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镉的催化示波极谱测定国内外已有很多报道。通常铝及铝合金中镉的测定用乙醇-二安替比林甲烷氯方萃取-镉试剂光度法,但用BPHA(N-苯甲酰-N-苯基羟胺即钽试剂)。作为络合剂极谱测定铝合金中微量镉的报道尚少见。本文在0.08M KCl-0.008%BPHA-0.004%乙二胺体系下,加入5%抗坏血酸以消除铁的干扰,应用于铝合金中微量镉的测定,得到良好结果。一仪器与试剂 JP-1A型示波极谱仪三电极体系 (滴汞电极,饱和甘汞电极,铂电极) PHS-2型酸度计镉标准溶液:准确称取氧化镉0.05712g,用2ml硝酸(1+1)溶解后,移入1000ml量瓶中,以水稀释至刻度,此溶液中镉的浓度为100μg·ml~(-1),使用
The catalytic oscillopolarographic determination of cadmium has been reported at home and abroad. The determination of cadmium in aluminum and aluminum alloys is usually carried out using the ethanol-diantipyryl methane chloride extraction-cadmium reagent photometry, but with BPHA (N-benzoyl-N-phenylhydroxylamine ie tantalum reagent). As a complexed polarographic determination of trace amounts of cadmium in aluminum alloy is still rare. In this paper, 0.08M KCl-0.008% BPHA-0.004% ethylenediamine system, adding 5% ascorbic acid to eliminate the interference of iron, used in the determination of trace amounts of cadmium in aluminum alloys, with good results. An instrument and reagent JP-1A oscillopolarography three-electrode system (drop mercury electrode, saturated calomel electrode, platinum electrode) PHS-2-type acidimeter standard solution of cadmium: Accurately weighed cadmium oxide 0.05712g, with 2ml of nitric acid (1 + 1) dissolved, transferred to a 1000ml volumetric flask, diluted with water to the mark, the concentration of cadmium in the solution was 100μg · ml -1, the use of