Determination of total tin in seafood from coast of Guangdong province by GFAAS

Objective To establish a method for detection of total tin inseafood by GFAAS.Methods The seafood samples were collected from 17 sea areas and some seafood markets in Guangdong province.The samples were digested by HNO3 in high-pressure closed-vessel,then the solution was analyzed by GFAAS with PdCl2-NH4H2PO3 as matrix modifier.Results The ashy temperature and sensitivity could be well increased by PdCl2-NH4H2PO3 as matrix modifier.The calibration curve showed good linearity in the range of 0-40μg/L with a correlation coefficient of 0.998.The detection limit was 8.5 ng/g wetweight and the recoveries were between 95.2%-107.6%.The precision ranged from 3.9%to 7.1%.The content of total tin ranged from 27.4 to 687.3ng/g wetweight for 58 samples tested.The average concentration was 135.1ng/g wetweight and the content of total tin in different seafood showed significant difference.Conclusion The method is good in sensitivity,precision and accuracy.The results indicate that the seafood was possibly polluted by tin compound in different levels around the coast of Guangdong province.