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过去,直接络合测定铜合金中镍、锌都用氰化钾作隐蔽剂。我们试验成功的适合于高镍铜合金的分析方法系采用乙二胺、硫代硫酸钠、巯基乙酸代替氰化钾,除含铅锰外,可以直接测定各种牌号铜合金中的镍、锌。对于不含镍的锡青铜,我们则根据一机系统福建会议推荐的方法进行改进,找到氯离子不干扰铬酸铅沉淀的条件,改用盐酸、过氧化氧溶解试样,溶样快速,节省大量醋酸盐,可以联合测定,亦可单独测定。本方法测定铅需15分钟,联测镍
In the past, direct complexation determination of copper alloy nickel, zinc potassium cyanide used as a covert agent. We successfully test the method suitable for high-nickel copper alloy is the use of ethylenediamine, sodium thiosulfate, thioglycolic acid instead of potassium cyanide, in addition to lead-manganese, the direct determination of various grades of copper alloy nickel, zinc . For the nickel-free tin bronze, we improved the method recommended by the Fujian Conference of a Machine System to find that the chloride ion does not interfere with the precipitation of lead chromate, and use hydrochloric acid and peroxide to dissolve the sample and dissolve the sample fast and save A large number of acetate, can be jointly measured, can also be measured separately. The method of determination of lead to be 15 minutes, measuring nickel