Determination of Ga, Ge, Se, Cd, In, Te, La and Tl in Nickel Concentrates by ICP-MS Combined with Microwave Digestion

The sample was digested by microwave with the mixed solution of HNO₃、HCl、HF and H₂O₂ (3+1+1+1), then HNO₃ (1+1) solution was added to dissolve the salt and the solution was diluted for ICP-MS analysis with ¹⁰³Rh and ²³²Th as internal standard. The calibration equation was used to eliminate mass spectral interference. The linearity range of Se and the other 7 elements were 0.500-500.0, 0.050-100.0 μg·L^-1, respectively. The detection limits (3s) of 8 elements were in the range of 0.01-0.8 mg·kg^-1. Recovery rates obtained by standard addition method were in the range of 90.9%-113%, and RSDs (n=4) were in the range of 0.90%-7.7%. The proposed method was applied to the determination of Cd in nickel concentrate standard substances, giving results in agreement with the certified values.