WATER QUALITY ANALYZER

To fulfill the need to correct increases or decreases in a detection signal due to staining.SOLUTION: Provided is a water quality analyzer for measuring a concentration of a measuring object substance contained in sample water, and the water quality analyzer comprises: a flow cell which has a wall part transmitting light and an internal space surrounded by the wall part and allows the sample water to pass through the internal space; a light source which emits light toward the flow cell; a concentration measuring part which, on the basis of light to be measured from the flow cell when emitting light source light from the light source to the flow cell, measures the concentration of the measuring object substance contained in the sample water, in the state of flowing the sample water to the flow cell; a stain detection part which, on the basis of a light quantity of the light to be measured from the flow cell, measures an optical attenuation due to stain of the flow cell in the state of flowing to the flow cell reference water with a known concentration of the measuring object substance; and a stain correction part which, on the basis of the optical attenuation due to the stain of the flow cell, corrects a measurement result of the concentration of the measuring object substance when flowing the sample water.SELECTED DRAWING: Figure 1 【課題】汚れによる検出信号の増減を補正できることが望ましい。【解決手段】試料水に含まれる測定対象物質の濃度を測定する水質分析装置であって、光を透過する壁部と、壁部に囲まれた内部空間とを有し、試料水が内部空間を通過するフローセルと、フローセルに向けて光を照射する光源と、試料水をフローセルに流した状態で、光源からフローセルに光源光を照射したときのフローセルからの被測定光に基づいて、試料水に含まれる測定対象物質の濃度を測定する濃度測定部と、測定対象物質の濃度が既知の参照水をフローセルに流した状態における、フローセルからの被測定光の光量に基づいて、フローセルの汚れによる光減衰量を検出する汚れ検出部と、フローセルの汚れによる光減衰量に基づいて、試料水を流した時の前記測定対象物質の濃度の測定結果を補正する汚れ補正部とを備える水質分析装置を提供する。【選択図】図１