JP5013000B2 - UV absorbance measuring device - Google Patents

UV absorbance measuring device Download PDF

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JP5013000B2
JP5013000B2 JP2010517614A JP2010517614A JP5013000B2 JP 5013000 B2 JP5013000 B2 JP 5013000B2 JP 2010517614 A JP2010517614 A JP 2010517614A JP 2010517614 A JP2010517614 A JP 2010517614A JP 5013000 B2 JP5013000 B2 JP 5013000B2
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JPWO2009157057A1 (en
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良英 神吉
亨久 板橋
博司 村上
正晃 菊竹
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Shimadzu Corp
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
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    • G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
    • G01N21/33—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using ultraviolet light
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
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    • G01N21/05—Flow-through cuvettes
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/01—Arrangements or apparatus for facilitating the optical investigation
    • G01N21/15—Preventing contamination of the components of the optical system or obstruction of the light path
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
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    • G01N33/1893—Water using flow cells
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/01—Arrangements or apparatus for facilitating the optical investigation
    • G01N21/15—Preventing contamination of the components of the optical system or obstruction of the light path
    • G01N2021/152—Scraping; Brushing; Moving band

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Description

本発明は、試料水中に存在する有機汚濁物質量（濃度）を測定する紫外線吸光度測定装置に関するものである。   The present invention relates to an ultraviolet absorbance measuring apparatus for measuring the amount (concentration) of organic pollutants present in sample water.

例えば河川水や排水の水質分析を行なうために、試料水中の有機汚濁物質量を紫外線吸光度を利用して測定する紫外線吸光度測定装置がよく用いられる。紫外線吸光度測定装置は、試料水を流通させたフローセルに紫外線を照射してその吸光度を測定することにより試料水に含まれる有機物の定量を行なうものである。   For example, in order to perform water quality analysis of river water and wastewater, an ultraviolet absorbance measuring device that measures the amount of organic pollutants in sample water using ultraviolet absorbance is often used. The ultraviolet absorbance measurement apparatus quantifies organic substances contained in sample water by irradiating the flow cell in which the sample water is passed with ultraviolet rays and measuring the absorbance.

紫外線吸光度測定装置では、試料水として河川水や排水などをくみ上げてフローセルを流通させるため、フローセルの壁面に有機物や浮遊物が付着して光透過性が悪くなり、紫外線吸光度測定に影響を与える。そこで、フローセル内の汚れをワイパーなどを用いて除去する洗浄機構を装置に設けることが提案されている（例えば、特許文献１参照。）。
特公平６−５８３２３号公報 In the ultraviolet absorbance measurement device, river water or drainage is drawn up as sample water and circulated through the flow cell. Therefore, organic matter or suspended matter adheres to the wall surface of the flow cell, resulting in poor light transmission, which affects ultraviolet absorbance measurement. Therefore, it has been proposed to provide the apparatus with a cleaning mechanism that removes dirt in the flow cell using a wiper or the like (see, for example, Patent Document 1).
Japanese Patent Publication No. 6-58323

しかし従来の紫外線吸光度測定装置は、常時フローセルに試料水を供給し続けて測定することを前提としており、フローセルへの試料水の供給を一旦停止してから後に測定を再開するといった断続的な測定は想定していない。そのため、従来の装置では、フローセルへの試料水の供給が停止した後もそのまま測定が行なわれてしまう。   However, the conventional UV absorbance measurement device is based on the premise that the sample water is continuously supplied to the flow cell for measurement, and the intermittent measurement is such that the supply of the sample water to the flow cell is stopped and then the measurement is restarted. Is not assumed. Therefore, in the conventional apparatus, the measurement is performed as it is even after the supply of the sample water to the flow cell is stopped.

試料水の供給を停止した場合、フローセル内の試料水が流通しないためにフローセルの壁面に試料水による汚れが付着しやすくなり、その状態で時間が経過するとその汚れが洗浄によっても取れなくなってしまうことがある。また、試料水の供給を停止して試料水を全て排出してフローセルを空の状態にしていると、フローセルの壁面に付着した汚れが乾燥して取れなくなってしまうことがある。   When the sample water supply is stopped, the sample water in the flow cell does not circulate, so that the sample water easily adheres to the wall surface of the flow cell, and after that time, the stain cannot be removed by washing. Sometimes. In addition, when the supply of sample water is stopped and all the sample water is discharged to make the flow cell empty, dirt attached to the wall surface of the flow cell may be dried and cannot be removed.

