JP2002214178A5

JP2002214178A5 -

Info

Publication number: JP2002214178A5
Application number: JP2001012820A
Authority: JP
Filing date: 2001-01-22
Publication date: 2007-10-04

Description

【請求項１】水処理系における水処理用薬品の濃度を測定するに際し、水処理用薬品を含む試料を酸化し、試料の酸化前の電気伝導度と酸化後の電気伝導度との差分を、少なくとも２個の電極を有する電気伝導度測定セルを前記酸化前の位置と酸化後の位置とに配置し、両電気伝導度測定セルからの検出信号自身の差分を両電気伝導度測定セルの位置間の試料の電気伝導度の差分として出力する差伝導度計を用いて検出することにより、水処理用薬品の酸化分解によって生じた電気伝導度増加量を測定し、該電気伝導度増加量から試料中の水処理用薬品の濃度を定量することを特徴とする、水処理用薬品の濃度測定方法。 When measuring the concentration of a water treatment chemical in a water treatment system, a sample containing the water treatment chemical is oxidized, and the difference between the electrical conductivity of the sample before oxidation and the electrical conductivity after oxidation is determined. An electric conductivity measuring cell having at least two electrodes is arranged at the position before the oxidation and the position after the oxidation, and a difference between the detection signals themselves from the electric conductivity measuring cells is compared with the electric conductivity measuring cell. by detecting with differential conductivity meter for outputting a difference between the electric conductivity of the sample between the position to measure the electrical conductivity increase caused by oxidative decomposition of chemicals for water treatment, electric conductivity increase A method for measuring the concentration of a water treatment chemical, comprising quantifying the concentration of the water treatment chemical in a sample from the sample.

【００１６】
【課題を解決するための手段】
上記課題を解決するために、本発明者等は、上記従来技術の問題点を解決すべく鋭意研究を重ねた結果、水処理系に添加する水処理用薬品の特定の有効成分自体の水中濃度を測定する方法として、水処理用薬品を含む試料を酸化し、酸化分解によって生じた電気伝導度増加量を高精度と長期安定性を兼備した新規な電気伝導度計（差伝導度計）で測定し、この電気伝導度増加量から試料中の水処理用薬品濃度を定量することができるという知見を得、この知見に基づいて水処理用薬品の濃度測定および管理を行うことができることを見出し、本発明を完成するに至った。 [0016]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present inventors have conducted intensive studies to solve the above-mentioned problems of the prior art, and as a result, the water concentration of a specific active ingredient itself of a water treatment chemical added to a water treatment system has been reduced. as a method for measuring, by oxidizing the samples containing chemicals for water treatment, novel electrical conductance meter the electric conductivity Shirubedo increase caused by oxidative decomposition to combine a high precision and long-term stability (differential conductivity meter) And that the concentration of the water treatment chemical in the sample can be quantified from the increase in electrical conductivity. Based on this knowledge, the concentration measurement and management of the water treatment chemical can be performed. As a result, the present invention has been completed.

即ち、本発明に係る水処理用薬品の濃度測定方法は、水処理系における水処理用薬品の濃度を測定するに際し、水処理用薬品を含む試料を酸化し、試料の酸化前の電気伝導度と酸化後の電気伝導度との差分を、少なくとも２個の電極を有する電気伝導度測定セルを前記酸化前の位置と酸化後の位置とに配置し、両電気伝導度測定セルからの検出信号自身の差分を両電気伝導度測定セルの位置間の試料の電気伝導度の差分として出力する差伝導度計を用いて検出することにより、水処理用薬品の酸化分解によって生じた電気伝導度増加量を測定し、該電気伝導度増加量から試料中の水処理用薬品の濃度を定量することを特徴とする方法からなる。 That is, the method for measuring the concentration of a chemical for water treatment according to the present invention, when measuring the concentration of the chemical for water treatment in a water treatment system, oxidizes a sample containing the chemical for water treatment, and conducts the electric conductivity of the sample before oxidation. The difference between the electrical conductivity after oxidation and the electrical conductivity after oxidation is determined by arranging an electrical conductivity measurement cell having at least two electrodes at a position before oxidation and a position after oxidation, and detecting signals from both electrical conductivity measurement cells. by detecting their differences using the difference conductivity meter for outputting a difference between the electric conductivity of the sample between the positions of both the electric conductivity measuring cell, it increases the electrical conductivity caused by the oxidative decomposition of water treatment chemicals And measuring the amount of the water treatment chemical in the sample from the increase in electric conductivity.

