JP2016217741A - Apparatus and method for measuring concentration of dissolved component - Google Patents
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Abstract
Description
本発明は、冷却水系やボイラ水等の水中の溶存成分濃度を測定する装置及び方法に関する。 The present invention relates to an apparatus and method for measuring the concentration of dissolved components in water such as a cooling water system and boiler water.
水を利用するプラントを安全かつ効率よく運転するためには、そのプラントに適した水質管理を行うことが必要であり、障害が発生する水質にならないよう、常に適切な薬品濃度の維持や濃縮管理といった水質条件を制御することが求められている。
そこで、冷却水系等においては、循環水中の溶存成分濃度を、現場にてオンラインやバッチで測定することが行われている。
In order to operate a plant that uses water safely and efficiently, it is necessary to perform water quality management suitable for the plant, and always maintain appropriate chemical concentration and concentrate management so that the water quality does not cause trouble. It is required to control the water quality conditions.
Therefore, in a cooling water system or the like, the concentration of dissolved components in circulating water is measured on-site or batchwise.
例えば、バッチでの水質測定装置として、特許文献１には、吸光光度法での残留塩素の検出方法と試験具が記載されている。 For example, Patent Document 1 discloses a method for detecting residual chlorine by an absorptiometric method and a test device as a water quality measuring device in a batch.
また、特許文献２には、冷却水系やボイラ等の蒸気発生設備を備える水系のスケール、腐食、及び汚れ防止等、水処理の目的のために添加されるアクリル酸重合体、アクリル酸共重合体、マレイン酸重合体、マレイン酸共重合体等のアニオン性ポリマー濃度の測定方法として、エチレンジアミン四酢酸塩（ＥＤＴＡ）等のキレート剤の水溶液を封入した測定セルに、検水を注入後、塩化ベンゼトニウム等の第四級アンモニウム塩の水溶液を添加し、攪拌してアニオン性ポリマーと反応させて白濁を生じさせ、波長が４００〜９００ｎｍのいずれかの可視光線の透過率又は吸光度を測定してアニオン性ポリマーの濃度を測定する方法が記載されている。
また、吸光度測定による水中のリン酸イオン濃度の分析試薬として、硫酸、七モリブデン酸六アンモニウム四水和物、酒石酸アンチモニルカリウムおよびアルコルビン酸を含む試薬（ＪＩＳ Ｋ０１０１：１９９８）が提供されている。 In addition, a reagent (JIS K0101: 1998) containing sulfuric acid, hexaammonium heptamolybdate tetrahydrate, antimonyl potassium tartrate, and ascorbic acid is provided as an analysis reagent for phosphate ion concentration in water by absorbance measurement.
一般的に、吸光光度法では、測定の前にサンプル水の温度調整を行い、充分な反応時間を確保して、透過率又は吸光度測定を行う。しかし、屋外等の現場で実施するバッチ測定の場合、ヒーターやクーラーなどを用いてサンプル水の温度を調整するには、大掛かりな機材の準備が必要な上、温度調整に時間を要するため、操作性が大きく低下する問題があった。 Generally, in the absorptiometry, the temperature of sample water is adjusted before measurement, and a sufficient reaction time is ensured to measure transmittance or absorbance. However, in the case of batch measurement performed outdoors such as outdoors, adjusting the temperature of the sample water using a heater or cooler requires preparation of large-scale equipment and requires time for temperature adjustment. There was a problem that the performance was greatly reduced.
この対策として、特許文献１には換算式を用いて温度補正することが記載されているが、測定対象によっては発色が安定する時間がズレたり、検量線そのものが異なったりし、定量的な温度補正では正しい結果が得られない場合があった。
また、現場で多くのサンプルを分析するために、測定に要する時間の短縮が望まれている。
As a countermeasure, Patent Document 1 describes that temperature correction is performed using a conversion formula. However, depending on the measurement target, the time during which the color development is stabilized may be shifted, the calibration curve itself may be different, and the quantitative temperature may be changed. In some cases, correct results could not be obtained.
Further, in order to analyze many samples on site, it is desired to shorten the time required for measurement.
