Abstract：The sample was treated with aqua regia by microwave digestion. The stepwise temperature rising method was adopted: (1) the temperature was increased to 120 ℃ in 5 min, and kept for 6 min; (2) the temperature was increased to 180 ℃ in 5 min, and kept for 6 min. Si 251.612 nm, Mn 293.930 nm, P 213.618 nm, Cr 206.149 nm, Cu 324.754 nm, Co 238.892 nm and Ni 221.647 nm were selected as analytical lines. The proper background deduction position was set. The influence of matrix effect was eliminated by preparing calibration curves using matrix matching method. The content of silicon, manganese, phosphorus, chromium, copper, cobalt and nickel was simultaneously determined by inductively coupled plasma atomic emission spectrometry (ICP-AES). The determination method of silicon, manganese, phosphorus, chromium, copper, cobalt and nickel in nickel-iron alloy was established. The linear correlation coefficients of calibration curves of testing elements were all higher than 0.999 5. The detection limits of elements in nickel-iron alloy were between 0.000 9% and 0.003% (mass fraction). The proposed method was applied to the determination of silicon, manganese, phosphorus, chromium, copper, cobalt and nickel in nickel-iron alloy standard sample JSS 760-3, and the found results were consistent with certified values. The relative standard deviations (RSD, n=10) were between 0.36% and 5.2%.
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