そこで本発明は、紫外線吸光度測定を中断しても、その中断中にフローセルの壁面が試料水によって汚れないようにすることを目的とするものである。   Therefore, the present invention aims to prevent the wall of the flow cell from being contaminated by sample water even when the UV absorbance measurement is interrupted.

本発明の紫外線吸光度測定装置は、フローセルと、フローセルに接続され、フローセルに試料水及び純水のいずれか一方を選択的に切り替えて供給することができる試料水・純水供給部と、フローセルからの排水を制御する排水制御部と、フローセルに対して紫外線を照射するための光源と、フローセルを透過した紫外線を検出する光検出器を含んで、光検出器の光検出量に基づいて試料水の紫外線吸光度を測定する測定演算部と、フローセル内を洗浄する洗浄機構と、測定時はフローセル内で試料水を流通させ、測定終了後は試料水の供給を停止してフローセルを洗浄機構で洗浄するとともに、次回の測定開始時までの測定中断中はフローセル内を純水で満たしておく動作を含んで、試料水・純水供給部、排水制御部、光源、測定演算部及び洗浄機構の動作を制御する制御部と、を備えたものである。 The ultraviolet absorbance measuring apparatus of the present invention includes a flow cell, a sample water / pure water supply unit that is connected to the flow cell and can selectively supply either sample water or pure water to the flow cell, and a flow cell. A drainage control unit for controlling the drainage of the water, a light source for irradiating the flow cell with ultraviolet rays, and a photodetector for detecting the ultraviolet rays that have passed through the flow cell, and the sample water based on the light detection amount of the photodetector Measurement unit that measures the UV absorbance of water, a cleaning mechanism that cleans the inside of the flow cell, sample water is circulated in the flow cell at the time of measurement, and the sample water is stopped after measurement and the flow cell is cleaned by the cleaning mechanism while, during measurement interruptions until the next measurement starts include operations to be met in the flow cell with pure water, the sample water-pure water supply unit, the discharge control unit, a light source, measurement calculation unit及A control unit for controlling the operation of the cleaning mechanism, in which provided with.

本発明の紫外線吸光度測定装置においては、制御部は、測定開始時にフローセル内の洗浄を行なう動作も行なうことが好ましい。そうすれば、測定の中断中にフローセルが純水で満たされることによって落ちやすくなったフローセル壁面の汚れを測定開始時に落とすことができ、より正確な紫外線吸光度測定を行なうことができるようになる。   In the ultraviolet absorbance measurement apparatus of the present invention, it is preferable that the control unit also performs an operation of cleaning the flow cell at the start of measurement. If it does so, the stain | pollution | contamination of the flow cell wall surface which became easy to fall by filling a flow cell with a pure water during the interruption of a measurement can be removed at the time of a measurement start, and a more exact ultraviolet light absorbency measurement can be performed now.

測定時間に関する情報を入力して測定に関する時間を設定することができる測定時間設定部をさらに備えていてもよく、その場合には、制御部が、測定時間設定部に設定されている設定時間に基づいて試料水・純水供給部、排水制御部、光源、測定演算部及び洗浄機構の動作を制御する。ここでの「測定に関する時間」とは測定の開始時間や終了時間などである。制御部による動作制御がこれらの設定時間に基づいて行なわれるようになっていれば、測定者は各動作の時間を測定時間設定部に設定しておくだけでその設定時間に従って装置が自動的にその動作を行なうので、測定者が測定現場で測定の開始、終了、再開などの指示をその都度装置に指示する必要がなくなる。   It may further include a measurement time setting unit that can input information related to the measurement time and set the time related to the measurement. In this case, the control unit sets the set time set in the measurement time setting unit. Based on this, the operation of the sample water / pure water supply unit, drainage control unit, light source, measurement calculation unit, and cleaning mechanism is controlled. Here, “time related to measurement” refers to the start time and end time of measurement. If operation control by the control unit is performed based on these set times, the measurer simply sets the time of each operation in the measurement time setting unit, and the device automatically follows the set time. Since the operation is performed, it is not necessary for the measurer to instruct the apparatus to start, end, or restart the measurement at the measurement site.

