Discussion on the results stability for determination of copper, zinc and manganese in copper-zinc brazing filler metal by spark discharge atomic emission spectrometry
LIU Man-yu, CHEN Bo, WANG Qing-jiang, CHEN Peng LI Dan-hui, HAO Zeng-long
Harbin Well Welding Co., Ltd., Harbin 150028, China
Abstract：The chemical composition of copper, zinc and manganese in copper-zinc brazing filler metal was usually determined by chemical wet method. But the analytical periods were relatively long, which could not meet the requirements of analysis efficiency in modern production enterprises. The influence factors on determination stability of copper, zinc and manganese in copper-zinc brazing filler metal by spark discharge atomic emission spectrometry were investigated, including the preparation of samples, the setting of argon output pressure and various excitation parameters. The following conditions were selected by experiments: the nickel-based block sample was prepared for analysis by tabletting method; the alcohol wet milling was selected for the sample surface treatment; the output pressure of argon was adjusted at 3.0MPa; for light source analysis parameters, the flush time was 4s, the pre-combustion time was 25s and the integral time was 5s. Under the optimized experimental conditions, the copper-zinc brazing filler metal with thickness of 1.5mm was used for precision test. The relative standard deviation (RSD, n=10) of determination results was 0.14%, 0.15% and 0.98% for copper, zinc and manganese, respectively. The found results were consistent with the reference values provided by other laboratories
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LIU Man-yu, CHEN Bo, WANG Qing-jiang, CHEN Peng LI Dan-hui, HAO Zeng-long. Discussion on the results stability for determination of copper, zinc and manganese in copper-zinc brazing filler metal by spark discharge atomic emission spectrometry. , 2019, 39(6): 42-48.
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