Determination of trace elements in tungsten products by inductively coupled plasma atomic emission spectrometry

After the sample was dissolved with nitric acid and hydrofluoric acid in sealed plastic bottle at ambient temperature and pressure,the spectral interference of trace elements in samples,including V,Ti,Mo,Fe,Sb,Pb,As,Co,Mg,Ca,Mn,Al,Sn,Na,K,Ni,Cr,Cd,Si,Cu,Co,P and Bi,and the recoveries of elements after matrix separation by tungstic acid precipitation method was investigated.Consequently,a method for determination of trace elements in tungsten products was established by inductively coupled plasma atomic emission spectrometry(ICP-AES).For V and Ti,since there was no matrix interference and the recoveries was a little low after matrix separation by tungstic acid precipitation method,they were determined by adding matrix in the calibration curve.The low limits of determination for V and Ti were 5.2and 1.3μg/g.For other elements,including Sb,Pb,As,Co,Mg,Ca,Mn,Al,Sn,Na,K,Ni,Cr,Cd,Si,Cu,Co,P and Bi,since there were serious interference from tungsten matrix,and the recoveries were over 90.0% after matrix separation by tungstic acid precipitation method,they were determined after matrix separation by tungstic acid precipitation method.The low limits of determination for them were between 0.10and 6.7μg/g.For Fe,Mo and P,there were no good solution because of serious interference from tungsten matrix,low recoveries after matrix separation by tungstic acid precipitation method.This method provides a feasible way for determination of trace elements in tungsten products.