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铅基合金及铅青铜中铅的络合滴定,一般采用硫酸铅重量法、铬酸铅容量法或电解法.这些方法分析时间较长.按??雅齐米尔斯基,在过量硫代硫酸盐存在下,以氯化六氨钴沉淀铅离子(过量的硫代硫酸盐用碘量法测得).此法虽速度较快,但误差较大.文献用络合滴定法,以氰化钾掩蔽杂质的干扰,终点及灵敏度较高.我们认为,在大量分析中,采用剧毒试剂是不适宜的.在这个问题上,有人采用从干扰元素中把铅沉淀出来进行络合滴定,但手续较复杂.我们针对上述缺点进行改进,做了铅基合金、铅青铜(用作填料,包括含锑填料)中铅的络合滴定试验,应用效果较为满意.现介绍如下.
Lead-based alloys and lead bronze complexation titration of lead, the general use of lead sulfate gravimetric method, lead chromate capacity or electrolysis method. Analysis of these methods for a long time. According to ?? Ya-Qi Miersi Ji, in excess of thiosulfate In the presence of salt, the precipitation of lead ions with hexamine cobalt chloride (excess thiosulfate measured by iodometry.) Although this method is faster, but the error is larger.Comparative literature titration with cyanidation Potassium interception of impurities, endpoints and high sensitivity of potassium.We believe that in a large number of analysis, the use of highly toxic reagents is not appropriate.In this issue, it was used to interfere with the elements from the precipitation of lead complexation titration, but The procedures are more complex.We made improvements to the above shortcomings, made a lead-based alloy, lead bronze (used as a filler, including antimony filler) complexation titration of lead, the application effect is satisfactory.