多接收等离子质谱高精度测定现代人齿中Mg同位素
发布时间：2019-05-10 02:02
【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 HNO_3为介质上柱,40 m L1 mol/L HNO_3洗脱Na~+等杂质离子,再以30 m L 1 mol/L HNO_3收集Mg元素,60 m L 1 mol/L HNO_3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δ~(26)Mg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。
[Abstract]:Mg is an important component of teeth. Its content and isotopic composition can record important information such as living area, eating habits and oral health information. In this study, a high precision multi-receiver plasma mass spectrometry (MC-ICP-MS) method for the determination of Mg isotopes in teeth was established. The tooth samples were digested by microwave digestion instrument, and then the Mg elements in the solution were separated by AG50W-X8 cationic resin. The impurity ions such as Na~ were eluted by 40 ml mol/L HNO_3 on a column with 1 mol/L HNO_3 as medium. Then Mg elements were collected with 30 mL 1 mol/L HNO_3, and other impurities were washed away by 60 mL 1 mol/L HNO_3. Evaporated Mg collection solution. MC-ICP-MS is used for the determination of Mg isotopic composition. The mass fractionation of MC-ICP-MS instrument itself is solved by "sample-standard" cross technique ("Sample-standard" bracketing technique). The experimental results show that AG50W-X8 cationic resin can completely separate Mg from other matrix elements without isotopic fractionation under the condition of ensuring the recovery of Mg. This method was used to separate and determine the Mg isotope in the enamel of modern human teeth. The 未 ~ (26) Mg of the teeth varied in a wide range (! 1.38 鈥，
本文编号：2473262
[Abstract]:Mg is an important component of teeth. Its content and isotopic composition can record important information such as living area, eating habits and oral health information. In this study, a high precision multi-receiver plasma mass spectrometry (MC-ICP-MS) method for the determination of Mg isotopes in teeth was established. The tooth samples were digested by microwave digestion instrument, and then the Mg elements in the solution were separated by AG50W-X8 cationic resin. The impurity ions such as Na~ were eluted by 40 ml mol/L HNO_3 on a column with 1 mol/L HNO_3 as medium. Then Mg elements were collected with 30 mL 1 mol/L HNO_3, and other impurities were washed away by 60 mL 1 mol/L HNO_3. Evaporated Mg collection solution. MC-ICP-MS is used for the determination of Mg isotopic composition. The mass fractionation of MC-ICP-MS instrument itself is solved by "sample-standard" cross technique ("Sample-standard" bracketing technique). The experimental results show that AG50W-X8 cationic resin can completely separate Mg from other matrix elements without isotopic fractionation under the condition of ensuring the recovery of Mg. This method was used to separate and determine the Mg isotope in the enamel of modern human teeth. The 未 ~ (26) Mg of the teeth varied in a wide range (! 1.38 鈥，
本文编号：2473262
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