不同溶剂对沉积物碳酸盐组分中硼的提取和硼同位素组成的影响研究  

The Influence of Different Solvents on the Extraction of Boron and Isotopic Composition of Boron in Carbonate Sediments

作　　者：杨剑[1,2,3] 马云麒 彭章旷[1,2,3] 李海军 柴小丽 肖应凯[1,2] 张艳灵[1,2] YANG Jian;MA Yun-qi;PENG Zhang-kuang;LI Hai-jun;CHAI Xiao-li;XIAO Ying-kai;ZHANG Yan-ling(Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes,Chinese Academy of Sciences ,Xining,810008,China;Qinghai Provincial Key Laboratory of Geology and Environment of Salt Lake ,Xining,810008,China;University of Chinese Academy of Sciences,Beijing ,100049,China)

机构地区：[1]中国科学院青海盐湖研究所,中国科学院盐湖资源综合高效利用重点实验室,青海西宁810008 [2]青海省盐湖地质与环境重点实验室,青海西宁810008 [3]中国科学院大学,北京100049

出　　处：《盐湖研究》2018年第4期64-72,共9页Journal of Salt Lake Research

基　　金：国家自然科学基金项目(41473117);中国科学院关键技术人才项目(2016)

摘　　要：实验研究了不同溶剂(盐酸、醋酸、饱和EDTA-2Na盐等)对沉积物样品中的碳酸盐组分硼元素提取和硼同位素组成的影响。结果表明,1 mol/L的醋酸是溶解沉积物样品中碳酸盐组分的最佳溶剂,能将沉积物中的碳酸盐完全溶解,并有效避免样品中石膏、硅酸盐等矿物的溶出,对其中铁的氧化物等影响也比较小;同时,在过硼特效树脂前将溶液调至弱碱性所用的亚沸氨水的量较少,从而引入的本底较少。采用盐酸和饱和EDTA-2Na溶液溶解沉积物,容易将沉积物中除碳酸盐以外的矿物中的硼溶出,如石膏、硅酸盐矿物等,不利于碳酸盐组分中硼的提取。In the present work,the influence of different solvents(hydrochloric acid,Acetic acid and EDTA-2 Na solution) on the extraction of boron and isotopic composition of boron from carbonate in sediments was studied.The results show that 1 mol/L HAc is the best one for extraction of boron from carbonate in sediments,which can completely dissolve carbonate,and 1 mol/L HAc has little effect on gypsum,silicate,iron oxides and other minerals. Meanwhile,before the solution was injected into the resin,the sub-boiling ammonia was used to adjust pH to weak alkaline,and the amount of the sub-boiling ammonia was less,thus the background was less.Carbonate sediments are dissolved by hydrochloric acid and saturated EDTA-2 Na solution,which is easy to remove boron from other minerals than carbonates,such as gypsum,silicate minerals,etc.It is unfavorable to extract boron from carbonate components.

关 键 词：碳酸盐组分 盐酸 醋酸 EDTA-2Na 硼溶出量 硼同位素组成 

分 类 号：TS396.5[轻工技术与工程] P597[天文地球—地球化学]