电感耦合等离子体质谱-扩展标准加入法快速测定食盐中铅含量

Rapid Determination of Lead in Salt by Inductively Coupled Plasma Mass Spectrometry Extended Standard Addition Method

本文通过对雾化器、稀释气流量和甲醇浓度等条件进行优化,建立了电感耦合等离子体质谱-扩展标准加入法快速测定食盐中铅含量的方法。经方法学验证,检出限为0.002 mg/kg,定量限为0.006 mg/kg,结果精密度为1.7%~1.9%,加标回收率为85.3%~101.3%,均符合食品理化检测方法的技术要求。结果表明,本文建立的电感耦合等离子体质谱-扩展标准加入法满足食盐中铅含量的测定,且灵敏度高、精密度高、操作简单,为食盐中铅含量的测定提供了技术支撑。

By optimizing the atomizer,dilution gas flow and methanol concentration,a rapid method for the determination of lead in table salt by inductively coupled plasma mass spectrometry extended standard addition method was established.After methodological verification,the detection limit was 0.002 mg/kg,the quantitative limit was 0.006 mg/kg,the precision was 1.7%~1.9%,and the recovery rate was 85.3%~101.3%,which met the technical requirements of food physical and chemical detection methods.The results show that the inductively coupled plasma mass spectrometry extended standard addition method established in this paper can meet the determination of lead content in salt,and has high sensitivity,high precision and simple operation,which provides technical support for the determination of lead content in salt.