次に、本発明のより具体的な実施の形態について説明するが、本発明はこれらに限定されるものではない。
本発明に係る水処理系（例えば、冷却水系）の水処理用薬品の濃度管理方法においては、検出対象薬品の検量線を予め作成しておく。この様な検量線は、検出対象薬品を含まないブランク水及び異なる既知検出対象薬品濃度の幾つかの対象水の差分伝導度の測定を行って作成する。なお、ブランク水としては、検出対象薬品のみを含まず他の成分（例えば、不純物成分や他の水処理用薬品）は同じブランク水を用いるのが測定精度の点で好ましいことは勿論である。 Next, more specific embodiments of the present invention will be described, but the present invention is not limited thereto.
In the method for managing the concentration of a chemical for water treatment in a water treatment system (for example, a cooling water system) according to the present invention, a calibration curve of a chemical to be detected is created in advance. Such calibration curve is prepared by performing a measurement of the difference conductivity of several target water Blank and different known detection target chemical concentration which does not include the detection target chemicals. It is needless to say that it is preferable to use the same blank water as the blank water, not including only the chemical to be detected but other components (eg, impurity components and other water treatment chemicals) in terms of measurement accuracy.

次に、本発明に係る方法を実施する装置のシステムについて説明する。装置は、前述の如く、基本的にキャリア溶液を送液するポンプ、ポリカルボン酸及び／又はリン化合物を含む試料溶液をキャリア溶液中に注入するインジェクター、ポリカルボン酸類及び／又はリン化合物類を酸化する酸化反応器（酸化手段）、酸化前後の電気伝導度を測定する差伝導度計、差伝導度計で測定されたデータを記録するデータプロセッサーで構成されている。ただし、場合によっては、リン化合物類を含む試料溶液そのものを連続的に供給し、キャリア溶液を用いないこともあるため、そのような系ではインジェクターは不要となる。 Next, a system of an apparatus for performing the method according to the present invention will be described. As described above, the apparatus basically includes a pump for sending a carrier solution, an injector for injecting a sample solution containing a polycarboxylic acid and / or a phosphorus compound into the carrier solution, and oxidizing a polycarboxylic acid and / or a phosphorus compound. oxidation reactor (oxidation section), differential conductivity meter for measuring the electrical conductivity before and after oxidation, and a data processor which records the measured data by the difference conductivity meter. However, in some cases, the sample solution itself containing the phosphorus compound is continuously supplied and the carrier solution is not used. Therefore, such a system does not require an injector.

上記データプロセッサーは、電気伝導度増加量対ポリカルボン酸類及び／又はリン化合物類の検量線を内包し、ポリカルボン酸類及び／又はリン化合物類濃度計算等の演算処理を行うことができるのが好ましく、更に必要に応じて、ポリカルボン酸類及び／又はリン化合物類含有溶液を供給するポンプ等のポンプ類の制御信号を出力できることが好ましい。 The data processor encloses a calibration curve of electrical conductivity increase vs. polycarboxylic acids and / or phosphorus compounds, it is preferred it is possible to perform arithmetic processing, such as polycarboxylic acids and / or phosphorus compounds concentration calculated It is preferable that a control signal of a pump such as a pump for supplying a solution containing a polycarboxylic acid and / or a phosphorus compound can be output as necessary.

なお、上記装置に加えて、差伝導度計の電極表面での気泡生成を抑制するためのデガッサーや、試料とキャリア液とを均一に混合するためのインラインミキサーや混合コイル等の混合器などを必要に応じて設置してもよい。 In addition to the apparatus, and degasser for suppressing bubble formation at the electrode surface of the Saden conductive meter, sample a mixer such as a line mixer or mixing coils for mixing the carrier liquid uniformly etc. May be installed as needed.

更に具体的に、本発明に係る測定方法および装置を図１２を用いて説明する。図１２は、本発明の測定方法を実施する装置の一例である。キャリア液には、インジェクター３０１から一定量のポリカルボン酸及び／又はリン化合物を含む試料が注入される。この試料を含むキャリア液は、ポンプ３０２により酸化反応器３０４（酸化手段）の直前に設置された差伝導度計３０６の一方の電気伝導度測定セル３０３の位置に供給される。ここで酸化前の電気伝導度を測定された試料を含むキャリア液は、酸化反応器３０４で連続的に酸化されて、差伝導度計３０６の他方の電気伝導度測定セル３０５の位置に供給される。差伝導度計３０６では酸化前の電気伝導度から酸化後の電気伝導度への増加量（変化分）が測定され、データプロセッサー３０７に記録されるとともに、その電気伝導度増加量から、ポリカルボン酸及び／又はリン化合物が定量される。 More specifically, a measuring method and an apparatus according to the present invention will be described with reference to FIG. FIG. 12 is an example of an apparatus for performing the measurement method of the present invention. A sample containing a certain amount of polycarboxylic acid and / or phosphorus compound is injected from the injector 301 into the carrier liquid. The carrier liquid containing the sample is supplied by the pump 302 to the position of one electric conductivity measuring cell 303 of the differential conductivity meter 306 installed immediately before the oxidation reactor 304 (oxidizing means ). Here, the carrier liquid containing the sample whose electric conductivity before oxidation is measured is continuously oxidized in the oxidation reactor 304 and supplied to the position of the other electric conductivity measurement cell 305 of the differential conductivity meter 306. You. The difference conductivity meter 306 measures the amount of increase (change) from the electric conductivity before oxidation to the electric conductivity after oxidation, is recorded in the data processor 307, and based on the amount of increase in electric conductivity, the polycarbonate is measured. Acid and / or phosphorus compounds are quantified.