concentration of residual chlorine based on the above.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14412090A JPH0830687B2 (en) | 1990-05-31 | 1990-05-31 | Water quality measurement method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14412090A JPH0830687B2 (en) | 1990-05-31 | 1990-05-31 | Water quality measurement method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0436650A JPH0436650A (en) | 1992-02-06 |
| JPH0830687B2 true JPH0830687B2 (en) | 1996-03-27 |
Family
ID=15354659
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14412090A Expired - Lifetime JPH0830687B2 (en) | 1990-05-31 | 1990-05-31 | Water quality measurement method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0830687B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7195910B2 (en) * | 2018-12-14 | 2022-12-26 | クリナップ株式会社 | Free residual chlorine concentration calculation method, free residual chlorine concentration calculation system, and space cleaning system |
| CN110320244B (en) * | 2019-07-29 | 2021-08-24 | 山东省科学院海洋仪器仪表研究所 | A seawater salinity measurement system and method based on quadrature lock-in amplification technology |
-
1990
- 1990-05-31 JP JP14412090A patent/JPH0830687B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0436650A (en) | 1992-02-06 |
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