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建立了分散液液微萃取-石墨炉原子吸收光谱法测定食用植物油样品中砷含量的分析方法。优化影响萃取和富集效率的因素,取得的最佳实验条件为:萃取剂HNO3为6.3 mol/L、分散剂曲拉通-X114为10%(V:V)、萃取振荡时间为15 min、水浴温度为40℃。方法检出限为8.49μg/kg。微萃取技术与国家标准方法中样品前处理方法相比对,微萃取方法的萃取效率达87.06%~95.07%,线性相关系数为0.9969。
A method for the determination of arsenic in edible vegetable oil samples by dispersive liquid-liquid microextraction and graphite furnace atomic absorption spectrometry was established. The optimal conditions for the extraction and enrichment efficiency were as follows: the extraction agent HNO3 was 6.3 mol / L, the dispersant Triton-X114 was 10% (V: V), the extraction oscillation time was 15 min, The temperature of the water bath is 40 ° C. The detection limit was 8.49 μg / kg. Compared with the sample pretreatment method in the national standard method, the extraction efficiency of microextraction method is 87.06% -95.07%, and the linear correlation coefficient is 0.9969.