本発明の紫外線吸光度測定装置は、フローセル、試料水・純水供給部、排水制御部、光源、測定演算部、洗浄機構及び制御部を備えたものであって、測定終了後は試料水の供給が停止されてフローセルが洗浄機構で洗浄されるとともにフローセル内が純水で満たされるようになっているので、測定の中断中にフローセルが試料水で汚れることがなく、測定を中断することができ、再開後の測定も高精度に行なうことができる。   The ultraviolet absorbance measurement apparatus of the present invention includes a flow cell, a sample water / pure water supply unit, a drainage control unit, a light source, a measurement calculation unit, a cleaning mechanism, and a control unit. Since the flow cell is cleaned by the cleaning mechanism and the flow cell is filled with pure water, the flow cell is not contaminated with sample water during measurement interruption, and measurement can be interrupted. The measurement after resumption can be performed with high accuracy.

紫外線吸光度測定装置の一実施例を概略的に示すブロック図である。It is a block diagram which shows roughly one Example of an ultraviolet light absorbency measuring apparatus. 同実施例の紫外線吸光度測定装置の動作を示すフローチャートである。It is a flowchart which shows operation | movement of the ultraviolet-ray-absorbance measuring apparatus of the Example. 同実施例の洗浄機構の一例を示す概略構成図である。It is a schematic block diagram which shows an example of the washing | cleaning mechanism of the Example.

符号の説明Explanation of symbols

２ フローセル
４ 光源
６ 光測定部
８ 光検出器
１０ 演算部
１２ フローセル入口
１４ 試料水・純水供給部
１６ 流路切替バルブ
１８ 試料水供給流路
２０ 純水供給流路
２２ 活性炭フィルタ
２４ 純水タンク
２６ ポンプ
２８ 排水制御部
３０ 洗浄機構
３０ａ ワイパー
３０ｂ モータ
３０ｃ 移動機構
３２ 制御部
３４ 操作入力部
３６ 測定時間設定部2 Flow Cell 4 Light Source 6 Optical Measurement Unit 8 Photodetector 10 Calculation Unit 12 Flow Cell Inlet 14 Sample Water / Pure Water Supply Unit 16 Channel Switch Valve 18 Sample Water Supply Channel 20 Pure Water Supply Channel 22 Activated Carbon Filter 24 Pure Water Tank 26 pump 28 drainage control unit 30 cleaning mechanism 30a wiper 30b motor 30c moving mechanism 32 control unit 34 operation input unit 36 measurement time setting unit

図１は紫外線吸光度測定装置の一実施例を概略的に示すブロック図である。
試料水を流通させるフローセル２に対して紫外線を照射するように紫外光源４がフローセル２の側方に配置されており、フローセル２を挟んで光源４の反対側にフローセル２を通過した紫外線を検出する光検出器８及び光検出器８の検出量に基づいてフローセル２内を流通する試料の紫外線吸光度を求める演算部１０からなる光測定部６が配置されている。FIG. 1 is a block diagram schematically showing an embodiment of an ultraviolet absorbance measuring apparatus.
An ultraviolet light source 4 is arranged on the side of the flow cell 2 so as to irradiate the flow cell 2 through which sample water is circulated, and the ultraviolet light that has passed through the flow cell 2 is detected on the opposite side of the light source 4 across the flow cell 2. A light measuring unit 6 is provided that includes a light detector 8 and a calculation unit 10 that obtains the ultraviolet absorbance of a sample flowing in the flow cell 2 based on the detection amount of the light detector 8.

フローセル２の入口１２には試料水・純水供給部１４が接続されている。試料水・純水供給部１４は試料水を供給する試料水供給流路１８と純水を供給する純水供給流路２０とを流路切替バルブ１６を介して入口１２に接続する構造をもつ。この実施例において純水供給流路２０から供給される純水とは活性炭素フィルタ２２を通した水道水である。純水はいったん純水タンク２４に貯留され、純水タンク２４からポンプ２６によって汲み上げられる。流路切替バルブ１６の切替えにより、試料水と純水のいずれか一方を入口１２側へ供給することができる。また、流路切替バルブ１６を純水側にした状態でポンプ２６を停止することにより両方の供給を停止することができる。   A sample water / pure water supply unit 14 is connected to the inlet 12 of the flow cell 2. The sample water / pure water supply unit 14 has a structure in which a sample water supply channel 18 for supplying sample water and a pure water supply channel 20 for supplying pure water are connected to the inlet 12 via a channel switching valve 16. . In this embodiment, the pure water supplied from the pure water supply channel 20 is tap water that has passed through the activated carbon filter 22. The pure water is once stored in the pure water tank 24 and pumped up from the pure water tank 24 by the pump 26. By switching the flow path switching valve 16, either sample water or pure water can be supplied to the inlet 12 side. Moreover, both supply can be stopped by stopping the pump 26 in the state which made the flow-path switching valve 16 into the pure water side.

