Abstract：The neodymium-iron-boron magnetic alloy has been widely used in goods for everyday consumption. With the increasing requirements of goods for everyday consumption in environmental quality, the determination of lead content in neodymium-iron-boron magnetic alloy was attracting attention. The sample was dissolved with aqua regia. The calibration curve was established by iron matrix matching method, and the background was deducted by deuterium lamp. Thus, a determination of lead content in neodymium-iron-boron magnetic alloy by air-acetylene flame atomic absorption spectrometry was realized at spectral line of Pb 283.3nm. The effect of main matrix elements including neodymium, iron and boron in sample on determination of lead was systemically investigated. The results showed that the influence of boron and neodymium could be ignored. However, the interference of iron could not be neglected. According to the structural formula (Nd2Fe14B) of main hard magnetic phase in neodymium-iron-boron magnetic alloy, the mass fraction of iron was approximately 71%. It could be calculated that the mass concentration of iron in sample solution was about 2840mg/L after the sample was digested and diluted to constant volume according to the experimental method. The experiments indicated that the absorbance of lead were stable when the mass concentration of iron was in range of 1600-3600mg/L, while, they were much higher than that of matrix blank. Therefore, the matrix interference was finally eliminated by matching 2800mg/L of iron. Under the selected experimental conditions, the linear range of method was 0.10-5.00mg/L, the correlation coefficient was 0.999, and the detection limit was 0.02mg/L. The content of lead in three neodymium-iron-boron magnetic alloy actual samples was determined according to the experimental method. The relative standard deviation (RSD, n=6) was less than 6%, and the recoveries were between 93% and 103%. According to the limit requirement of lead in goods for everyday consumption, the simulated sample of neodymium-iron-boron magnetic alloy with lead content of 1000mg/kg was prepared and determined by the proposed method. The results were basically consistent with the theoretical values.
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