本発明は、サンプル水の温度によって測定値が大きく変化する透過率又は吸光度に基づいて溶存成分濃度を測定するに当たり、サンプル水温を一定にするための大掛かりな装置を用いることなく、サンプル水の溶存成分濃度を精度よく簡便に測定することができる装置と測定方法を提供することを目的とする。本発明はまた、測定に要する時間を短縮することができる水中の溶存成分濃度の測定装置と測定方法を提供することを目的とする。 In the present invention, when measuring the concentration of dissolved components on the basis of transmittance or absorbance whose measured values vary greatly depending on the temperature of the sample water, the sample water can be dissolved without using a large-scale device for keeping the sample water temperature constant. It is an object of the present invention to provide an apparatus and a measuring method that can easily and accurately measure component concentrations. Another object of the present invention is to provide an apparatus and a method for measuring the concentration of dissolved components in water that can reduce the time required for measurement.
本発明者は、上記目的を達成するため、鋭意研究を行った結果、測定時のサンプル水の温度に応じて検量線や測定値の読み込みタイミングを変更することにより、測定精度を向上させることができ、また、測定時間を短縮することができることを見出した。
即ち、本発明は以下を要旨とする。
As a result of earnest research to achieve the above object, the inventor can improve the measurement accuracy by changing the calibration curve and the reading timing of the measurement value according to the temperature of the sample water at the time of measurement. It has also been found that the measurement time can be shortened.
That is, the gist of the present invention is as follows.
［１］ 測定する溶存成分の濃度が既知である、温度の異なる複数の標準サンプル水に対して、可視光を照射した際の透過率又は吸光度の経時変化を含む情報を記憶し、この記憶データに基づいて、未知サンプル水の溶存成分濃度を求める吸光光度法による水中の溶存成分濃度の測定装置であって、該未知サンプル水の温度に基づいて、使用する検量線、及び／又は透過率又は吸光度の読み込みタイミングを変更するように設定されていることを特徴とする水中の溶存成分濃度の測定装置。 [1] Stores information including changes over time in transmittance or absorbance when a plurality of standard sample waters having different temperatures, whose concentrations of dissolved components to be measured are known, are irradiated with visible light. Is a measuring apparatus for the concentration of dissolved components in water by an absorptiometric method for determining the concentration of dissolved components in an unknown sample water based on the calibration curve used and / or transmittance or An apparatus for measuring the concentration of dissolved components in water, wherein the apparatus is set to change the reading timing of absorbance.
［２］ ［１］において、温度の異なる複数の標準サンプル水について測定した透過率又は吸光度に基づいて、温度毎に複数の検量線が作製され、前記未知サンプル水の温度に最も近い温度の検量線を選択使用するように設定されていることを特徴とする水中の溶存成分濃度の測定装置。 [2] In [1], a plurality of calibration curves are prepared for each temperature based on the transmittance or absorbance measured for a plurality of standard sample waters having different temperatures, and the calibration at the temperature closest to the temperature of the unknown sample water is performed. An apparatus for measuring the concentration of dissolved components in water, wherein the line is set to be selectively used.
［３］ ［１］又は［２］において、前記未知サンプル水の温度に最も近い温度の標準サンプル水の透過率又は吸光度の経時変化から、該未知サンプル水の透過率又は吸光度の読み込みタイミングを決定するように設定されていることを特徴とする水中の溶存成分濃度の測定装置。 [3] In [1] or [2], the reading timing of the transmittance or absorbance of the unknown sample water is determined from the change over time in the transmittance or absorbance of the standard sample water at a temperature closest to the temperature of the unknown sample water. An apparatus for measuring the concentration of dissolved components in water, characterized by being set to
［４］ 測定する溶存成分の濃度が既知である、温度の異なる複数の標準サンプル水に対して、可視光を照射した際の透過率又は吸光度の経時変化を含む情報を記憶し、この記憶データに基づいて、未知サンプル水の溶存成分濃度を求める吸光光度法による水中の溶存成分濃度の測定方法であって、該未知サンプル水の温度に基づいて、使用する検量線、及び／又は透過率又は吸光度の読み込みタイミングを変更することを特徴とする水中の溶存成分濃度の測定方法。 [4] Information including time-dependent changes in transmittance or absorbance when irradiated with visible light is stored in a plurality of standard sample waters having different temperatures and known concentrations of dissolved components to be measured. Is a method for measuring the concentration of a dissolved component in water by an absorptiometric method for determining the concentration of a dissolved component in an unknown sample water, wherein a calibration curve to be used and / or a transmittance or A method for measuring the concentration of a dissolved component in water, wherein the absorbance reading timing is changed.
