第8卷第3期 2017年3月
食品安全质量检测学报 Journal of Food Safety and Quality
Vol. 8 No. 3 Mar.，2017
电感耦合等离子体质谱法测定生活饮用水中
7种金属元素
王伟，江小明，杨永，何平，彭鸣，朱有涛
(武汉食品化妆品检验所，武汉430000)
摘要：目的建立电感耦合等离子体质谱法测定生活饮用水中7种常见金属元索的分析方法，了解武汉市水质状况。方法样品经过膜过滤、酸化(2%HNO,)处理后，用电感耦合等离子体质谱仪(inductivelycoupled plasmasourcemassspectrometer,ICP-MS)进行分析，选择混合内标校正非质谱干扰。结果该方法线性良好，相关系数均大于0.9998。方法检出限0.0006~0.015μg/L，定量限0.0020~0.050μg/L。各元素加标回收率在 84.3%~104.5%之间，测定结果相对标准偏差RSD在0.72%~6.89%之间。实验室比对分析结果令人满意。结论
该方法简单、快速、准确，能适用于水中多种金属元素的测定。关键词：电感耦合等离子体质谱法；生活饮用水；金属元素
Determination of 7metal elements in drinking waterby inductively coupled
plasmamassspectrometry
WANGWei, JIANG Xiao-Ming,YANG Yong,HEPing,PENG Ming,ZHUYou-Tao
(Wuhan Institute for Food and Cosmetic Control, Wuhan 430000, China)
ABSTRACT: ObjectiveTo establish a method for the determination of 7 metal elements in drinking water by inductively coupled plasma mass spectrometry (ICP-MS), and monitor the status of water quality in Wuhan. Methods Water samples were detected by ICP-MS after filtration and acidification (2% HNO,). The mass spectrum interference was eliminated by the intermal standards. ResultsThe method showed good linearities and the correlation coefficients were all greater than 0.9998. The detection limits were obtained between 0.0006~0.015 μg/L, and the limits of quantification were between 0.0020~0.050 μg/L. The recovery rates were between 84.3%~104.5%, with the relative standard deviations (RSD) between 0.72%~6.89%. The results of laboratory comparison were satisfactory. ConelusionThe established method is simple, rapid, and accurate, which is applicable to the determination of metal elements in water.
KEY WORDS: inductively coupled plasma mass spectrometry; drinking water; metal elements
1引言
生活饮用水影响到生活的方方面面，其质量持续受到人们重点关注，尤其是水中金属元素更是直接影响到每
个人的健康。日常水质检测中，根据国家标准，金属元素划分为毒理指标、一般化学指标和水质非常规指标3大类。其中，铅、碑、镉、硒属于毒理指标，锰、铜属于一般化学指标，锁属于水质非常规指标"。这些元素均是水质检
*通讯作者：江小明，高级工程师，主要研究方向为食品分析。E-mail:944703609@qq.com
*Corresponding author: JIANG Xiao-Ming, Senior Engineer, State Key Laboratory of Food Analysis, Wuhan Institute for Food and Cosmetic Control,
Wuhan 430000, China. E-mail: 944703609@qq.com 万方数据