摘要：

将等份的环境水样分别注射到总有机碳分析仪中的TC和IC反应管内,在高温炉900℃和低温炉150℃的工作条件下使其充分氧化为CO₂和H₂O后,将生成的CO₂分别导入非分散红外检测器中,测定出总碳TC和无机碳IC的浓度。依据TC和IC的计量值,获得TOD的测定量。比较该法与重铬酸钾法测定环境水样COD的结果表明,TOC法的相对误差为0.87%～0.94%,标准偏差为<0.25,而重铬酸钾法的标准偏差为0.53～0.55,其准确度与精密度都令人满意。能适合于环境水样中有机污染物的快速监测。

关键词: 总有机碳, 化学需氧量, 分析

Abstract:

Isometric water samples are injected separately into the TC and IC reaction tubes of the total organic carbon analyzer.When the working conditions of the tower electric muffle furnace is 900 ℃ and the lower one's temperature 150 ℃,they are fully oxidized to form carbon dioxide and water which will be induced separately into the non-disperser infrared detector.Then,the total carbon TC and the inorganic carbon IC concentration will be determined.Based on the TC and IC value,the determination of TOD will be obtained.Compared with the COD_Cr of the determined environment water sample result,the TOC accuracy experiment result indicates the relative error is 0.87%-0.94%,satisfying the GB code sample standard in the accuracy experiment.The TOC standard deviation is under 0.25,which is smaller than the COD standard deviation 0.53-0.55.This measuring method has high accuracy and precision and the results are satisfactory.And this method is suitable for the fast determination of organic pollutants in environment water samples.

中图分类号: 

• X703.1