重铬酸盐指数法测定CODcr过程中氯离子干扰的疑问和探讨

The Different Opinions of Chloride Ion’s Interference in the Process of National Standard Method to Determine the CODCr

本文对GB/T 11914-89《水质化学需氧量的测定重铬酸盐指数法》测定化学需氧量时在实验过程中把氯离子作为干扰进行掩蔽提出了疑问。根据GB/T 11914-89《水质化学需氧量的测定重铬酸盐指数法》的定义,氯离子不应成为干扰部分而掩蔽,相反氯离子作为在反应过程中消耗重铬酸盐的还原性物质,应该成为最后计算结果的一部分。因此,在整个测定过程硫酸银不适合作为催化剂,硫酸汞也无需作为掩蔽剂存在,它们会与氯离子产生反应降低计算结果。本文同时也对一些专家在催化剂的替代方面的研究成果进行了综述。

This article have a question of chloride ion＇s interference in the process of CODCr determination with the GB/T 11914-89.Water quality the determination of cod Heavy chromate salt index method.According to the definition,chloride ion should not be interference and masking. Chlorine ion in the reaction process as heavy chromate salt consumption of material, should be part of the calculation results.Meanwhile,mercuric sulfate is not good for most catalyst, it will not only reacts with chloride ions to reduce the calculation result,also can cause the second pollution to the environment.This paper also discussed all sorts of instead of the effect of catalysts.