期刊
SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY
卷 55, 期 7, 页码 1109-1116出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0584-8547(00)00195-6
关键词
flow injection; solid phase extraction; Pb; soil; flame atomic absorption spectrometry
类别
A flow-injection, solid-phase extraction, preconcentration method was developed for the determination of lead in soil and water samples by flame atomic absorption spectrometry. Lead, in the form of the diethyldithiocarbamate complex, was retained on a miniature column of Chromosorb 102 from buffered sample solutions. Several parameters governing the efficiency and throughput of the method were evaluated including pH, eluent composition, volume and flow rate. The complex retained from pH 9.0 (ammonium acetate) solutions was eluted with 176 mu l of ethanol, at 4.2 ml min(-1) into the nebulizer-burner system of the spectrometer. The detection limit was 2 mu g 1(-1) for preconcentration at 2.2 ml min(-1) for 120 s. The relative standard deviation (R.S.D) was less than 4% for concentrations down to 400 mu g 1(-1) The procedure was validated by the analysis of NIST standard reference material 2711 (Montana Soil) which contains lead at a concentration of 1162 mu g g(-1). Recoveries of spike additions (100-400 mu g 1(-1)) to artificial sea water and tap water were quantitative. (C) 2000 Elsevier Science B.V. All rights reserved.
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