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锡、铅、锑基合金中测定常量铜,多采用化学法分离,络合滴定法,光度法测定。在氨水-氯化铵介质中极谱法测矿冶中微量铜是较成熟的方法,如用于这些合金中则遇到锡,铅,锑等的干扰。为此我们利用柠檬酸钠络合锡使无波峰产生;锑,镉波峰位于铜波更负的电位,影响不大,而大量的铅可在溶样后成硫酸铅析出,从而消除这些干扰。如是,实验并提出了在0.1M柠檬酸钠-2.6M氨水-0.62MNH_4Cl-0.19MNa_2SO_3底液中直接测定该合金中1～8%铜量。峰电位为-0.53伏。方法简单,准确度,精密度良好。实验部分一仪器与试剂成都7P-1A型示波极谱仪,三电极系统。
Tin, lead, antimony-based alloys in the determination of constant copper, and more use of chemical separation, complexometric titration, photometric determination. Determination of trace copper in mining and metallurgy by polarography in ammonia-ammonium chloride media is a more mature method, such as the interference of tin, lead and antimony in these alloys. For this reason, we use sodium citrate complex tin to generate no peaks; antimony and cadmium peaks in the copper wave more negative potential, little effect, but a large number of lead in the sample after the dissolution of lead sulfate, thus eliminating these interferences. If so, it is experimentally proposed that 1 to 8% of the copper in the alloy should be directly measured in 0.1 M sodium citrate-2.6 M ammonia-0.6 M NH 4 Cl-0.19 M Na 2 SO 3. The peak potential is -0.53 volts. The method is simple, accurate and precise. Experimental part of an instrument and reagent Chengdu 7P-1A-type oscilloscope polarography, three-electrode system.