【引用本文】 李津, 唐索寒, 马健雄, 等. 金属同位素质谱中分析样品处理的基本原则与方法[J]. 岩矿测试, 2021, 40(5): 627-636. doi: 10.15898/j.cnki.11-2131/td.202012150166
LI Jin , TANG Suo-han , MA Jian-xiong , et al. Principles and Treatment Methods for Metal Isotopes Analysis[J]. Rock and Mineral Analysis, 2021, 40(5): 627-636. doi: 10.15898/j.cnki.11-2131/td.202012150166

金属同位素质谱中分析样品处理的基本原则与方法

中国地质科学院地质研究所, 自然资源部同位素地质重点实验室, 自然资源部深地动力学重点实验室, 北京 100037

收稿日期: 2020-12-13  修回日期: 2021-06-29 

基金项目: 国家自然科学基金面上项目(41973020,41473005);国家重点研发计划项目(2019YFA0708400)

通信作者: 唐索寒,研究员,主要从事地球化学研究。E-mail:tangsuohan@163.com。

Principles and Treatment Methods for Metal Isotopes Analysis

Institute of Geology, Chinese Academy of Geological Sciences;Key Laboratory of Isotope Geology, Ministry of Natural Resources;Key Laboratory of Deep-Earth Dynamics, Ministry of Natural Resources, Beijing 100037, China

Corresponding author: TANG Suo-han , tangsuohan@163.com

Received Date: 2020-12-13
Revised Date: 2021-06-29

摘要:二十年来,国内外相继建立了多种金属(铁铜锌镁钙锂钼硒汞铬镉矾钡钛等)同位素的分析方法。金属同位素分析中的样品处理包括两个过程:样品的消解和样品中待测元素的分离纯化。为了获得真实、准确的金属同位素数据,样品处理过程必须遵守两个基本原则:①不引入待测元素以及可能会对待测元素同位素分析产生干扰的元素;②待测元素不发生损失。金属同位素分析常用的样品消解方法是酸溶法(包括高压闷罐法和微波消解法)。待测元素的分离纯化主要使用离子交换分离法。相同的树脂可以用于不同元素的化学分离,同一种元素也可以使用不同的树脂进行化学分离。不同类型样品的基质差异较大,需要不同的流程对待测元素进行分离。研究人员可以通过改变前人的分离流程,包括改变树脂的用量、变换淋洗液或用量、增加分离步骤等方法来满足不同样品的分离要求。本文提出了金属同位素样品处理中需要注意的一些细节:①如果消解样品时使用了高氯酸,必须将高氯酸在高温下彻底去除,因为残余的高氯酸具有强氧化性会使后续化学分离中使用的离子交换树脂失效,影响分离效果;②同一体积的树脂放入不同内径的交换柱中,树脂柱越细越长,淋洗液流速越慢、洗脱时间越长,并且待测元素洗脱出来越滞后;③离子交换过程中,每次加入的试剂体积越小,淋洗出来的元素越集中,分离效果越好。

关键词: 金属同位素, 样品处理, 消解, 离子交换分离

Principles and Treatment Methods for Metal Isotopes Analysis

KEY WORDS: metal isotopes, sample treatment, digestion, ion exchange separation

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Figures And Tables

金属同位素质谱中分析样品处理的基本原则与方法

李津, 唐索寒, 马健雄, 朱祥坤