论文部分内容阅读
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 investigate the determination of hexavalent chromium in food simulants in stainless steel by Cloud Point Extraction-GFAAS. Methods Non - ionic surfactant cloud point extraction enrichment by graphite furnace atomic absorption spectrometry. Results The optimized conditions were as follows: p H = 4, DDTC concentration 2.0 g / L, Triton X-114 1.0 ‰, equilibrium temperature 60 ℃ and equilibrium time 20 min. The linearity of Cr (Ⅵ) was in the range of 0 ng ~ 25 ng with a correlation coefficient of 0.9993. The detection limit of the method was 0.0571 ng / ml, RSD (n = 6) was 0.31% ~ 7.61% and the recovery was 93.3% ~ 107.0 %. Conclusion The method has the advantages of low detection limit, accurate and convenient, good reproducibility and is suitable for the determination of hexavalent chromium in food simulants of stainless steel products.