The determination method for analyzing trace copper in vanadium alloy by flame atomic absorption spectrometry was investigated in the paper. The sample digestion method, digestion acidity, determination conditions, matrix interferences, method precision, recovery of standard addition were investigated in detail. The method precision in RSD% was 8.6%, and the average recoveries of standard addition were from 93.9% to 95.6%. The experimental results indicated that the proposed method for determination of trace copper in vanadium alloy was simple, fast, accurate, and easy to operate, which was suitable for quality control of vanadium alloy.
According to JJF 1059.1-2012 of Evaluation and Expression of Uncertainty, the uncertainty of determination zinc in cast aluminum alloys ingots samples by photoelectric direct reading spectrometry was evaluated. The uncertainty sources were analyzed and the relevant mathematical models were established. The influential factors of precision were dissected. Each of the standard uncertainty, the combined standard uncertainty, the expanded uncertainty and the confidence interval were anatomized.
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