多接收等离子质谱高精度测定现代人齿中Mg同位素

引用本文: 李子夏, 贺茂勇, 逯海, 任同祥. 多接收等离子质谱高精度测定现代人齿中Mg同位素[J]. 分析化学, 2016, 44(5): 787-791. doi: 10.11895/j.issn.0253-3820.150775 shu

Citation: LI Zi-Xia, HE Mao-Yong, LU Hai, REN Tong-Xiang. Separation and Isotopic Measurement of Mg Isotope Ratios in Tooth Samples Using Multiple Collector-Inductively Coupled Plasma-Mass Spectrometry[J]. Chinese Journal of Analytical Chemistry, 2016, 44(5): 787-791. doi: 10.11895/j.issn.0253-3820.150775 shu

多接收等离子质谱高精度测定现代人齿中Mg同位素

1.
西安医学院口腔医学系, 西安 710021;
2.
中国科学院地球环境研究所黄土与第四纪国家重点实验室, 西安 710075;
3.
中国计量科学研究院, 北京 100013;
4.
陕西省加速器质谱技术及应用重点实验室, 西安 710061
基金项目:
本文系陕西省教育厅科研计划项目(No.15JK1625)资助

摘要: Mg是构成牙齿重要组分,其含量和同位素组成可记录居民生活地域、饮食习惯以及口腔健康信息等重要信息。本研究建立了高精度多接收等离子质谱(MC-ICP-MS)测定牙齿中Mg同位素方法。牙齿样品经微波消解仪消解,后采用AG50W-X8阳离子树脂分离溶液中的Mg元素,以1 mol/L HNO₃为介质上柱,40 mL 1 mol/L HNO₃洗脱Na⁺等杂质离子,再以30 mL 1 mol/L HNO₃收集Mg元素,60 mL 1 mol/L HNO₃洗去其它杂质,蒸干Mg收集液。MC-ICP-MS进行Mg同位素组成测定。MC-ICP -MS仪器自身的质量分馏利用"样品-标准"交叉技术("Sample-standard" bracketing technique)解决。实验结果表明,利用AG50W-X8阳离子树脂,可在保证Mg回收率的情况下,将牙齿样品中的Mg和其它基质元素彻底分离,且不造成同位素分馏。采用此方法对现代人离体牙牙釉质中Mg同位素进行分离测定,牙齿的δ²⁶Mg在较大的范围变化(-1.38‰~4.59‰)。本方法为利用人牙齿中Mg同位素研究Mg的暴露水平、环境污染等信息提供重要的实验和理论依据。

关键词:

English

Separation and Isotopic Measurement of Mg Isotope Ratios in Tooth Samples Using Multiple Collector-Inductively Coupled Plasma-Mass Spectrometry

1.
Department of Stomatology, Xi'an Medical University, Xi'an 710021, China;
2.
State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710061, China;
3.
National Institute of Metrology, Beijing 100013, China;
4.
Shaanxi Provincial Key Laboratory of Accelerator Mass Spectrometry Technology and Application, Xi'an 710061, China
Received Date: 05 October 2015
Revised Date: 24 December 2015

Abstract: Major cation Mg²⁺ was presented in enamel as major substituted species. The quantity of Mg and the Mg isotopic ratio in tooth can provide information on the environment, dietary habits, and oral health of individuals. As a result, a method was developed for the determination of Mg isotope based on high-precision multiple collector-inductively coupled plasma-mass spectrometry (MC-ICP-MS). The samples were dissolved using a microwave digestion system. Separation of Mg was achieved by cation exchange chromatography of AG50W-X8. The sample solutions were loaded on the resin with 1 mol/L HNO₃, the other ions such as Na⁺ were eluted with 40 mL of HNO₃ (1 mol/L), and then the Mg was eluted with 30 mL of HNO₃ (1 mol/L), finally the resin was washed with 60 mL of HNO₃ (1 mol/L). The Mg isotope was measured using multiple collector-inductively coupled plasma-mass spectrometry (MC-ICP-MS). The "sample-standard" bracketing technique was used to correct the instrumental mass bias. The results show that the fast and effective method can be used for the separation, pre-concentration and determination of Mg isotope in calcium-rich tooth samples. Giving values of ²⁶Mg were from -1.38‰ to 4.59‰. The established method for Mg isotope determination provides an important scientific basis for ancient population migration, ancient diet analysis and disease by Mg isotope of ancient human teeth.

Key words:

Magnesium isotope
/ Tooth
/ Multiple collector-inductively coupled plasma-mass spectrometry

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多接收等离子质谱高精度测定现代人齿中Mg同位素

English

Separation and Isotopic Measurement of Mg Isotope Ratios in Tooth Samples Using Multiple Collector-Inductively Coupled Plasma-Mass Spectrometry

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通讯作者: 陈斌, bchen63@163.com

中国化学会秘书处

多接收等离子质谱高精度测定现代人齿中Mg同位素

English

Separation and Isotopic Measurement of Mg Isotope Ratios in Tooth Samples Using Multiple Collector-Inductively Coupled Plasma-Mass Spectrometry

CCS Chemistry：嵌段共聚物自组装成 “三明治”二维有机材料，实现纳米级压力传感功能

CCS Chemistry：颜徐州、鲍哲南： 你的皮肤可能是一片SPMs

CCS Chemistry：工作高效不疲劳，只须让催化剂动起来

CCS Chemistry：静电组装导向聚合- 聚电解质纳米凝胶量化制备新策略

CCS Chemistry：金黄色葡萄球菌醛基脱氢酶是如何识别特异性底物的？

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