Analytical Sciences

Abstract − Analytical Sciences, 22(1), 123 (2006).

Interferences Removal for Cadmium Determination in Samples with Complex Matrices by Hydride Generation Coupled with Non-dispersive Atomic Fluorescence Spectrometry
Zhongxi LI and Liping ZHOU
Northwest Geological Research Institute, No. 25, Xiying Road, 710054 Xi'an, China
An intermittent on-line concentration and separation system coupled with HG-AFS was developed to eliminate serious interferences from Cu2+, Pb2+ and Zn2+ on the determination of cadmium. In the present method, the interferences from common coexisting ions, such as Cu2+, Pb2+, Zn2+, Fe3+ and Ni2+, were greatly reduced. Under the optimized conditions, a detection limit of 3 pg ml-1 (3 σ, n = 11) and a precision of 1.9% RSD for 1 ng ml-1 of Cd were obtained. The method was successfully applied to the determination of cadmium in a series of Chinese Geological Reference Materials (SRMs) and GBW01621 ferronickel alloy using simple aqueous standard calibration technique. The results obtained were in good agreement with the certified values.