Determination of trace bismuth in water samples by hydride generation-atomic fluorescence spectrometry after cloud point extraction

With dithizone-nonionic surfactant(Triton X-114) as cloud point extraction system to separate and enrich bismuth,the content of bismuth in enrichment phase was determined by hydride generation atomic fluorescence spectrometry after experimental conditions such as pH of solution and cloud point extraction temperature and so on were optimized.The results showed that the extraction yeild of bismuth was 90.5 %,and the linear range was 0.025-2.0 μg/L with regression equation of If=21.51c-0.88(r=0.999 7),relative standard deviation(RSD,n=6) less than 7 % and detection limit of 0.015 μg/L.This method had been applied to the determination of bismuth in water samples with recoveries in the range of 89 %-93 %.