フローセル２の出口は開閉弁からなる排水制御部２８によって開閉されるように構成されている。
また、フローセル２内を洗浄するための洗浄機構３０が設けられている。洗浄機構３０は、例えば、図３に示されているように、ワイパー３０ａと、モータ３０ｂによって駆動されてワイパー３０ａを移動させる移動機構３０ｃを備え、ワイパー３０ａをフローセル２の壁面に接触させながら上下方向に移動させることによってフローセル２の壁面の汚れを物理的に落とすものである。移動機構３０ｃとしては、モータ３０ｂによって回転される棒ネジと、棒ネジと螺合し、棒ネジが回転することにより棒ネジの軸方向に移動する駆動部とを備えたものである。ワイパー３０ａの基端部は棒ネジ上を移動する駆動部に固定されている。洗浄機構３０はさらに洗浄液をフローセル２に供給する機能も備えていてもよい。The outlet of the flow cell 2 is configured to be opened and closed by a drainage control unit 28 including an on-off valve.
Further, a cleaning mechanism 30 for cleaning the inside of the flow cell 2 is provided. For example, as shown in FIG. 3, the cleaning mechanism 30 includes a wiper 30 a and a moving mechanism 30 c that is driven by a motor 30 b to move the wiper 30 a, and moves the wiper 30 a up and down while contacting the wall surface of the flow cell 2. The dirt on the wall surface of the flow cell 2 is physically removed by moving in the direction. The moving mechanism 30c includes a bar screw that is rotated by the motor 30b, and a drive unit that is screwed with the bar screw and moves in the axial direction of the bar screw when the bar screw rotates. The base end portion of the wiper 30a is fixed to a drive unit that moves on a bar screw. The cleaning mechanism 30 may further have a function of supplying a cleaning liquid to the flow cell 2.

光源４、光測定部６、試料水・純水供給部１４、排水制御部２８及び洗浄機構３０の各動作は制御部３２によって制御される。制御部３２は操作入力部３４を介して入力された測定者からの指示に基づいた制御を行なうほか、タイマーを備えた測定時間設定部３６において測定に関する時間が設定されている場合にはその設定時間になったときに特定の制御を行なうように構成されている。測定に関する時間とは、例えば測定開始時間、測定終了時間である。   Each operation of the light source 4, the light measurement unit 6, the sample water / pure water supply unit 14, the drainage control unit 28, and the cleaning mechanism 30 is controlled by the control unit 32. The control unit 32 performs control based on an instruction from the measurer input via the operation input unit 34. In addition, when a time related to measurement is set in the measurement time setting unit 36 including a timer, the setting is performed. It is configured to perform specific control when it is time. The measurement time is, for example, a measurement start time or a measurement end time.

図２はこの実施例の紫外線吸光度測定装置の動作の一例を示すフローチャートである。図２に基づいてこの実施例の装置の動作を説明する。
測定者は操作入力部３４を介して制御部３２に測定開始を指示するか、測定開始時間や測定終了時間といった測定に関する時間を測定時間設定部３６に設定しておくことができる（ステップＳ１）。測定開始時間が設定されている場合、測定時間設定部３６は測定開始時間になると制御部３２に信号を送信し、制御部３２はその信号を受けて測定動作の制御を行なう（ステップＳ２）。測定開始時間が設定されていない場合には、測定者が操作入力部３４を介して測定開始の指示を入力することによって制御部が測定動作の制御を行なう（ステップＳ３）。なお、この測定開始前の時点のフローセル２内は、後述するステップＳ１２の動作により、純水で満たされた状態となっている。FIG. 2 is a flowchart showing an example of the operation of the ultraviolet absorbance measuring apparatus of this embodiment. The operation of the apparatus of this embodiment will be described with reference to FIG.
The measurer can instruct the control unit 32 to start measurement via the operation input unit 34, or can set the measurement time setting unit 36 with respect to measurement such as measurement start time and measurement end time (step S1). . When the measurement start time is set, the measurement time setting unit 36 transmits a signal to the control unit 32 when the measurement start time is reached, and the control unit 32 receives the signal and controls the measurement operation (step S2). If the measurement start time is not set, the measurement unit inputs a measurement start instruction via the operation input unit 34, and the control unit controls the measurement operation (step S3). The flow cell 2 before the start of the measurement is filled with pure water by the operation of step S12 described later.

