岩矿测试

文章摘要

李海涛,杨鑫,雷华基,杨艳,靳兰兰,胡圣虹.镉稳定同位素研究进展[J].岩矿测试,2021,(1):1-15

LI Hai-tao,YANG Xin,LEI Hua-ji,YANG Yan,JIN Lan-lan,HU Sheng-hong.Research Progress of Cadmium Stable Isotopes[J].Rock and Mineral Analysis,2021,(1):1-15.DOI:10.15898/j.cnki.11-2131/td.202012090160

镉稳定同位素研究进展

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Research Progress of Cadmium Stable Isotopes

投稿时间：2020-12-09 修订日期：2020-12-30

DOI：10.15898/j.cnki.11-2131/td.202012090160

基金项目:国家自然科学基金项目（41773013）；国家重点研发计划项目“农田地质高背景重金属污染机理研究”（2017YFD0800300）

作者	单位	E-mail
李海涛	中国地质大学(武汉)地球科学学院, 生物地质与环境地质国家重点实验室, 湖北武汉 430074	shhu@cug.edu.cn
杨鑫	中国地质大学(武汉)地球科学学院, 生物地质与环境地质国家重点实验室, 湖北武汉 430074
雷华基	中国地质大学(武汉)地球科学学院, 生物地质与环境地质国家重点实验室, 湖北武汉 430074
杨艳	中国地质大学(武汉)地球科学学院, 生物地质与环境地质国家重点实验室, 湖北武汉 430074
靳兰兰	中国地质大学(武汉)地球科学学院, 生物地质与环境地质国家重点实验室, 湖北武汉 430074
胡圣虹	中国地质大学(武汉)地球科学学院, 生物地质与环境地质国家重点实验室, 湖北武汉 430074

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中文摘要:

Cd具有挥发性和亲硫性，在海洋环境中Cd为微量营养元素，而在生态环境及农业土壤环境中Cd为有毒元素。因此，镉同位素被应用于海洋科学、地球科学、环境科学及农业科学研究，并展现出巨大的应用潜力。本文总结了近年来富含有机质的环境样品、植物样品和生物样品的消解方法，以及Cd分离纯化及双稀释剂校正方法的研究进展。采用微波、高压灰化和高氯酸消解等样品前处理方法均可消除有机质对镉同位素测定的影响；基于AG MP-1（M）树脂-盐酸淋洗体系可有效分离基体及干扰元素，不会导致镉同位素分馏；¹¹¹Cd-¹¹³Cd同位素双稀释剂校正体系的测试精度高，可达0.1εCd/amu。同时，本文阐述了镉同位素在海洋科学、地球科学、环境科学及农业科学领域研究的最新进展和认识。镉同位素已成功应用于构建海洋生物地球化学Cd循环体系、反演古海洋环境及初级生产力变化，硫化物矿床成矿流体演化、成矿物质来源示踪及不同成因矿床类型判别研究，环境体系Cd污染源的源区判别、农田面源Cd来源及其运移、循环及储存机制研究。本文提出需要进一步开展镉同位素分馏机制及分馏模型的研究，构建Cd稳定同位素地球化学体系。

英文摘要:

BACKGROUND: Cadmium is a volatile element with chalcophile affinity. In the marine environment, Cd is a micronutrient element, while in the ecological environment and agricultural soil environment, Cd is a toxic element. Therefore, Cd isotopes have been used in marine science, earth science, environmental science, and agricultural scientific research, and show great application potential.
OBJECTIVES: To summarize the high-precision analytical technology and applications of Cd isotopes in different research fields.
METHODS: The recent research progress in digestion methods, separation and purification of Cd, and double-spikes calibration methods for organic matter-rich environmental samples, plant samples and biological samples were summarized.
RESULTS: For organic matter-rich samples including environmental, plant and biological samples, microwave digestion, high-pressure ashing and perchloric acid digestion can eliminate the influence of organic matter in Cd isotope analysis. Combined AG MP-1(M) resin with hydrochloric acid leaching system can effectively separate the matrix and interfering elements, which will not result in Cd isotope fractionation. The precision of Cd isotope with ¹¹¹Cd-¹¹³Cd isotope double-spike correction was around 0.1εCd/amu. The application of Cd isotopes in marine science, geoscience, environmental science, and agricultural science were also summarized in this paper. Cadmium isotopes were used successfully for building marine biological geochemistry cycles, inversion of ancient marine environments and primary productivity change. In sulfide deposits, Cd isotopes were used to trace the evolution of ore fluids and the source of ore metals, and to discriminate different deposit types. In environmental systems, Cd isotopes were applied to distinguish Cd pollution sources, and to investigate Cd sources, migration, circulation and storage mechanisms in agricultural sciences.
CONCLUSIONS: The research of the high-precision Cd isotope analytical method and Cd isotope fractionation mechanism and model, will promote to establishment the tracer system of Cd isotope biogeochemistry fractionation and innovative development of non-traditional stable isotope geochemistry.

主管单位：	中国科学技术协会
主办单位：	中国地质学会岩矿测试技术专业委员会国家地质实验测试中心