［５］ ［４］において、温度の異なる複数の標準サンプル水について測定した透過率又は吸光度に基づいて、温度毎に複数の検量線を作製し、前記未知サンプル水の温度に最も近い温度の検量線を選択使用することを特徴とする水中の溶存成分濃度の測定方法。 [5] In [4], a plurality of calibration curves are prepared for each temperature based on the transmittance or absorbance measured for a plurality of standard sample waters having different temperatures, and the calibration at the temperature closest to the temperature of the unknown sample water is made. A method for measuring the concentration of dissolved components in water, wherein a line is selectively used.
［６］ ［４］又は［５］において、前記未知サンプル水の温度に最も近い温度の標準サンプル水の透過率又は吸光度の経時変化から、該未知サンプル水の透過率又は吸光度の読み込みタイミングを決定することを特徴とする水中の溶存成分濃度の測定方法。 [6] In [4] or [5], the reading timing of the transmittance or absorbance of the unknown sample water is determined from the change over time in the transmittance or absorbance of the standard sample water at a temperature closest to the temperature of the unknown sample water. A method for measuring the concentration of dissolved components in water.
本発明によれば、サンプル水の温度によって測定値が大きく変化する透過率又は吸光度に基づいて溶存成分濃度を測定するに当たり、サンプル水の水温に影響を受けることなく、高精度な測定を行える。このため、サンプル水温を一定にするための大掛かりな装置を用いることなく、サンプル水の溶存成分濃度を精度よく簡便に測定することができる。また、本発明によれば、サンプル水の水温に応じて透過率又は吸光度の読み込みタイミングを変更することで、測定に要する時間を短縮することも可能であり、測定精度の向上と測定時間の短縮で、冷却水系等における水質管理を確実かつ効率的に行うことが可能となる。 According to the present invention, when measuring the concentration of a dissolved component based on the transmittance or absorbance at which the measured value greatly changes depending on the temperature of the sample water, high-precision measurement can be performed without being affected by the water temperature of the sample water. For this reason, the dissolved component density | concentration of sample water can be measured accurately and simply, without using the large apparatus for making sample water temperature constant. In addition, according to the present invention, it is possible to shorten the time required for measurement by changing the reading timing of the transmittance or absorbance according to the water temperature of the sample water, thereby improving the measurement accuracy and shortening the measurement time. Thus, it is possible to reliably and efficiently perform water quality management in the cooling water system or the like.
以下に図面を参照して本発明の実施の形態を詳細に説明する。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
図１は、本発明の水中の溶存成分濃度の測定装置の実施の形態の一例を示す構成ブロック図である。 FIG. 1 is a configuration block diagram showing an example of an embodiment of an apparatus for measuring dissolved component concentration in water according to the present invention.
