Determination of Arsenic,Antimony,Bismuth in Ferro-Tungsten by Inductively Coupled Plasma Atomic Emission Spectrometry

The simultaneous determination of arsenic,antimony and bismuth in ferrotungsten was studied by inductively coupled plasma atomic emission spectrometry.The sample was decomposed with oxalic acid and hydrogen peroxide.In the medium of mixed acid,tungsten was converted to tungstate precipitates and thus separated from sample solution.When residual tungsten in sample solution was less than 150 μg/mL,it did not interfere in the determination.The interference of residual tungsten could be eliminated by the background correction mode and matrix matching. The proposed method has been applied to the determination of arsenic,antimony and bismuth in ferro-tungsten,with the recoveries of 95 %-105 %,and the relative standard deviation(RSD) of 0.86 %-3.6 %.



 

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