Abstract：It is difficult to decompose the cobalt-chromium-tungsten alloy in acid solution under normal temperature and pressure. The microwave digestion was used to increase the temperature and pressure for sample dissolution. The sample was fully digested in the medium of hydrochloric acid, nitric acid and hydrofluoric acid. After dissolution and dilution, tartaric acid solution was added. A method for the determination of tungsten in cobalt-chromium-tungsten alloy powder by inductively coupled plasma atomic emission spectrometry (ICP-AES) in the medium of dilute hydrochloric acid was established using W 207.912 nm as the analytical line. The experimental results showed that the coexisting elements almost had no influence on the determination results. Under the selected operating conditions, the linear correlation coefficient of calibration curve was 0.999 9.Limit of detection of tungsten was 0.002 3% (mass fraction). The proposed method was applied for the determination of tungsten in cobalt-chromium-tungsten alloy powder, and the relative standard deviation (RSD, n=11) of determination results was less than 3%. The spiked recoveries were between 97.4% and 102.3%.
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