绿茶中6种重金属元素的质谱分析  

Determination of 6 Kinds of Heavy Metal Elements in Green Tea by Inductively Coupled Plasma Mass Spectrometry

作　　者：蒙华毅[1] 梁书怀[1] 吴祖军[1] 雷宁生[1] 陈广林[1] Meng Huayi;Liang Shuhuai;Wu Zujun;Lei Ningsheng;Chen Guanglin(Guangxi Center for Disease Prevention and Control,Nanning 530028,China)

机构地区：[1]广西壮族自治区疾病预防控制中心,广西南宁530028

出　　处：《广东化工》2022年第18期201-202,共2页Guangdong Chemical Industry

基　　金：广西壮族自治区疾病预防控制中心青年基金课题(202002)。

摘　　要：绿茶样品经HNO_(3)-H_(2)O_(2)密闭高压消解后,以(74)^Ge、(115)^In、(209)^Bi、(45)^Sc为内标元素消除非质谱干扰,在动态反应池中加入氨气消除质谱干扰,采用电感耦合等离子体质谱法同时测定了绿茶中铅、镉、砷、铬、钒和钴含量。在最佳的实验参数下,各元素在0.05~100μg/L浓度范围内与元素含量的强度呈现良好的线性关系(R>0.999),铅、镉、砷、铬、钒和钴的检出限分别为0.004,0.001,0.005,0.001,0.008,0.001 mg/kg。方法经国家有证标准物质绿茶(GBW10052)验证,结果与标示值相符。方法用于绿茶样品的检测,结果显示,六种元素的含量远低于国家有关限量标准(NY 659-2003),适用于绿茶中痕量元素的快速分析。Green tea were digested by sealed high pressure digestion with HNO_(3)-H_(2)O_(2),(74)^Ge,(115)^In,(209)^Bi and (45)^Sc were used as the internal standard elements to overcome non-spectroscopic interference and Ammonia was used as dynamic reaction gas to eliminate mass spectroscopic interference.The contents of lead,cadmium,arsenic,chromium,vanadium and cobalt in green tea were determined by inductively coupled plasma mass spectrometry.Under optimum experimental parameters,the linear range of this method was 0.05~100μg/L with elemental correlation coefficients over 0.999,and the limits of detection for Pb,Cd,As,Cr,Sn,Ni were 0.004,0.001,0.005,0.001,0.008,0.001 mg/kg,respectively.The proposed method The method was verified by the national certified reference material green tea(GBW10052),and the results were consistent with the marked values.The method was applied to the determination of green tea samples.The results showed that the contents of six elements were far lower than the relevant national limit standards(NY 659-2003),which was suitable for the rapid analysis of trace elements in green tea.

关 键 词：密闭高压消解 绿茶 电感耦合等离子体质谱法 元素 

分 类 号：TQ[化学工程]