摘要
目的:本文建立了一种结合微波消解与电感耦合等离子体质谱法的重金属检测方法,探讨不同取样方式(根茎肉、全样和表皮)对白萝卜、胡萝卜、马铃薯和生姜中铬、砷、镉和铅含量的影响.方法:通过线性相关性、检出限、定量限、加标回收率和重复性验证检测方法的适用性,并探究不同取样方式对 4种块根块茎类蔬菜中重金属含量的影响.结果:在 0.5～20.0 μg·L-1,该方法具有良好的线性关系,且检出限和定量限较低,回收率为 90.1%～108.0%,相对标准偏差为 0.6%～3.5%.表皮处理组 4 种蔬菜中检测到最高的重金属含量,且去皮与否对白萝卜、马铃薯和生姜中的铬含量,白萝卜和马铃薯中的砷含量,以及白萝卜和生姜中的铅含量有显著影响(P＜0.05).结论:本方法适用于检测白萝卜、胡萝卜、马铃薯和生姜中铬、砷、镉和铅的含量.重金属主要集中于表皮组织,去皮处理可能显著影响检测结果.
Abstract
Objective:This study establishes a method for detecting heavy metals that combines microwave digestion with inductively coupled plasma mass spectrometry(ICP-MS).It explores the impact of different sampling methods(root tissue,whole sample,and peel)on the contents of chromium,arsenic,cadmium,and lead in white radishes,carrots,potatoes,and ginger.Method:The applicability of the detection method was validated through linear correlation,detection limits,quantification limits,recovery rates of spiked samples,and repeatability.The effects of different sampling methods on heavy metal content in the four root vegetables were also determined.Result:In the range of 0.5～20.0 μg·L-1,the method had a good linear relationship with low limits of detection and quantitation.The recoveries were 90.1%to 108.0%and the relative standard deviations were 0.6%to 3.5%.The highest heavy metal content was detected in the skin treatment group,and the chromium content in white radish,potato and ginger,the arsenic content in white radish and potato,and the lead content in white radish and ginger were significantly affected(P＜0.05).Conclusion:This method is suitable for the determination of chromium,arsenic,cadmium and lead in white radish,carrot,potato and ginger.Heavy metals are mainly concentrated in the epidermal tissue,and peeling treatment may significantly affect the detection results.
维普
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