吸光度測定部１で得た吸光度（又は透過率）と、温度測定部２で得られた温度の検出信号がＡ／Ｄ変換器３でデジタル信号に変換され、コンピュータ１０の演算部４に入力される。この演算部４は、記憶部５から与えられる各温度における透過率や吸光度の読み込みタイミング（反応時間）と検量線情報に応じて溶存成分濃度の演算を行い、その結果を液晶などからなる表示部６に表示する。なお、記憶部５は、新しい薬剤種類が追加された際に入力部７を通して新規な検量線を追加することができる。これらの検量線や上記の演算結果は通信回線を通じて管理センター等に送信されてもよい。また、測定はオンラインでもバッチでもいずれの方法で実施してもよい。
The absorbance (or transmittance) obtained by the absorbance measurement unit 1 and the temperature detection signal obtained by the
［態様Ｉ］
本発明の一態様では、測定する溶存成分の濃度が既知の、温度が異なる複数の標準サンプル水に対して、可視光を照射した際の透過率又は吸光度を測定し、その測定値の経時変化を含む情報を記憶部５に入力して記憶させる。一方、溶存成分濃度を測定するべき未知サンプル水について温度と可視光の透過率又は吸光度を測定して測定値を演算部４に入力する。演算部４では、記憶部５に記憶された各温度の標準サンプル水の透過率又は吸光度の測定値に基づいて作成された各温度毎の検量線の中から、未知サンプル水の温度に対応する検量線（未知サンプル水の温度と同一の温度の検量線又は未知サンプル水の温度に最も近い温度の検量線）を選択し、この検量線に基づいて、未知サンプル水の透過率又は吸光度の測定値から、未知サンプル水の溶存成分濃度を求める。
なお、上記の未知サンプル水の温度に対応する検量線として、未知サンプル水の温度よりも高いか低いかを問うことなく、未知サンプル水の温度に最も近い温度の検量線を選択してもよく、未知サンプル水の温度よりも高い温度であって、未知サンプル水の温度に最も近い温度の検量線（検量線１という）を選択してもよく、未知サンプル水の温度よりも低い温度であって、未知サンプル水の温度に最も近い温度の検量線（検量線２という）を選択してもよく、検量線１と検量線２とに基づき補間して作成した検量線に基づいて未知サンプル水の溶存成分濃度を求めるようにしてもよい。
[Aspect I]
In one embodiment of the present invention, the transmittance or absorbance when irradiated with visible light is measured on a plurality of standard sample waters whose concentrations of dissolved components to be measured are known and different in temperature, and the measured values change over time. Is input to and stored in the
Note that the calibration curve corresponding to the temperature of the unknown sample water may be selected as the calibration curve corresponding to the temperature of the unknown sample water, regardless of whether the temperature is higher or lower than the temperature of the unknown sample water. A calibration curve (referred to as calibration curve 1) that is higher than the temperature of the unknown sample water and closest to the temperature of the unknown sample water may be selected, and the temperature is lower than the temperature of the unknown sample water. The calibration curve (referred to as calibration curve 2) having the temperature closest to the temperature of the unknown sample water may be selected, and the unknown sample water based on the calibration curve created by interpolation based on the calibration curve 1 and the
［態様II］
本発明の別の態様では、測定する溶存成分の濃度が既知の、温度が異なる複数の標準サンプル水に対して、可視光を照射した際の透過率又は吸光度を測定し、その測定値の経時変化を含む情報を記憶部５に入力して記憶させる。一方、演算部４では、この記憶部５から取得した測定値の経時変化から、各温度毎に測定値が安定するに要する時間を決定し、これを未知サンプル水の測定値の読み込みタイミングとし、未知サンプル水について測定された温度に対して決定された読み込みタイミングにおける透過率又は吸光度の測定値を取り込む。この場合においても、上記態様Ｉと同様に、演算部４では、記憶部５からの情報に基づいて、各温度の標準サンプル水の透過率又は吸光度の測定値に基づいて、各温度毎の検量線が作製され、未知サンプル水の温度に対応する検量線（未知サンプル水の温度と同一の温度の検量線又は未知サンプル水の温度に最も近い温度の検量線（検量線１又は検量線２、あるいは検量線１と検量線１から補間して作成した検量線））を選択して、この検量線に基づいて、未知サンプル水の透過率又は吸光度の測定値から、未知サンプル水の溶存成分濃度を求めることが好ましい。
[Aspect II]
In another aspect of the present invention, the transmittance or absorbance when irradiated with visible light is measured on a plurality of standard sample waters having different concentrations of dissolved components to be measured, and the measured values are measured over time. Information including changes is input to the
上記態様Ｉでは、未知サンプル水の温度により測定値が変動する透過率又は吸光度に基づいて溶存成分濃度を求める場合において、未知サンプル水の温度に対応して検量線を選択して用いることにより、温度による測定誤差をなくして精度のよい測定を行うことができる。 In the above aspect I, when obtaining the dissolved component concentration based on the transmittance or absorbance at which the measured value varies depending on the temperature of the unknown sample water, by selecting and using a calibration curve corresponding to the temperature of the unknown sample water, Measurement error due to temperature can be eliminated and accurate measurement can be performed.
