Abstract
The effective preconcentration of submicrogram amounts of nickel from water is described. Nickel is extracted into xylene as a dithiocarbamate complex and subsequently back-extracted into 100 μl of nitric acid for graphite furnace atomic absorption spectrometry. Conditions for quantitative extraction and back-extraction are described. Data on interferences, precision and detection limits are presented. Sub-μg 1 −1 levels of nickel in water could be determined with concentration factors of 500–1000 by the proposed method. The concentrations of nickel in rain water and surface snow were found to be 0.39 and 0.19 μg 1 −1, respectively. The limit of determination can be lowered by using concentration factors larger than 10 4, nickel determination at ng 1 −1 levels being feasible.
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