作者：秦樊鑫, 姜鑫, 黄先飞, 吴迪, 庞文品, 吕亚超

作者单位：贵州师范大学 贵州省山地环境重点实验室, 贵州 贵阳 550001

关键词：甲苯;石墨炉原子吸收;高盐食品;砷;基体改进剂

摘要：

建立甲苯萃取-石墨炉原子吸收测定高盐食品中砷的方法。用微波消解样品,甲苯萃取分离砷,硝酸镍作基体改进剂,钯涂层石墨炉原子吸收法测定高盐食品中微量砷。结果表明:用甲苯萃取砷提高了回收率,很好地消除基体干扰;用硝酸镍作基体改进剂,提高砷的灰化温度和灵敏度,方法的相对标准偏差1.12%(n=6);回收率达到97.5%~104.5%;检出限为0.038 mg/kg。该法灵敏、准确、可靠,可用于高盐食品中微量砷的测定。

Determination of trace arsenic in the salty food by GFAAS after toluene extraction

QIN Fanxin, JIANG Xin, HUANG Xianfei, WU Di, PANG Wenpin, LÜ Yachao

Guizhou Provincial Key Laboratory for Mountainous Environment, Guizhou Normal University, Guiyang 550001, China

Abstract: A method for determination of arsenic in salty food samples by graphite furnace atomic absorption spectrophotometry(GFAAS) after toluene extraction is established. The samples are digested with a microwave system. Arsenic is extracted and separated from these samples with toluene. The Pd-coated GFAAS determins the contents of arsenic in samples with Ni(NO3)2 as a matrix modifier. The results show that the recovery of arsenic has been improved after toluene extraction, the charring temperature enhanced, and the interference of matrix eliminated. The relative standard deviation of this method is equal or less than 1.12%(n=6). Recoveries ranging from 97.5% to 104.5% are obtained in the spiked samples. The detection limit is 0.038 mg/kg. The proposed method is sensitive, accurate and credible, which can be used to measure trace arsenic in salty food.

Keywords: toluene;GFAAS;salty food;arsenic;matrix addition

2016, 42(3): 41-44  收稿日期: 2015-07-30;收到修改稿日期: 2015-09-29

基金项目: 国家自然科学基金项目(21467005)贵州省科技厅农业攻关项目(黔科合NY字[2010]3071号)

作者简介: 秦樊鑫(1978-),男,贵州印江县人,副教授,硕士,主要从事重金属污染与检测研究。

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