次磷酸钠中氯化物的测定方法改良  

Improvement of the Determination Method for Chloride in Sodium Hypophosphate

作　　者：李红 杜建侠 荣沙沙 肖清燕 卢会珍 余晓英 彭钰婕 Li Hong;Du Jianxia;Rong Shasha;Xiao Qingyan;Lu Huizhen;Yu Xiaoying;Peng Yujie(Hubei Three Gorges Laboratory,Yichang 443000,China)

机构地区：[1]湖北三峡实验室,湖北宜昌443000

出　　处：《山东化工》2024年第6期164-167,共4页Shandong Chemical Industry

摘　　要：在HG/T 3253—2009工业次磷酸钠的标准中,氯化物的测定采用硝酸银电位滴定法,但在滴定过程中笔者发现电位值波动较大极不稳定,无法辨别突跃值判定终点。本文简单讲述了电位值不稳定的原因,提出了改良办法。改良后的方法仍以硝酸银标准滴定溶液为滴定剂,根据电位突跃值确定滴定终点。实验结果表明,改良后的方法在测定过程中溶液分散,电位值稳定、突跃现象明显,结果准确,且可减少试剂的消耗。In the HG/T3253-2009 standard for industrial sodium hypophosphate,the determination of chlorides is carried out using the silver nitrate potentiometric titration method.However,during the titration process,the author found that the potential value fluctuated greatly and was extremely unstable,making it difficult to distinguish the endpoint of the sudden jump value.This article briefly discusses the reasons for unstable potential values and proposes improvement methods.The improved method still uses silver nitrate standard titration solution for titration,and the titration endpoint is determined based on the potential jump.The experimental results show that the improved method disperses the solution during the measurement process,stabilizes the potential value,exhibits obvious sudden jumps,and provides accurate results.It can also reduce the consumption of reagents.

关 键 词：硝酸 电位值 分散 突跃 

分 类 号：O652.1[理学—分析化学]