また、上記態様IIでは、例えば、未知サンプル水の発色のための試薬等を添加して透過率又は吸光度を測定する場合、その発色が安定するに要する時間が温度によって異なる場合において、温度に応じて測定値を得るまでの必要な反応時間を確保して読み込みタイミングを決定し、反応時間の過不足をなくして測定に要する時間を短縮することができる。 Further, in the above aspect II, for example, when measuring transmittance or absorbance by adding a reagent or the like for coloring of unknown sample water, depending on the temperature, the time required for the coloring to stabilize varies depending on the temperature. Thus, it is possible to secure the necessary reaction time until obtaining the measured value and determine the reading timing, eliminate the excess and deficiency of the reaction time, and shorten the time required for the measurement.
なお、温度の異なる複数の標準サンプル水の温度間隔には特に制限はなく、測定する溶存成分や未知サンプル水の温度の変動幅に応じて適宜決定されるが、徒に標準サンプル水数を多くすることなく、高精度な測定を行う上で、５〜６０℃程度の温度間隔で標準サンプル水を調製して検量線を作製することが好ましい。 There are no particular restrictions on the temperature interval between multiple standard sample waters with different temperatures, and they are determined as appropriate depending on the dissolved component to be measured and the temperature fluctuation range of the unknown sample water. Without performing the measurement, it is preferable to prepare a standard curve by preparing standard sample water at a temperature interval of about 5 to 60 ° C. in order to perform highly accurate measurement.
以下、実施例及び比較例により本発明を具体的に示すが、本発明は下記実施例に限定されるものではない。 EXAMPLES Hereinafter, although an Example and a comparative example show this invention concretely, this invention is not limited to the following Example.
＜実施例１＞
光路長１０ｍｍ、光路幅１０ｍｍ、高さ４５ｍｍ、外幅１２．５ｍｍのポリスチレン製の測定セルに、ＥＤＴＡ０．７重量％水溶液１．５ｍＬを封入した。このセルに、５℃、１５℃又は３５℃に調整した、５ｍｇ／Ｌ、１０ｍｇ／Ｌ、１５ｍｇ／Ｌ、２０ｍｇ／Ｌ又は２５ｍｇ／Ｌのポリアクリル酸ナトリウムの検水を１ｍＬ添加した後、塩化ベンゼトニウム５重量％水溶液を約２０μＬスポイトで滴下した。その後、攪拌・反応させて白濁を生じさせ、波長５２５ｎｍで可視光線の吸光度測定を行い、吸光度とポリアクリル酸ナトリウム濃度とを各温度毎にグラフにプロットした。この結果を図２に示す。また、図２の中で調整ポリマー濃度が２５ｍｇ／Ｌのときの各温度の吸光度を表１に示す。
<Example 1>
A polystyrene measurement cell having an optical path length of 10 mm, an optical path width of 10 mm, a height of 45 mm, and an outer width of 12.5 mm was encapsulated with 1.5 mL of an EDTA 0.7 wt% aqueous solution. After adding 1 mL of 5 mg / L, 10 mg / L, 15 mg / L, 20 mg / L or 25 mg / L sodium polyacrylate test water adjusted to 5 ° C., 15 ° C. or 35 ° C. A 5% by weight aqueous solution of benzethonium was added dropwise with an about 20 μL dropper. Thereafter, the mixture was stirred and reacted to cause white turbidity, and the absorbance of visible light was measured at a wavelength of 525 nm, and the absorbance and the sodium polyacrylate concentration were plotted on a graph for each temperature. The result is shown in FIG. Further, Table 1 shows the absorbance at each temperature when the adjusted polymer concentration is 25 mg / L in FIG.