測定開始時間になるか（ステップＳ２）又は測定者からの測定開始の指示が入力される（ステップＳ３）と、純水で満たされたフローセル２内を洗浄機構３０によって洗浄する（ステップＳ４）。その後、フローセル２の出口を開放して純水をフローセル２から排出し、試料水・純水供給機構１４から試料水を供給し（ステップＳ６）、紫外線吸光度の測定を開始する（ステップＳ７）。測定が開始されると、フローセル２に対して光源４から紫外線が照射され、フローセル２を通過した紫外線は光検出器８で受光される。光検出器８は受光した紫外線量に相当する信号を演算部１０へ送信し、演算部１０はその信号に基づいてフローセル２内の試料水の紫外線吸光度を算出する。   When the measurement start time is reached (step S2) or an instruction to start measurement is input from the measurer (step S3), the inside of the flow cell 2 filled with pure water is cleaned by the cleaning mechanism 30 (step S4). Thereafter, the outlet of the flow cell 2 is opened, pure water is discharged from the flow cell 2, sample water is supplied from the sample water / pure water supply mechanism 14 (step S6), and measurement of ultraviolet absorbance is started (step S7). When the measurement is started, the flow cell 2 is irradiated with ultraviolet rays from the light source 4, and the ultraviolet rays that have passed through the flow cell 2 are received by the photodetector 8. The photodetector 8 transmits a signal corresponding to the amount of received ultraviolet light to the calculation unit 10, and the calculation unit 10 calculates the ultraviolet absorbance of the sample water in the flow cell 2 based on the signal.

測定時間設定部３６に測定終了時間が設定されている場合はその時間まで測定を行ない、測定時間になったときに測定時間設定部３６が制御部３２に信号を送信し、制御部３２はその信号を受けて測定を終了するための動作制御を行なう（ステップＳ８，Ｓ９）。測定時間設定部３６に測定終了時間が設定されていない場合には、測定者が測定終了の指示を入力するまで測定を行ない、測定者による測定終了の指示が入力されたときに制御部３２が測定終了の動作制御を行なう（ステップＳ８，Ｓ１０）。   When the measurement end time is set in the measurement time setting unit 36, measurement is performed up to that time, and when the measurement time is reached, the measurement time setting unit 36 transmits a signal to the control unit 32, and the control unit 32 In response to the signal, operation control for ending the measurement is performed (steps S8 and S9). When the measurement end time is not set in the measurement time setting unit 36, measurement is performed until the measurer inputs a measurement end instruction, and when the measurement end instruction is input by the measurer, the control unit 32 Operation control for the end of measurement is performed (steps S8 and S10).

測定終了時間になるか又は測定者によって測定終了の指示が入力されると、制御部３２によって紫外線吸光度測定は中断される。制御部３２はフローセル２内の試料水を全て排出する。その後、試料水・純水供給部１４から純水を供給し、洗浄機構３０によってフローセル２内の洗浄を行ない（ステップＳ１１）、さらにはフローセル２の出口を排水制御部２８によって閉じることによりフローセル２を純水で満たした後（ステップＳ１２）、ポンプ２６を停止する。その後、測定中断中はフローセル２内が純水で満たされたままで維持される。   When the measurement end time is reached or a measurement end instruction is input by the measurer, the UV absorbance measurement is interrupted by the control unit 32. The control unit 32 discharges all the sample water in the flow cell 2. Thereafter, pure water is supplied from the sample water / pure water supply unit 14, the inside of the flow cell 2 is cleaned by the cleaning mechanism 30 (step S 11), and the outlet of the flow cell 2 is closed by the drainage control unit 28. Is filled with pure water (step S12), and the pump 26 is stopped. Thereafter, the flow cell 2 is kept filled with pure water while the measurement is interrupted.

