电感耦合等离子体质谱与电感耦合等离子体发射光谱测定绿叶蔬菜重金属的方法比较

发布时间：2018-06-13 14:30

本文选题：电感耦合等离子体质谱 + 电感耦合等离子体发射光谱　；参考：《土壤通报》2017年05期

【摘要】：比较了电感耦合等离子体质谱(Inductively coupled plasma mass,ICP-MS)/电感耦合等离子体发射光谱(Inductively coupled plasma optical emission spectrometry,ICP-OES)两种方法的检测限、精密度和准确度,并对绿叶蔬菜(芹菜)中Cr、Cu、Zn、Cd和Pb的含量分别进行了测定。主要结果如下:1)ICP-MS具有更高的灵敏度,测定的5种元素的检测限在0~0.29μg kg-1;ICP-OES测定的检测限在0~0.059 mg kg-1。两种方法的精密度均较高,ICP-MS测定的相对标准偏差RSD(%)在1.98%~4.87%、ICP-OES的RSD(%)在2.19%~4.79%。两种方法测定标准土壤的回收率在75%以上、测定芹菜Cr、Cu、Zn和Cd的加标回收率都在90%以上。然而,ICP-MS未检测出Pb,ICP-OES测定Pb的加标回收率为60%~80%。2)T检验分析的结果表明,ICP-MS测定芹菜Cr、Cu和Zn的值显著高于ICP-OES(P0.05),但是Cd的值显著低于ICP-OES(P0.05)。3)ICP-MS、ICP-OES都是以等离子体为发射源的光谱分析技术,但是由于两者在工作原理、测定条件等方面不尽相同而给测定结果带来偏差。研究可以为两种方法测定绿叶蔬菜的重金属提供一定技术指导、为食品安全的监督和管理提供一定依据。
[Abstract]:The detection limits, precision and accuracy of inductively coupled plasma mass spectrometry (inductively coupled plasma mass) ICP-MSO / inductively coupled plasma optical emission spectrometric ICP-OESwere compared, and the contents of Cr ~ (2 +) Cu ~ (2 +) Zn ~ (2 +) (CD) and Pb in green leafy vegetables (celery) were determined respectively. The main results are as follows: (1) ICP-MS has higher sensitivity. The detection limit of the five elements is 0 ~ 0.29 渭 g / kg ~ (-1) and the detection limit of ICP-OES is 0 ~ 0.059 mg / kg ~ (-1). The precision of both methods was higher than that of ICP-MS. The RSDs of ICP-MS were 1.98 and 4.87, and the RSDs of ICP-OES were 2.19 and 4.79. The recoveries of the two methods for the determination of standard soil were more than 75%, and the recoveries for the determination of Cr ~ (2 +) Cu ~ (2 +) Zn and CD in celery were above 90%. However, ICP-MS did not detect that the standard recovery of Pb determined by PbP- ICP-OES was 60 and the results showed that the determination of CrnCu and Zn in celery by ICP-MS was significantly higher than that by ICP-OES0. 05, but the CD value was significantly lower than that of ICP-OESP0. 05. 3 ICP-MSOES with plasma as emission source. However, because of the difference in working principle and measuring conditions, the results are deviated. The study can provide some technical guidance for the determination of heavy metals in green leafy vegetables by two methods, and provide some basis for the supervision and management of food safety.
【作者单位】：南京农业大学资源与环境科学学院;
【基金】：南京农业大学中央高校基本科研业务费科技平台实验技术项目江苏省高校品牌专业建设工程(PPZY2015A061)资助
【分类号】：O657;X836

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