MEASURING METHOD OF ORGANIC SUBSTANCE CONCENTRATION IN SAMPLE LIQUID, AND ULTRAVIOLET ABSORBANCE MEASURING DEVICE

摘要

PROBLEM TO BE SOLVED: To measure accurately an organic substance concentration in sample liquid by removing accurately an influence of a turbidity component. SOLUTION: When measuring the organic substance concentration in the sample liquid by determining a corrected ultraviolet absorbance AaUV(AaUV=AMUV-αAMVIS) by multiplying a visible light absorbance (AmVIS) acquired by measurement of the sample liquid by a coefficientα(α=SUV/SVIS) determined from the ratio between a turbidity detection sensitivity (SUV) of an ultraviolet ray used for measurement and a turbidity detection sensitivity (SVIS) of visible light, and by subtracting the value from an ultraviolet absorbance (AmUV) acquired by measurement of the sample liquid, the coefficientαis calculated following the equation (1):α=(AdUV-AfUV)/(AdVIS-AfVIS), wherein AdUVis the ultraviolet absorbance of the sample liquid, AdVISis the visible light absorbance of the sample liquid, AfUVis the ultraviolet absorbance of a filtrate from the sample liquid, and AfVISis the visible light absorbance of a filtrate from the sample liquid. COPYRIGHT: (C)2009,JPO&INPIT