Interferences removal for cadmium determination in samples with complex matrices by hydride generation coupled with non-dispersive atomic fluorescence spectrometry.
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) (3sigma, 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.
Li
Zhongxi
Z
Northwest Geological Research Institute, No. 25, Xiying Road, 710054 Xi'an, China.
Zhou
Liping
L
D002104:Cadmium / Q000032:analysis*; D002138:Calibration; D003300:Copper / Q000032:analysis; D006851:Hydrochloric Acid / Q000737:chemistry; D006859:Hydrogen / Q000737:chemistry; D007501:Iron / Q000032:analysis; D007854:Lead / Q000032:analysis; D019216:Metals, Heavy / Q000032:analysis*; D009532:Nickel / Q000032:analysis; D012680:Sensitivity and Specificity; D013054:Spectrophotometry, Atomic / Q000295:instrumentation* / Q000379:methods*; D013997:Time Factors; D015032:Zinc / Q000032:analysis
D019216:Metals, Heavy; D002104:Cadmium; D007854:Lead; D003300:Copper; D009532:Nickel; D006859:Hydrogen; D007501:Iron; D015032:Zinc; D006851:Hydrochloric Acid