なお、紫外線吸光度測定終了後に純水でフローセル２を純水で満たして洗浄を行なった後で、一旦その純水を排出してから再度フローセル２を純水で満たすようにしてもよい。そうすれば、洗浄によって発生した汚れが純水供給前にフローセル２外へ排出されるため、それらの汚れが紫外線吸光度測定の中断中にフローセル２の壁面に再付着することを防止できる。なお、その場合には、紫外線吸光度測定開始前の洗浄（ステップＳ４）を省略することも可能である。   Alternatively, after completion of the UV absorbance measurement, the flow cell 2 may be filled with pure water and washed, and then the pure water may be discharged and the flow cell 2 filled with pure water again. If it does so, since the dirt which generate | occur | produced by washing | cleaning will be discharged | emitted out of the flow cell 2 before pure water supply, it can prevent that those dirt adheres to the wall surface of the flow cell 2 during the interruption | blocking of an ultraviolet light absorbency measurement. In this case, it is possible to omit the cleaning (step S4) before starting the UV absorbance measurement.

以上のように、この実施例の紫外線吸光度測定装置は、紫外線吸光度測定の終了時から次の測定開始時までの測定中断中はフローセル２内が純水で満たされた状態となるので、フローセル２内が試料水によって汚れたり乾燥によって汚れが取れなくなってしまったりするなどの問題を防止することができる。   As described above, in the ultraviolet absorbance measuring apparatus of this embodiment, the flow cell 2 is filled with pure water during the measurement interruption from the end of the ultraviolet absorbance measurement to the start of the next measurement. It is possible to prevent problems such as contamination of the inside by sample water or removal of dirt by drying.

Claims (3)

フローセルと、
前記フローセルに接続され前記フローセルに試料水及び純水のいずれか一方を切り替えて供給することができる試料水・純水供給部と、
前記フローセルからの排水を制御する排水制御部と、
前記フローセルに対して紫外線を照射するための光源と、
前記フローセルを透過した紫外線を検出する光検出器を含んで、前記光検出器の光検出量に基づいて試料水の紫外線吸光度を測定する測定演算部と、
前記フローセル内を洗浄する洗浄機構と、
測定時は前記フローセル内で試料水を流通させ、測定終了後は前記試料水の供給を停止してフローセルを前記洗浄機構で洗浄するとともに、次回の測定開始時までの測定中断中はフローセル内を純水で満たしておく動作を含んで、前記試料水・純水供給部、排水制御部、光源、測定演算部及び洗浄機構の動作を制御する制御部と、を備えた紫外線吸光度測定装置。A flow cell;
A sample water / pure water supply unit connected to the flow cell and capable of switching and supplying either sample water or pure water to the flow cell;
A drainage control unit for controlling drainage from the flow cell;
A light source for irradiating the flow cell with ultraviolet rays;
Including a photodetector for detecting ultraviolet rays transmitted through the flow cell, and a measurement calculation unit for measuring the ultraviolet absorbance of the sample water based on the amount of light detected by the photodetector;
A cleaning mechanism for cleaning the inside of the flow cell;
At the time of measurement, sample water is circulated in the flow cell, and after the measurement is finished, the supply of the sample water is stopped and the flow cell is washed by the washing mechanism, while the measurement cell is suspended until the next measurement is started. A UV absorbance measuring apparatus comprising a control unit for controlling operations of the sample water / pure water supply unit, a drainage control unit, a light source, a measurement calculation unit, and a cleaning mechanism, including an operation of filling with pure water. 前記制御部は、測定開始時に前記洗浄機構によるフローセル内の洗浄動作も行なう請求項１に記載の紫外線吸光度測定装置。The ultraviolet absorbance measurement apparatus according to claim 1, wherein the control unit also performs a cleaning operation in the flow cell by the cleaning mechanism at the start of measurement. 測定時間に関する情報を入力して測定に関する時間を設定することができる測定時間設定部をさらに備え、
前記制御部は、前記測定時間設定部に設定されている測定に関する設定時間に基づいて前記試料水・純水供給部、排水制御部、光源、測定演算部及び洗浄機構の動作を制御する請求項１又は２に記載の紫外線吸光度測定装置。It further includes a measurement time setting unit that can input information related to measurement time and set time related to measurement,
The control unit controls operations of the sample water / pure water supply unit, a drainage control unit, a light source, a measurement calculation unit, and a cleaning mechanism based on a set time relating to measurement set in the measurement time setting unit. 3. The ultraviolet absorbance measuring apparatus according to 1 or 2.
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