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采用ICP-MS/MS准确测定食品中钙和氯

Accurate Determination of Calcium and Chlorine in Food with Inductively Coupled Plasma Tandem Mass Spectrometry

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摘要

建立利用电感耦合等离子体串联质谱测定食品中钙和氯的分析方法。 针对Ca的高丰度同位素40Ca受到来自等离子气40Ar的干扰, 35Cl受到来自16O18OH的严重干扰, 在MS/MS模式下, 利用碰撞/反应池技术, 以H2为反应气, 使40Ar+与H2发生反应, 而40Ca+不与H2发生反应, 利用H2原位质量法消除40Ar+对40Ca+的干扰; 而35Cl+则能与H2发生质量转移反应生成H235Cl+, 通过测定H235Cl+消除16O18OH+对35Cl+的干扰。 Ca和Cl在0.0~100.0 μg·L-1的浓度范围内线性关系良好, 线性相关系数(R2)≥0.999 9, Ca和Cl的检出限分别为0.061和2.32 μg·L-1。 采用系列国家标准物质验证了对方法的准确性和精密度, 其测定结果与标准参考物质的认定值基本一致, 表明方法的准确性好、 精密度高。 所建立的新方法可实现食品中钙和氯的准确测定。

Abstract

An analytical method for the determination of Ca and Cl elements in food was established with inductively coupled plasma tandem mass spectrometry (ICP-MS/MS). The most abundant isotope 40Ca of Ca is suffering from intense interferences from the 40Ar among the argon plasma gas, and 35Cl is subjected to interference from 16O18OH. To avoid the interference, in the MS/MS mode, collision/reaction cell (CRC) was adopted using H2 as the reaction gas, so that H2 will reach with 40Ar+ instead of 40Ca+, A H2 on-mass method was used to eliminate the interference of 40Ar+ on 40Ca+. As mass shift reaction could take place between 35Cl+ and H2 to generate H235Cl+, thus the interference of 16O18OH+ on 35Cl+ can be eliminated by determining H235Cl+. Ca and Cl showed good linearity in the concentration range of 0.0~100.0 μg·L-1 with linear correlation coefficient (R2)≥0.999 9, and the detection limits of Ca and Cl were 0.061 and 2.32 μg·L-1, respectively. The accuracy and precision of this method were verified by series of national standard materials. The results of this method were basically consistent with the certified values of the reference materials, indicating that the method of good accuracy and high precision. The new method can be used to achieve the accurate determination of Ca and Cl in food.

Newport宣传-MKS新实验室计划
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中图分类号:O657.3

DOI:10.3964/j.issn.1000-0593(2018)11-3567-05

基金项目:国家自然科学基金面上项目(81603400), 湖南省教育厅重点科研项目(14A035), 湖南省重点学科建设项目(湘教发[2011]76号)资助

收稿日期:2017-08-07

修改稿日期:2018-01-16

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周学忠:湖南工学院材料与化学工程学院, 湖南 衡阳 421002
刘宏伟:湖南工学院材料与化学工程学院, 湖南 衡阳 421002

联系人作者:周学忠(zxz106909@163.com)

备注:周学忠, 1966年生, 湖南工学院材料与化学工程学院高级实验师

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引用该论文

ZHOU Xue-zhong,LIU Hong-wei. Accurate Determination of Calcium and Chlorine in Food with Inductively Coupled Plasma Tandem Mass Spectrometry[J]. Spectroscopy and Spectral Analysis, 2018, 38(11): 3567-3571

周学忠,刘宏伟. 采用ICP-MS/MS准确测定食品中钙和氯[J]. 光谱学与光谱分析, 2018, 38(11): 3567-3571

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