浊点萃取-GFAAS测定不锈钢制品中食品模拟物中六价铬  

Determination of Cr( Ⅵ) in food analog of stainless steel products by cloud point extraction-GFAAS

作　　者：张丽丽[1] 霍杰标 叶蔚云[1] 王梅[1] 钟沛沛 

机构地区：[1]广东药学院公共卫生学院广东省分子流行病学重点实验室,广东广州510310

出　　处：《中国卫生检验杂志》2015年第1期24-26,共3页Chinese Journal of Health Laboratory Technology

基　　金：广东省大学生创新实验项目(1057313026);广东省高等学校教学质量与教学改革工程建设项目(粤教高函[2012]204号;粤财教[2011]473号);广东省高等教育教学成果奖培育项目资助

摘　　要：目的探讨浊点萃取-GFAAS方法测定不锈钢制品中食品模拟物中六价铬。方法采用非离子表面活性剂浊点萃取富集石墨炉原子吸收法测定。结果优化条件为:p H=4,DDTC浓度为2.0 g/L,Triton X-114浓度为1.0‰,平衡温度为60℃,平衡时间为20 min。Cr(Ⅵ)在0 ng^25 ng线性关系良好,相关系数为0.9993,方法的检出限为0.0571 ng/ml,RSD(n=6)为0.31%~7.61%,回收率为93.3%~107.0%。结论该方法检出限低,准确简便,重现性好,适宜于不锈钢制品食品模拟物中六价铬的测定。Objective To study the determination of Cr（ Ⅵ） in food analog of stainless steel products by cloud point extraction- the graphite furnace atomic absorption spectrometry（ GFAAS）. Methods The analytes were concentrated by cloud point extraction and determined by GFAAS. Results In the best conditions： the concentration of p H was 4,DDTC and Triton X- 114 were respectively 2. 0 g / L,1. 0‰,balance temperature and time were respectively 60 ℃ and 20 min,a good linear relationship was observed in the range of 0 ng ～ 25 ng,r = 0. 9993,and the detection limit of the method was 0. 0571 ng / ml. RSD（ n = 6）was 0. 31% ～ 7. 61%,and the recovery was in the range of 93. 3% ～ 107. 0%. Conclusion The methods was accurate,simple,and convenient,and the determination was low,which was suitable for the determination of Cr（ Ⅵ） in food analog of stainless steel products.

关 键 词：浊点萃取 石墨炉原子吸收光谱法 Cr(Ⅵ) 不锈钢制品 

分 类 号：O657.31[理学—分析化学]