云南滇东地区8个州市鱼类中砷的形态测定分析

Speciation analysis of arsenic in fishes from 8 cities in Diandong area of Yunnan province

目的分析测定云南滇东8个州市鱼类中砷的形态以及含量。方法鱼类样品经石墨湿法消解,采用电感耦合等离子体质谱法测定总砷含量;相同的样品经1%硝酸热提取无机砷,采用液相色谱-原子荧光光谱法测定各形态砷含量。结果总砷及无机砷在一定浓度范围内分别有良好的线性关系,相关系数均大于0.999,总砷的加标回收率为93.57%~95.0%,其他形态砷的加标回收率为89.03%~92.04%,测定总砷的质控样均在参考值范围内。132件样品中总砷含量为0-2.31 m g/kg;无机砷中三价砷的含量为0~0.279mg/kg,其中昆明、红河及玉溪的样品有部分超标,超标率分别的为26.09%、22.22%、11.11%。结论有131件鱼样品检出总砷和无机砷,无机砷含量大部分达到国家标准要求,只有少部分超出标准限值。应加强对水产品中砷的监测,以确保鱼类食品的安全。

Objective To analyze and determine the form and content of arsenic in fish in 8 cities in diandong area ofYunnan province. Methods Fish samples were digested by graphite wet method, and total arsenic was determined byinductively coupled plasma mass spectrometry. The same sample was extracted with inorganic arsenic by 1% nitric acid, andthe arsenic content of each form was determined by liquid chromatography-atomic fluorescence spectrometry. Results Totalarsenic and inorganic arsenic all had a good linear relationship in a certain concentration range, and the correlationcoefficients were greater than 0.999. The recoveries of total arsenic were 93.57%-95.0%, and the recoveries of other forms ofarsenic were 89.03%~92.04%. The quality control samples for determination of total arsenic were within the referencerange. The total arsenic content in 132 samples were 0-2.31 mg/kg. The content of trivalent arsenic in inorganic arsenicwere 0-0.279 mg/kg, among which some samples from Kunming, Honghe and Yuxi exceeded the standard, with theexceeding rates of 26.09%, 22.22% and 11.11%, respectively. Conclusion Total arsenic and inorganic arsenic were detectedin 131 fish samples, and most of the inorganic arsenic content met the national standard requirements, and only a small partexceeded the standard limit. Monitoring of arsenic in aquatic products should be strengthened to ensure the safety of fish food.