空气/氩气双通气-原子吸收石墨炉法测定食用油中的二甲基硅氧烷

Determination of the content of polydimethylsiloxane by graphite furnace atomic absorption spectrometry with air-oxygen double ventilation technology in edible oils

目的建立空气/氩气双通气—原子吸收石墨炉法测定食用油中二甲基硅氧烷的分析方法。方法采用航空煤油为稀释剂,按照油/溶剂(1:9,质量比)稀释后直接进入石墨炉测定。结果测定样品的相关系数为0.9986,方法检出限为0.07mg/kg,相对标准偏差为1.08%~4.74%(n=6),加标回收率为94.3%~109.7%。结论该方法快速、方便、重复性好、准确度高,适用于食用油样品的大批量检测分析。

Objective To establish a method for the analysis of polydimethylsiloxane(silicone)in edible oils by graphite furnace atomic absorption spectrometry with air-oxygen double ventilation technology.Methods Aviation kerosene was used as diluent and diluted in accordance with oil/solvent(1:9,mass ratio)and then directly into the graphite furnace for determination.Results The correlation coefficient of the calibration curves was 0.9986,the limit of detection was 0.07 mg/kg,the relative standard deviations(n=6)were 1.08%-4.74%(n=6),and the recoveries were 94.3%-109.7%.Conclusion This method is fast,convenient,repeatable and accurate,and is suitable for the detection and analysis of large quantities of edible oil samples.