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純錫中含铁0.002—0.04％,含銅0.002—0.1％。銅的存在干扰铁的比色,一般情况下均須預先分离。按法应用硫代硫酸鈉在盐酸(1∶4)溶液中分离銅,在氨性溶液中,磺基水杨酸比色測定铁。实际經驗証明,按此法分离微量銅是十分不完全的。云錫公司中心試驗所曾以飽和硫化氢水分离銅,初步获得滿意結果,但仍未能有效地縮短时間。根据
Pure tin in iron 0.002-0.04%, 0.002-0.1% copper. The presence of copper interferes with the colorimetric properties of iron and should generally be separated beforehand. According to the law of sodium thiosulfate in hydrochloric acid (1: 4) solution of copper, ammonia solution, sulfosalicylic acid colorimetric determination of iron. Practical experience shows that, according to this method is very incomplete separation of trace copper. In the test center of Yun-Tin Company, copper was separated from saturated hydrogen sulphide by water, but satisfactory results were obtained initially, but the time was still shortened effectively. according to