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Using Strontium As A Matrix Modifier For Tin Determination In Environmental Water Samples By Graphite Furnace Atomic Absorption Spectrometry

Liang Shu-xuan, Sun Han-wen, Kang Wei-jun, Ha Jing

The effectiveness of strontium nitrate as a modifier for the determination of tin in a variety of water samples by ETAAS was evaluated. The modifier allows the quantitative stabilization of Sn in water samples up to 1300 °C during the pyrolysis step. The modifier significantly enhances the sensitivity of Sn determination. The observed detection limit is 4.31μg/L with a sample volume of 20μL. The characteristic mass of the proposed method is 16.8pg. The tolerable amounts of various interferents, such as chloride, sulfate and carbonate, are high enough for the determination of tin in a variety of waters in the presence of the modifier. The recoveries of spiked tin in tap water, extract solution from unplasticized polyvinyl chloride pipes, spiked water and contaminated water from a ditch were 96.4 – 102.0%. Calibration curves were parallel when using standard additions and standard curve.