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《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

卷:

第33卷

期数:

2011年第04期

页码:

397-401

栏目:

水资源与环境

出版日期:

2011-12-15

文章信息/Info

Title:

Novel Method of Bromine Isotope Measurement in Groundwater by Gas Bench Ⅱ-IRMS

文章编号:

1672-6561(2011)04-0397-05

作者:

杨杰¹; 2; 马腾¹; 2; 刘玲¹; 2; 3; 刘存富¹; 2; 单慧媚¹; 2; 陈柳竹¹; 2

1.中国地质大学生物地质与环境地质国家重点实验室,湖北武汉430074;2.中国地质大学环境学院, 湖北武汉430074;3.环境保护部环境规划院,北京100012

Author(s):

YANG Jie¹; 2; MA Teng¹; 2; LIU Ling¹; 2; 3; LIU Cun-fu¹; 2; SHAN Hui-mei¹; 2; CHEN Liu-zhu¹; 2

1. State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430074,Hubei, China; 2. School of Environmental Studies, China University of Geosciences, Wuhan 430074, Hubei, China; 3. Chinese Academy for Environmen

关键词:

溴; 同位素; GasBenchⅡ; 质谱分析; 地下水

Keywords:

bromine;  isotope;  Gas Bench Ⅱ;  mass spectrometric analysis;  groundwater

分类号:

P641.3

DOI:

-

文献标志码:

A

摘要:

建立了利用GasBenchⅡ联用同位素比值质谱仪(GasBenchⅡ-IRMS)用于测定地下水中溴稳定同位素的方法。基于溴比氯更容易被重铬酸钾氧化的性质,将Br^-氧化成Br₂,而氯残留在原溶液中,从而把溴与氯分离开;再利用AgNO₃将溴以AgBr的形式沉淀下来,然后将AgBr转化成CH₃Br进行溴稳定同位素质谱测定。反应中,CH₃I用量为20μL,AgBr用量为0.5mg。本测试流程需溴4～10mg,质谱测试时间由1.5h缩短为800s,测试精度优于±0.1‰(2σ)。该方法可以用于地下水中溴同位素测定,在水文地质研究中具有广阔的应用前景。

Abstract:

The novel method of bromine stable isotope measurement by Gas Bench Ⅱ-IRMS was developed. Based on the chemical properties that bromine is easier to be oxidized than chloride by K₂Cr₂O₇, Br^- is oxidized to Br₂ while chloride still leaves in the solution, so bromine could be separated from chloride; bromide is precipitated in the form of AgBr by AgNO₃, and then AgBr was converted into CH₃Br for bromine stable isotope mass spectrometry analysis. In the chemical reaction, 20 μL CH₃I and 0.5 mg AgBr were used. For the whole experiment, 4-10 mg bromine was used, the time of mass spectrometry analysis decreased from 1.5 h to 800 s, and the precision is better than ±0.1‰(2σ). The method could be used to determine bromine isotope in groundwater, and have a wide application in hydrogeology.

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备注/Memo

备注/Memo:

收稿日期:2011-06-07
基金项目: 国家自然科学基金项目(40872157; 40830748); 教育部新世纪优秀人才支持计划项目(NCET-07-0773); 中央高校基本科研业务费专项基金项目(CUGL100501); 高等学校学科创新引智计划项目(B08030)
作者简介: 杨 杰(1986-),女,湖北天门人,工学硕士研究生,从事同位素水文地质和地下水污染与防治研究。E-mail:famabrasi@yahoo.com.cn

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更新日期/Last Update: 2011-12-20