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铝合金中铜、锌的测定,通常需要分别处理试样。本法利用铜与硫氰酸盐生成络离子吸附在滴汞电极上,于电位-0.65伏(对SCE)处产生灵敏的络合物吸附波这一情况,在测锌后的试液中加入硫氰酸钾,组成柠檬酸钠-氯化铵-硫氰酸钾的氨性底液体系,直接测定铜。试验结果表明,硫氰酸盐的加入能使波高迅速增加,当其浓度达0.3％时波高恒定;铜量在0—0.2毫克/50毫升范围内呈线性关系;基体铝可用柠檬酸根络合掩蔽无干扰,1毫克铁(Ⅲ)、镁、锰(Ⅱ)也无
Determination of copper and zinc in aluminum alloy, usually require separate treatment of the sample. This method uses copper and thiocyanate to generate complex ions adsorbed on the droplet mercury electrode at a potential of -0.65 volts (to SCE) to produce a sensitive complex adsorptive wave. In the test solution after zinc is added Potassium thiocyanate, ammonium base composed of sodium citrate - ammonium chloride - potassium thiocyanate liquid bottom system, direct determination of copper. The results showed that the addition of thiocyanate increased the wave height rapidly, and the wave height was constant when the concentration was up to 0.3%. The copper content was linear within the range of 0-0.2 mg / 50 ml. The matrix aluminum could be masked with citrate complex No interference, 1 mg of iron (Ⅲ), magnesium, manganese (Ⅱ) nor