固体进样涂层石英炉电热蒸发与原子荧光联用快速检测食品中的砷含量

Rapid determination of arsenic in food by solid injection coating quartz furnace electrothermal evaporation atomic fluorescence spectrometry

目的建立固体进样涂层石英炉电热蒸发原子荧光光谱法快速检测食品中的砷含量。方法直接使用石英样品舟准确称取粉末试样,通过涂层石英炉电热蒸发器串联原子荧光光谱仪,实现了固体试样直接进样测定食品中的As,无需消解和基体改进剂及其它试剂。结果在一定范围内砷含量与荧光值有良好的线性关系,相关系数大于0.99,检出限为0.2μg/kg,定量限为0.7μg/kg,加标回收率为88.3%~97.2%,相对标准偏差为2.12%~4.23%。结论石英炉电热蒸发器性能稳定,样品个体差异对测定无影响,满足仪器微量进样要求,可以准确、快速测定食品中砷的含量,为有效开展风险评估提供技术支撑。

Objective To establish a rapid method for the determination of arsenic in food by solid injection coating quartz furnace electrothermal evaporation atomic fluorescence spectrometry. Methods A quartz sample boat was directly used to accurately weigh and take powder samples, solid samples were directly injected to determine As in food by coated quartz furnace electric heating evaporator-atomic fluorescence spectrometer, without the need for digestion and matrix modifier and other reagents. Results There was a good linear relationship between arsenic content and fluorescence value within a certain range, and the correlation coefficient was greater than 0.99. The limit of detection was 0.2 μg/kg and the limit of quantitation was 0.7 μg/kg. The recoveries of standard addition were 88.3%-97.2%, and the relative standard deviations were 2.12%-4.23%. Conclusion The performance of the quartz furnace electrothermal evaporator is stable, and the individual differences of the samples have no effect on the determination. The requirements for micro-injection of the instrument can be met, and the content of arsenic in the food can be accurately and quickly determined, which provides technical support for effective risk assessment.