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少量锡部分固溶于碳化铁中,即改变钢材的伸长强度和硬度,对加工性能十分有害。微量锡通常采用氧化苏木素、邻苯二酚紫等光度法测定,前者干扰因素多,条件苛刻,不易得到准确的结果;后者需用甲苯萃取,氢氧化钠反萃取。本文采用在EDTA存在下,以铍盐作载体的氨分离法富集分离锡,在3M盐酸—0.5M氯化铵底液中以方波极谱法测定,可用于碳钢、低合金钢和基准纯铁中0.00023～0.0455%锡的分析,其相对标准偏差<5%。
A small amount of tin partially dissolved in the iron carbide, that is, to change the elongation strength and hardness of steel, the processing performance is very harmful. Trace tin usually oxidized hematoxylin, catechin violet and other spectrophotometric determination of the former interference factors, harsh conditions, difficult to get accurate results; the latter need toluene extraction, sodium hydroxide back-extraction. In this paper, in the presence of EDTA, beryllium salt as a carrier for the separation of ammonia enrichment separation tin, 3M hydrochloric acid - 0.5M ammonium chloride bottom liquid by square wave polarography, can be used for carbon steel, low alloy steel and Analysis of 0.00023-0.0455% tin in standard pure iron showed a relative standard deviation of <5%.