Abstract This article introduces the determination of iron, zinc and lead in copper powder by atomic absorption flame method. The method is simple, rapid, accurate and highly sensitive. The content of impurities in copper powder is 1.513 mg / kg and the content of zinc is 0.251 mg / kg. The lead content is 0.568 mg / kg, and the linear coefficient is good, which is suitable for the application in the majority of factories, mines and research institutes.
Keywords copper powder; iron; zinc; lead; atomic absorption spectrometry
With the continuous development of China's economy, the demand for raw materials and testing requirements are also increasing. Among them, copper powder is an important metal raw material. According to the different content of pure copper in copper powder, it is divided into products of different specifications. Therefore, the inspection of the content of impurities and other heavy metals in copper powder is an important part of product quality control, which has increasingly attracted people's attention.
Common methods for detecting impurity metals in copper powder include nitric acid leaching method, mixed acid leaching method, high temperature ashing method, etc. Among them, high-temperature ashing requires a high-temperature ashing furnace. When there is a lack of high-temperature heating equipment, the nitric acid leaching method is usually used.
Because the copper powder contains impurities zinc, iron and lead, it can be accurately analyzed by the air-acetylene flame method, and the analysis results are very consistent with the results of ICP-MS. Because the sensitivity of ICP-MS is usually lower than that of atomic absorption, the results of atomic absorption analysis at 10-6 ~ 10-9g / mL are more accurate than those of ICP-MS.
In this paper, mixed acid leaching samples and air-acetylene flame atomic absorption spectrometry were used to determine the content of iron, zinc and lead in copper powder.
1 Experiment
1.1 Instruments and experimental conditions Atomic absorption spectrophotometer: model AA2610
Table 1 Flame Atomic Absorption Spectrometry Determination of Element Instrument Parameters Iron Zinc Lead Wavelength / nm 248.3 213.9 283.3
Lamp current / mA 2.5 2.5 2.5
Slit / nm 0.2 0.2 0.4
C2H2 / L / min 1.5 1 1.5
Air / L / min 6
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