石墨炉原子吸收光谱法和电感耦合等离子体质谱法测定香辛料中的铅

Determination of lead content in spices products by atomic absorption spectrometry and inductively coupled plasma mass spectrometry

目的比较石墨炉原子吸收光谱法和电感耦合等离子体质谱法测定香辛料中的铅含量。方法采用GB 5009.12—2017《食品安全国家标准食品中铅的测定》第一法石墨炉原子吸收光谱法和GB 5009.268—2016《食品安全国家标准食品中多元素的测定》第二法电感耦合等离子体质谱法,用2种不同方法对市场上抽取的香辛料中的铅含量进行测定,同时比较2种方法的准确度、重复性、精密度,通过测定加标样和质控样中铅的含量,验证其准确性和可靠性。结果石墨炉原子吸收光谱法的平均加标回收率为76.4%,相对标准偏差为6.1%;电感耦合等离子体质谱法的平均加标回收率为97.3%,相对标准偏差为0.4%。结论电感耦合等离子体质谱法的回收率高于石墨炉原子吸收光谱法,且准确度高、稳定性好、分析速度快。

Objective To compare the determination of lead content in spices products by atomic absorption spectrometry and inductively coupled plasma mass spectrometry. Methods The first method of GB 5009.12—2017 "National food sdfety standard-Determination of lead in food first method-tomic absorption spectrometry" graphite furnace atomic absorption spectrometry and the second method of GB 5009.268—2016 "National food sdfety standard-Determination of muti-elements in food second method-inductively coupled plasma mass spectrometry" inductively coupled plasma mass spectrometry were used to determine the content of lead in spices extracted from the market. The accuracy, repeatability and precision of the two methods were compared at the same time. The accuracy and reliability of the two methods were verified by measuring the content of lead in standard sample and quality control sample. Results The average recoveries of tomic absorption spectrometry was 76.4%. The relative standard deviation was 6.1%. The average recoveries of inductively coupled plasma mass spectrometry was 97.3%. The relative standard deviation was 0.4%. Conclusion The recovery rate of inductively coupled plasma mass spectrometry is higher than that of graphite furnace atomic absorption spectrometry, and it has high accuracy, good stability and fast analysis speed。