Determination of Lead,Tin and Bismuth in the Ferrotungsten by Inductively Coupled Plasma Atomic Emission Spectrometry

Determination of lead,tin and bismuth in the ferrotungsten by inductively coupled plasma atomic emission spectrometry.

A method for the determination of lead,tin and bismuth by inductively coupled plasma atomic emission spectrometry was studied.The sample was decomposed with oxalic acid and hydrogen peroxide.In the medium of ammonia at pH≥9,Pb,Sn and Bi were precipitated and separated from W in the solution.The residual tungsten in the sediment was less than 0.7% after twice precipitation with ammonia liquor.The interferences from residual tungsten could be eliminated by the background correct mode.The restraining influence from iron on the intensity of Pb,Sn could be overcome by matrix matching.The method has been applied to the determination of Pb,Sn and Bi in ferrotungsten with the recovery of 96%-102% and relative standard deviation of 1.3%-1.5%.



 

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