易腐叶菜类蔬菜中微量元素的ICP-MS半定量分析方法研究

Semiquantitative Analysis of Trace Elements in Perishable Leafy Vegetables by ICP-MS

蔬菜是居民生活中必不可少的农产品,其中,叶菜类蔬菜易积累重金属,存在较大的安全风险。因此,叶菜等易腐蔬菜的微量元素快速分析至关重要。本文采用电感耦合等离子体质谱法建立了易腐叶菜类蔬菜微量元素分析的标准模式下半定量分析方法。称取0.5~0.8 g样品,加入5 mL硝酸消解完成后,采用标准模式-电感耦合等离子体质谱法进行半定量测定。通过对GSB-26芹菜粉标准物质及对样品加标回收的半定量分析,结果表明,该方法能够实现对铝、铬、锰、镉、铅等微量元素的快速测定,结果偏差为-28.9%~-9.3%,实际样品回收率为71.1%~90.7%。该方法能快速确定样品中存在的微量元素及浓度范围,可应用于对易腐叶菜类蔬菜元素含量的扫描分析,为快速分析评价易腐叶菜类蔬菜微量元素提供科学依据。

Vegetables are important agricultural products essential to residents’life.Among them,leafy vegetables are easy to accumulate heavy metals and have great safety risks.Therefore,the rapid analysis of trace elements in part of leaf vegetables perishable varieties is very important.In this study,inductively coupled plasma mass spectrometry was used to establish a semiquantitative analysis method of trace elements in perishable leafy vegetables under standard mode.0.5-0.8 g samples were weighed and 5 mL of nitric acid was added to complete digestion.Standard mode inductively coupled plasma mass spectrometry(ICP-MS)was used for semiquantitative determination.The semiquantitative analysis of GSB-26 celery powder standard substance and the recovery of the sample showed that the method could achieve the rapid determination of aluminum,chromium,manganese,cadmium,lead and other elements,the deviation was from-28.9%to-9.3%,and the actual sample recovery was 71.1%-90.7%.This method could quickly determine the trace elements in samples and the concentration range,and could be applied to scanning analysis of elements in perishable leafy vegetables,providing a scientific basis for rapid analysis and evaluation of trace elements in perishable leafy vegetables.