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利用锌粒除去干扰元素铜离子的硝酸介质的锌浸液中,加入已知量且过量的AgNO3标准溶液,根据硫氰根离子与过量银离子生成硫氰酸银沉淀,以铁铵矾为指示剂,间接测定样品中的氯离子的含量。按此试验方法测定了七个浸液样品,并进行了加标回收试验,同时与汞量法进行了试验比较,测定结果基本一致。佛尔哈德法的处理简单、快速、选择性高,准确度和重现性均较好,可满足浸液中氯离子测定的要求。
Using zinc particles to remove interfering elements of copper ions in the nitric acid medium zinc immersion, adding a known amount and excessive amount of AgNO3 standard solution, according to thiocyanate ions and excess silver ions to form silver thiocyanate precipitation, ammonium ferric ammonium as an indicator Agent, indirect determination of chloride ion content in the sample. According to the test method, seven samples of immersion liquid were measured and the spiked recovery test was carried out. At the same time, compared with the mercury amount method, the test results were basically the same. The Faulhard method has the advantages of simple, fast, high selectivity, good accuracy and reproducibility, which can meet the requirements of chloride ion determination in immersion liquid.