石墨炉原子吸收法测定海洋生物中总砷

目的建立海洋生物中总砷的石墨炉原子吸收方法,测定广东沿海海洋生物中总砷含量。方法海洋生物样品经硝酸高压消解后,采用氯化钯+硝酸镍为基体改进剂,用石墨炉原子吸收法测定总砷含量。结果方法线性范围为0～40μg/L,线性相关系数为0.997,检出限为0.030mg/kg,精密度为3.7%～5.1%,国家标准参考物质的分析结果在证书值范围内。在所检的99个海洋生物中,以湿重计算的总砷含量为0.09～12.58mg/kg,平均含量为1.85mg/kg。结论该法能有效消除基体干扰,并具有良好的精密度和准确度,测量结果显示广东沿海海洋生物受到不同程度的砷污染。

Total arsenic in marine organisms determined by graphite furnace atomic absorption spectrometry

Objective To establish the method of total arsenic in marine organisms determined by graphite furnace atomic absorption spectrometry(GFAAS) in order to detect the contents of total arsenic in marine organisms around the coast of Guangdong Province. Methods The marine organisms samples were digested by HNO_3 in high-pressure closed-vessel, the contents of total arsenic were analyzed by GFAAS with PdCl_2-NiNO_3 as matrix modifier. Results The calibration curve showed good linearity in the range of 0-40μg/L with correlation coefficient of 0. 997, the detection limits were 0.030mg/ kg and the preeisions ranged from3.7 % to 5.1%, and the results of analyzing standard materials were in the certificate values. The contents of total arsenic ranged from 0.09mg/kg to 12.58mg/kg wet weight in the 99 tested samples and the average contents were 1.85mg/kg. Conclusion The interference of matrix could well be eliminated by the method which could be precise and accurate, the marine organisms around the coast of Guangdong Province were polluted by arsenic in different levels.