＜比較例１＞
２５℃に調整した、５ｍｇ／Ｌ、１０ｍｇ／Ｌ、１５ｍｇ／Ｌ、２０ｍｇ／Ｌ又は２５ｍｇ／Ｌのポリアクリル酸ナトリウムの検水のみを用いて、実施例１と同様に検量線を作製した。この検量線における調整ポリマー濃度が２５ｍｇ／Ｌのときの吸光度を表１に示す。
<Comparative Example 1>
A calibration curve was prepared in the same manner as in Example 1 using only 5 mg / L, 10 mg / L, 15 mg / L, 20 mg / L or 25 mg / L sodium polyacrylate test water adjusted to 25 ° C. Table 1 shows the absorbance when the adjusted polymer concentration in the calibration curve is 25 mg / L.
表１より明らかなように、検水の温度によらず、２５℃で作製した検量線で濃度換算する比較例１では、例えば、検水温度が５℃の場合、吸光度を元に検量線で換算した測定値は１５％以上（（１．３７−１．１３）／１．３７ ×１００＝１７．５）の乖離が見られることが分かる。
これに対して、実施例１では、各検水の温度を測定し、その温度に応じた検量線を適用するため、検量線が温度によって異なる場合や、定量的な温度補正が適用できない測定対象であっても、精度良く溶存成分の濃度を換算できる。
As is clear from Table 1, in Comparative Example 1 in which the concentration is converted using a calibration curve prepared at 25 ° C., regardless of the temperature of the sample water, for example, when the sample temperature is 5 ° C., the calibration curve is based on the absorbance. It can be seen that the converted measurement value shows a divergence of 15% or more ((1.37-1.13) /1.37×100=17.5).
On the other hand, in Example 1, the temperature of each test water is measured, and a calibration curve corresponding to the temperature is applied. Therefore, when the calibration curve varies depending on the temperature, or a measurement object to which quantitative temperature correction cannot be applied. Even so, the concentration of the dissolved component can be accurately converted.
＜比較例２＞
光路長１０ｍｍ、光路幅１０ｍｍ、高さ４５ｍｍ、外幅１２．５ｍｍのポリスチレン製の測定セルに、硫酸８重量％、七モリブデン酸六アンモニウム四水和物０．５重量％および酒石酸アンチモニルカリウム０．０５重量％からなるリン酸分析試薬を封入し、温度を２５℃に調整した各濃度のリン酸の検水を１ｍＬ添加した後、アスコルビン酸０．０５ｇを添加し、攪拌、反応させて波長６６０ｎｍの可視光線の吸光度測定を行い、吸光度とリン酸濃度との関係をグラフにプロットして検量線を作成した。
上述の通り作成した検量線をもとに、屋外の現場で種々の温度で求めた実機冷却水のリン酸濃度の測定値（従来例）をＪＩＳ法による測定値と比較した結果を図３に示す。従来法とＪＩＳ法との相関係数は０．９４であった。
<Comparative example 2>
In a measurement cell made of polystyrene having an optical path length of 10 mm, an optical path width of 10 mm, a height of 45 mm, and an outer width of 12.5 mm, 8% by weight of sulfuric acid, 0.5% by weight of hexaammonium heptamolybdate tetrahydrate, and
Based on the calibration curve created as described above, the measured value (conventional example) of the actual cooling water phosphoric acid concentration obtained at various temperatures in the outdoor field is compared with the measured value by the JIS method in FIG. Show. The correlation coefficient between the conventional method and the JIS method was 0.94.
＜実施例２＞
５℃、１５℃、２５℃、３５℃の各温度において、比較例１と同様に１０ｍｇ−ＰＯ４ ３−／Ｌのリン酸溶液について測定した際の、吸光度の経時変化を図４に示す。図４より、吸光度は時間の経過とともに増加した後、一定の反応時間で安定した吸光度を維持すること、および温度が異なると安定する吸光度が異なることが確認された。
<Example 2>
FIG. 4 shows the change in absorbance over time when the 10 mg-PO 4 3− / L phosphoric acid solution was measured in the same manner as in Comparative Example 1 at each temperature of 5 ° C., 15 ° C., 25 ° C., and 35 ° C. From FIG. 4, it was confirmed that after the absorbance increased with time, the stable absorbance was maintained for a certain reaction time, and the stable absorbance was different at different temperatures.
