Determination of Trace Antimony in Water Samples by Aqueous Two-Phase Extraction-Continuous Light Source Graphite Furnace Atomic Absorption Spectrometry
A method for the determination of trace antimony in water samples by aqueous two-liquid extraction-continuous light source graphite furnace atomic absorption spectrometry with ammonium pyrrolidine dithiocarbamate(APDC)as chelating agent,acetonitrile as extraction agent and sodium chloride as inorganic salt was proposed.The optimized aqueous two-phase extraction conditions of Sb3+ were as follows:the acidity of the chelation reaction system was pH 4,with 0.5 mL of 2 g·L-1 APDC reserve solution,1.6 mL of acetonitrile,and 1.2 g of sodium chloride,and the reaction time was 20 min.Under the experimental conditions,linear relationship between the corresponding absorbance and mass concentration of Sb3+ was found in the range of 1.00-20.00 μg·L-1,with detection limit(3s/k)of 0.048 μg·L-1.5.00,10.00 μg·L-1 Sb3+ standard solutions were determined 10 times,and RSDs of the determined values were 4.6%and 3.3%,respectively.Test for recovery was made by standard addition method on actual samples,giving results in the range of 95.8%-102%.This method was applied to the determination of trace antimony in tap water,river water and lake water,and some trace antimony was found in these environmental samples.
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