Patent ID: 6447725
Filing Date: 2002-09-10
Classification: G01N,Y10T

Abstract:
A total organic carbon meter comprising a reaction part at least including a TC oxidative reaction part for converting total carbon in an aqueous sample to CO2, an automatic sample injector for collecting said aqueous sample or ordinary pure water and injecting the same into said reaction part, a sample injection control part for controlling the sample injecting operation of said automatic sample injector, a carrier gas supply part for supplying pure gaseous oxygen or oxygen-containing gas to said reaction part as carrier gas, a CO2 detection part for detecting said CO2 being received from said reaction part with said carrier gas, and a data processing part for processing a detection signal of said CO2 detection part,said total organic carbon meter further comprising: an ultrapure water trap mechanism being provided in a passage between said TC oxidative reaction part of the reaction part and said CO2 detection part for retaining condensed water of water vapor being formed in said TC oxidative reaction part; and a passage for connecting said automatic sample injector with an ultrapure water trap of said ultrapure water trap mechanism to be capable of collecting ultrapure water from said ultrapure water trap and injecting the same into said reaction part, said sample injection control part also controlling an operation of collecting said ultrapure water and ordinary pure water being outside this apparatus and diluting said ordinary pure water with said ultrapure water for preparing a test solution having ultralow carbon concentration and injecting the same into said reaction part, wherein said data processing part comprises a calibration curve part for forming and holding calibration curve data, a carbon concentration calculating part for calculating carbon concentration from said detection signal of said CO2 detection part through said calibration curve. and a dilution magnification calculating part for calculating a dilution magnification for forming a test solution having ultralow carbon concentration by diluting said ordinary pure water with said ultrapure water of said ultrapure water trap from said concentration being calculated by said carbon concentration calculating part in measurement of said ordinary pure water being outside this apparatus, and wherein said sample injection control part controls to collect said ordinary pure water and said ultrapure water in accordance with said dilution magnification being calculated by said dilution magnification calculating part and inject the same into said TC oxidative reaction part.