Direct determination of cadmium at parts-per-billion level in waters by derivative atomic absorption spectrometry using atom trapping technique

H Sun; L Yang; D Zhang; J Sun

doi:10.1016/s0039-9140(96)02157-1

Direct determination of cadmium at parts-per-billion level in waters by derivative atomic absorption spectrometry using atom trapping technique

Talanta. 1997 Nov;44(11):1979-86. doi: 10.1016/s0039-9140(96)02157-1.

Authors

H Sun¹, L Yang, D Zhang, J Sun

Affiliation

¹ Department of Chemistry, Hebei University, Baoding, 071002, People's Republic of China.

PMID: 18966943
DOI: 10.1016/s0039-9140(96)02157-1

Abstract

A method has been described for the direct determinations of trace cadmium using derivative atom trapping flame atomic absorption spectrometry with an improved water-cooled stainless steel trapping equipment. The characteristic concentration (gave a derivative absorbance of 0.0044) and detection limit (3sigma) of cadmium were 0.028 and 0.02 ng ml(-1) when collecting for a 1 min, respectively, which were 992 and 145-fold better than those of the conventional flame atomic absorption spectrometry. The detection limit and sensitivity of the proposed method for a 2 min collection time were 1 and 2 orders of magnitude higher than those of conventional flame atomic absorption spectrometry. The present method was applied to the determinations of cadmium in water samples with a recovery range of 91 approximately 111% and a relative standard deviation of 4.7 approximately 5.6%.