Shimadzu Corporation

Yozo Morita

Takeshi Iharada

Toshihisa Itabashi

A COD conversion equation holding unit in a computing unit of a COD measuring device holds a COD conversion equation that indicates a relationship between total-absorbance that is linearly combined by multiplying an absorbance value at each of a plurality of wavelengths by a weighting factor and a COD value, and a conversion unit finds a converted COD value by using the COD conversion equation, and outputs the resulting value. Preferably, a COD conversion equation calculation unit calculates a COD conversion equation based upon the relationship between the total absorbent and an actual measured COD value in sample water, and a correlation calculation unit finds a correlation with respect to each of a plurality of COD conversion equations calculated by the COD conversion equation calculation unit. In this case, the COD conversion equation holding unit holds the conversion equation having the best correlation among the COD conversion equations calculated by the COD conversion equation calculation unit as a COD conversion equation for the sample water.

COD measuring method and device

In an analyzer, an oxidation reagent is supplied to an oxidation reaction portion, and after organic materials contained in the oxidation reagent are removed by oxidation decomposition, a sample is provided into the oxidation reaction portion to react with the oxidation reagent. An infrared gas analyzing portion starts detecting a peak for analyzing. Thus, even if a concentration of the component to be measured in the sample is low, the concentration can be measured accurately without being disturbed by a concentration of the impurities in the oxidation reagent.

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Kyoto, Japan

Yozo Morita