原子荧光法测定食盐中的总汞及总砷
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摘要
目的采用原子荧光光度法分别测定食用盐中砷、汞的含量,了解食盐的砷、汞污染物安全现状和再污染现状。方法 2018-04/08间采集南充市每个区(县)盐样各100份,总计900份。食盐样品直接加水溶解定容,砷测定以制盐工业通用试验方法为依据,砷在硫脲预还原剂作用下还原成As~(3+)。汞测定参考GB 5009.17-2014和GB/T 5750.6-2006两个方法,汞在溴酸盐的作用下全部转为Hg~(2+)。结果砷检出限为0.003 0 mg/kg,RSD为6.71%,加标回收率在96.0%～102.8%之间。汞检出限为0.000 10 mg/kg,RSD为9.15%,加标回收率在98.8%～112.0%之间。样品测定结果砷含量均低于0.016mg/kg,汞含量均低于0.019 mg/kg,砷、汞含量均未超标。结论此方法操作简单,结果准确,非常适合食用盐中砷、汞的测定,调查得出砷、汞污染物均符合国家污染物限值要求,绿色安全。
Objective To determinate the arsenic and mercury in edible salt by using the method of atomic fluorescence spectrometry and understand the safety status and re-polluting status of arsenic and mercury pollutants in salt. Methods Salt samples were collected about 100 samples for each district(county) in Nanchong City from April to August 2018, which were 900 samples in total.The salt sample was directly added with water to dissolve the volume,arsenic determination was in accordance with the general test method of the salt industry, and arsenic was reduced to As~(3+) under the action of thiourea pre-reducing agent. Mercury, which was converted to Hg~(2+) under the action of bromine, was measured based on the GB5009.17-2014 and GB/T 5750.6-2006. Results The detection limit of arsenic was 0.003 0 mg/kg, the RSD was 6.71%, and the recovery rate ranged from 96.0% to 102.8%. The mercury detection limit was 0.000 10 mg/kg, the RSD was 9.15%, and the spiked recovery rate varied from 98.8% to 112.0%. The arsenic content of the samples was less than 0.016 mg/kg, and the mercury content was less than 0.019 mg/kg. The arsenic and mercury contents were not exceeded.Conclusion This method was simple, accurate and extremely suitable for the determination of mercury and arsenic in edible salt. The investigation finds that arsenic and mercury pollutants are in line with the national pollutant limit requirements and are green and safe.
Objective To determinate the arsenic and mercury in edible salt by using the method of atomic fluorescence spectrometry and understand the safety status and re-polluting status of arsenic and mercury pollutants in salt. Methods Salt samples were collected about 100 samples for each district(county) in Nanchong City from April to August 2018, which were 900 samples in total.The salt sample was directly added with water to dissolve the volume,arsenic determination was in accordance with the general test method of the salt industry, and arsenic was reduced to As~(3+) under the action of thiourea pre-reducing agent. Mercury, which was converted to Hg~(2+) under the action of bromine, was measured based on the GB5009.17-2014 and GB/T 5750.6-2006. Results The detection limit of arsenic was 0.003 0 mg/kg, the RSD was 6.71%, and the recovery rate ranged from 96.0% to 102.8%. The mercury detection limit was 0.000 10 mg/kg, the RSD was 9.15%, and the spiked recovery rate varied from 98.8% to 112.0%. The arsenic content of the samples was less than 0.016 mg/kg, and the mercury content was less than 0.019 mg/kg. The arsenic and mercury contents were not exceeded.Conclusion This method was simple, accurate and extremely suitable for the determination of mercury and arsenic in edible salt. The investigation finds that arsenic and mercury pollutants are in line with the national pollutant limit requirements and are green and safe.
引文
[1]GB 2762食品安全国家标准食品污染物限量[S].2017.
[2]钟超斌,潘柳青.氢化物发生-原子荧光光谱法测定食盐中砷[J].微量元素与健康研究,1996,13(4):46-47.
[3]孙鹏,于立娟,李广义,等.氢化物发生-原子荧光光谱法同时测定食盐中的砷和汞[J].中国测试,2015,41(1):46-49.
[4]马智勇.ICP-AES法测定食盐中砷含量方法的建立与优化[J].轻工标准与质量,2018(6):30-32.
[5]范化峰.氢化物发生ICP-AES法测定食盐中痕量砷[J].中国卫生检验杂志,2003,13(1):73-74.
[6]王佩琪,孙桀,刘登玲,等.双道原子荧光光谱法对食盐中汞和砷的联合测定[J].盐科学与化工,2018,47(12):33-35.
[7]GB/T 13025.13制盐工业通用试验方法砷的测定[S].2012.
[8]GB 5009.17食品安全国家标准食品中总汞及有机汞的测定[S].2014.
[9]GB/T 5750.6生活饮用水标准检验方法金属指标[S].2006.
[10]王欢,郑鑫.国内食品分析中氢化物发生-原子荧光分析法的应用探讨[J].当代化工研究,2018,2:81-82.
[11]施宏景.用原子荧光光谱法测定食盐中汞含量[J].安徽预防医学杂志,2017,13(1):36-37.
[12]赖正青.初探原子荧光法测定食盐中汞空白影响因素及对策[J].中国井矿盐,2017,48(4):39-40.
[2]钟超斌,潘柳青.氢化物发生-原子荧光光谱法测定食盐中砷[J].微量元素与健康研究,1996,13(4):46-47.
[3]孙鹏,于立娟,李广义,等.氢化物发生-原子荧光光谱法同时测定食盐中的砷和汞[J].中国测试,2015,41(1):46-49.
[4]马智勇.ICP-AES法测定食盐中砷含量方法的建立与优化[J].轻工标准与质量,2018(6):30-32.
[5]范化峰.氢化物发生ICP-AES法测定食盐中痕量砷[J].中国卫生检验杂志,2003,13(1):73-74.
[6]王佩琪,孙桀,刘登玲,等.双道原子荧光光谱法对食盐中汞和砷的联合测定[J].盐科学与化工,2018,47(12):33-35.
[7]GB/T 13025.13制盐工业通用试验方法砷的测定[S].2012.
[8]GB 5009.17食品安全国家标准食品中总汞及有机汞的测定[S].2014.
[9]GB/T 5750.6生活饮用水标准检验方法金属指标[S].2006.
[10]王欢,郑鑫.国内食品分析中氢化物发生-原子荧光分析法的应用探讨[J].当代化工研究,2018,2:81-82.
[11]施宏景.用原子荧光光谱法测定食盐中汞含量[J].安徽预防医学杂志,2017,13(1):36-37.
[12]赖正青.初探原子荧光法测定食盐中汞空白影响因素及对策[J].中国井矿盐,2017,48(4):39-40.