そこで、図４において、反応時間が１０分の時点を１００％として、再プロットしたものを図５に示す。
図５より明らかなように、例えば、検水の温度が５℃のときであれば、吸光度が安定するには８分必要であるが、２５℃であれば４分でほぼ安定する。
この結果から、サンプル水温を測定し、その温度に対する吸光度が安定するに要する時間を選択すれば、反応時間を、例えば８分から４分へと短縮することが可能であることが確認できた。
Therefore, FIG. 5 shows a replotted graph with the reaction time of 10 minutes as 100% in FIG.
As is clear from FIG. 5, for example, when the temperature of the test water is 5 ° C., it takes 8 minutes for the absorbance to be stable, but when it is 25 ° C., it becomes almost stable in 4 minutes.
From this result, it was confirmed that the reaction time can be shortened from, for example, 8 minutes to 4 minutes by measuring the sample water temperature and selecting the time required for the absorbance to stabilize at that temperature.
更に、図４において、温度が異なると安定する吸光度が異なることから、吸光度の読み取りタイミングに加え、使用する検量線を変更させた際のＪＩＳ法との比較結果を図６に示す。このときの相関係数は０．９９９となった。 Furthermore, in FIG. 4, since the stable absorbance differs depending on the temperature, in addition to the absorbance reading timing, the comparison result with the JIS method when the calibration curve to be used is changed is shown in FIG. The correlation coefficient at this time was 0.999.
図６と図３の比較から、本発明法によりリン酸分析値の信頼性が著しく改善されたことが明らかである。また、温度が高い検水については反応時間の短縮に伴い、吸光度の読み込みタイミングを早めた結果、検量線の換算値を得る時間が半分にまで短縮できた。 From the comparison between FIG. 6 and FIG. 3, it is clear that the reliability of the phosphoric acid analysis value is remarkably improved by the method of the present invention. In addition, with respect to the test water having a high temperature, as a result of shortening the reaction time with the shortening of the reaction time, the time for obtaining the converted value of the calibration curve could be reduced to half as a result.
以上より、本発明によれば、測定精度の向上と測定時間の短縮を図ることができることが分かる。 From the above, it can be seen that according to the present invention, it is possible to improve the measurement accuracy and shorten the measurement time.
１ 吸光度測定部
２ 温度測定部
３ Ａ／Ｄ交換器
４ 演算部
５ 記憶部
６ 表示部
７ 入力部
１０ コンピュータ
DESCRIPTION OF SYMBOLS 1
Claims (6)
使用する検量線、
及び／又は
透過率又は吸光度の読み込みタイミング
を変更するように設定されていることを特徴とする水中の溶存成分濃度の測定装置。 Stores information including change over time in transmittance or absorbance when irradiated with visible light for a plurality of standard sample waters with different concentrations of dissolved components to be measured. Based on this stored data , A device for measuring dissolved component concentration in water by an absorptiometric method for determining the dissolved component concentration of unknown sample water, based on the temperature of the unknown sample water,
Calibration curve to use,
And / or a measuring device for measuring the concentration of dissolved components in water, wherein the reading timing of transmittance or absorbance is set to be changed.
使用する検量線、
及び／又は
透過率又は吸光度の読み込みタイミング
を変更することを特徴とする水中の溶存成分濃度の測定方法。 Stores information including change over time in transmittance or absorbance when irradiated with visible light for a plurality of standard sample waters with different concentrations of dissolved components to be measured. Based on this stored data , A method for measuring the concentration of dissolved components in water by an absorptiometric method for determining the concentration of dissolved components in unknown sample water, based on the temperature of the unknown sample water,
Calibration curve to use,
And / or a method for measuring the concentration of dissolved components in water, wherein the reading timing of transmittance or absorbance is changed.
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