Abstract： High copper content in alloys determined by bis-cyclohexanone oxalydihydrazone spectrophotometric method rapidly was studied in this paper and the optimum chromogenic conditions were discussed. Copper and BCO form a blue complex in ammonia-ammonium chloride buffer solution at pH 8.5-10.0. The maximum absorption wavelength was 600 nm. The concentration of BCO was 0.1 g/L. The coloration temperature was 20 ℃. The coloration time was 10 min. The dosage of ammonium citrate was 1 mL. Beer’s law was obeyed in the range of 0.4-4.0 μg/mL for copper. And the apparent molar absorptivity (ε) was 1.6×104 L·mol-1·cm-1. This method was applied to determine high content copper in high temperature alloy and copper alloy CRMs. Its relative error was smaller than 1% and the RSD was less than 6.5%.
安身景, 刘 虹, 刘小东, 欧文永. 双环己酮草酰二腙光度法测定合金中高含量铜[J]. 冶金分析, 2013, 33(1): 50-53.
AN Shen-jing, LIU Hong, LIU Xiao-dong, OU Wen-yong. Determination of high content copper in alloys by bis-cyclohexanone oxalydihydrazone spectrophotometric method. , 2013, 33(1): 50-53.
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