容量法测定卤水中氯元素干扰扣除方法

Precautions of silver nitrate titration in chlorine analysis of brine

在用矿化度区分的卤水标准体系中,矿化度大于50g·L-1的称为卤水。天然卤水中富含氯、硫酸盐、钾、钠等资源,一般原卤中氯的含量很高。氯元素的分析一般有离子色谱法、容量法、比色法的一些方法。本文讨论的是使用容量法测试卤水中氯元素时需要注意的事项和需要扣除的影响因素。主要影响因素包括指示剂的干扰、其他离子的干扰、滴定度的选择等,进行了离子色谱法的比对验证,结果可靠。本文采用了数学方法与化学方法结合的模式进行了干扰扣除。

In the standard system of distinguishing brine with salinity,the brine whose salinity is greater than 50 grams is called brine.Natural brine is rich in chlorine,sulfate,potassium,sodium and other resources,the content of chlorine in the original brine is very high.The methods of ion chromatography,volumetric method and colorimetric method are commonly used in the analysis of chlorine.This paper discusses the matters needing attention and the factors that need to be deducted when using the volumetric method to test chlorine in brine.The main influencing factors include interference of indicator,interference of other ions,selection of titration degree,etc.a set of reasonable interference deduction formula is established in this paper.