Method of analyzing chemical substances

Claim 1

A method of analyzing chemical substances in a sample by deriving an absorbance variation with respect to time of a test liquid which is a mixture of a sample liquid and at least one known reagent comprising the step of: delivering a reagent into a first container to form a reagent blank; moving the container containing the reagent successively through a plurality of photometric positions; measuring absorbances of the reagent blank at respective photometric positions; storing the measured absorbances of the reagent blank in a memory; delivering a standard test liquid which is a mixture of a standard sample having a known concentation c and the reagent into a second container moving the second container containing the standard test liquid succesively through the plurality photometric positions; measuring absorbances of the standard test liquid at respective photometric positions; deriving differences between absorbances of the reagent blank measured at at least two photometric positions, and the absorbances of the standard test liquid measured at corresponding photometric positions to produce at least two corrected absorbances of the standard test liquid; deriving an absorbance variation per unit time from a difference between the corrected absorbances of the standard test liquid; calculating a converting coefficient I from said absorbance variation per unit time in the corrected absorbances of the standard test liquid and the known concentration c of the substances in the standard sample; storing the converting coefficient I thus calculated in the memory; delivering a test liquid into a third container; moving the third container containing the test liquid successively through the photometric positions; measuring absorbances of the test liquid at respective photometric positions; deriving differences between the absorbances of the reagent blank measured at at least two photometric positions and the absorbances of the test liquid measured at corresponding photometric positions to produce at least two corrected absorbances of the test liquid;

Claim 2

A method of analyzing chemical substances in a sample by deriving an absorbance variation with respect to time of a test liquid which is a mixture of a sample liquid and at least one known reagent comprising the step of: delivering a reagent into a first container to form a reagent blank; moving the container containing the reagent successively through a plurality of photometric positions; measuring absorbances of the reagent blank at respective photometric positions; storing the measured absorbances of the reagent blank in a memory; delivering a standard test liquid which is a mixture of a standard sample having a known concentation c and the reagent into a second container moving the second container containing the standard test liquid succesively through the plurality photometric positions; measuring absorbances of the standard test liquid at respective photometric positions; deriving differences between absorbances of the reagent blank measured at at least two photometric positions, and the absorbances of the standard test liquid measured at corresponding photometric positions to produce at least two corrected absorbances of the standard test liquid; deriving an absorbance variation per unit time from a difference between the corrected absorbances of the standard test liquid; calculating a converting coefficient I from said absorbance variation per unit time in the corrected absorbances of the standard test liquid and the known concentration c of the substances in the standard sample; storing the converting coefficient I thus calculated in the memory; delivering a test liquid into a third container; moving the third container containing the test liquid successively through the photometric positions; measuring absorbances of the test liquid at respective photometric positions; deriving differences between the absorbances of the reagent blank measured at at least two photometric positions and the absorbances of the test liquid measured at corresponding photometric positions to produce at least two corrected absorbances of the test liquid;