广东海域海产品中总锡石墨炉原子吸收法测定
Determination of total tin in seafood from coast of Guangdong province by GFAAS
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摘要: 目的 建立海产品中总锡的石墨炉原子吸收测定法,并对广东省沿海海域海产品中总锡含量进行测定。方法 有代表性采集广东沿海海域17个海区及部分市售海产品,样品经硝酸高压消解,采用氯化钯+磷酸二氢铵为混合基体改进剂,石墨炉原子吸收光谱法测定海产品中总锡。结果 氯化钯+磷酸二氢铵混合基体改进剂能有效提高锡测定的灰化温度和灵敏度,方法线性范围为0～40μg/L,线性相关系数为0.998,检出限为8.5ng/g(以湿重计),精密度为3.9%～7.1%,回收率为95.2%～107.6%。在58个海产品中,以湿重计算的总锡含量为27.4～687.3ng/g,平均含量为135.1ng/g,不同品种海产品中总锡含量差异有统计学意义(P<0.01)。结论 该方法灵敏、准确、可靠,测定结果提示广东沿海海域海产品可能受到不同程度锡类化合物污染。Abstract: 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.
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