Determination of trace elements in high-purity nickel by inductively coupled plasma mass spectrometry with microwave digestion

A method for simultaneous direct determination of thirteen trace elements in high-purity nickel including Si,P,Fe,Cu,Zn,As,Cd,Sn,Sb,Pb,Al,Mn,Mg by inductively coupled plasma mass spectrometry(ICP-MS) with microwave digestion has been established.The conditions of microwave digestion,the matrix effect and spectral interferences were investigated,and the operating parameters of the ICP ionization source,mass spectrometry and microwave digestion were optimized.It was found that the matrix effect could be eliminated by matching matrix or selecting Sc,Rh as internal standard element and the spectral interference could be calibrated by selecting different isotope or correction equation of interference elements.The detection limits range of the method is from 0.01 to 0.05 μg/L for thirteen trace elements.The precision and recovery tests were made and the results obtained were as follows: the recoveries in the range 92.0%-112.0% and RSD 8.5 %.The determination results of actual samples are consistent with those obtained by other methods.