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过去,我们在测定铜合金中的铁时,是使用电解法或其他方法分离铜后,再用硫氰酸盐进行比色,此法分析过程冗长,色泽不稳定,尤其对于锡青铜试样,须先将偏锡酸沉淀用过氯酸及溴氢酸冒烟除锡,然后将溶液合并分离铜后再用比色法测定铁,步骤更为烦复。磺基水杨酸与三价铁在pH1.8—2.5时可形成稳定的褐红色Fe(SaL)~+络合物。此时铜、铬、锌、铅等元素均无干扰。锡虽有干扰但可用乳酸隐蔽,故以磺基水杨酸法测定铜合金或锌合
In the past, when we measured the iron in a copper alloy, the copper was separated by electrolysis or other methods and then thiocyanate for colorimetric analysis. This method was tedious and unstable in color, especially for tin bronze samples, Pretreatment of stannous acid with perchloric acid and hydrobromic acid must first be performed in addition to tin, and then the solution is combined to separate the copper and then the colorimetric determination of iron is more troublesome. Sulfosalicylic acid and ferric iron can form stable maroon Fe (SaL) ~ + complex at pH1.8-2.5. At this time, copper, chromium, zinc, lead and other elements have no interference. Although tin can interfere with lactic acid hidden, so sulfosalicylic acid method to determine the copper alloy or zinc alloy