Stable isotope fractionation of chlorine during evaporation of brinefrom a saline lake

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	Stable isotope fractionation of chlorine during evaporation of brinefrom a saline lake
	Luo ChongGuang; Xiao YingKai; Ma HaiZhou; Ma YunQi; Zhang YanLing; He MaoYong
	2012
发表期刊	CHINESE SCIENCE BULLETIN
ISSN	1001-6538
卷号	57 期号:15 页码:1833-1843
关键词	Saline Lake Brine Evaporation Chlorine Stable Isotope Fractionation
摘要	Brine from the saline Qarhan Lake was evaporated at 28 +/- 2A degrees C in a clean environment. Two groups of experiments were conducted; one with complete separation of precipitate and brine at different stages of evaporation, and the other with continuous precipitation during the evaporation. Seventy-nine precipitate and brine samples were collected during the experiments, and the Cl-37 values were determined using an improved thermal ionization mass spectrometry procedure for precise measurement of chlorine isotopes based on Cs2Cl+ ions. Based on the concentrations of Na+, K+, and Mg2+, evaporation was divided into three main precipitation stages as follows: halite dominant, carnallite dominant, and bischofite dominant. The Cl-37(solid) and Cl-37(liquid) values of the precipitate and coexisting brine samples at different stages showed the following characteristics. The precipitates were enriched with Cl-37 relative to the coexisting brine samples, and the Cl-37 of both the precipitate and brine samples decreased gradually during evaporation. The fractionation factors ( (h)) between halite and brine were the highest, followed by that ( (c)) between carnallite and brine, and then that ( (b)) between bischofite and brine. The (c) and (b) values of less than one, which indicate the precipitate is enriched in Cl-35, were found when the evaporation process entered a new stage. However, the Cl-37 values of carnallite, bischofite, and the coexisting brine samples decreased during evaporation. The residual brine is a Cl-35 reservoir. The experimental phenomena were consistent with the Cl-37 values in saline deposits in the literature. Cl-37 can be used as an indicator of brine evaporation processes, which is important in the exploration of sylvinite deposits. Brine from the saline Qarhan Lake was evaporated at 28 +/- 2A degrees C in a clean environment. Two groups of experiments were conducted; one with complete separation of precipitate and brine at different stages of evaporation, and the other with continuous precipitation during the evaporation. Seventy-nine precipitate and brine samples were collected during the experiments, and the Cl-37 values were determined using an improved thermal ionization mass spectrometry procedure for precise measurement of chlorine isotopes based on Cs2Cl+ ions. Based on the concentrations of Na+, K+, and Mg2+, evaporation was divided into three main precipitation stages as follows: halite dominant, carnallite dominant, and bischofite dominant. The Cl-37(solid) and Cl-37(liquid) values of the precipitate and coexisting brine samples at different stages showed the following characteristics. The precipitates were enriched with Cl-37 relative to the coexisting brine samples, and the Cl-37 of both the precipitate and brine samples decreased gradually during evaporation. The fractionation factors ( (h)) between halite and brine were the highest, followed by that ( (c)) between carnallite and brine, and then that ( (b)) between bischofite and brine. The (c) and (b) values of less than one, which indicate the precipitate is enriched in Cl-35, were found when the evaporation process entered a new stage. However, the Cl-37 values of carnallite, bischofite, and the coexisting brine samples decreased during evaporation. The residual brine is a Cl-35 reservoir. The experimental phenomena were consistent with the Cl-37 values in saline deposits in the literature. Cl-37 can be used as an indicator of brine evaporation processes, which is important in the exploration of sylvinite deposits.
文献类型	期刊论文
条目标识符	http://ir.isl.ac.cn/handle/363002/2055
专题	中国科学院青海盐湖研究所盐湖地质与环境实验室支撑部门青海盐湖研究所知识仓储
推荐引用方式 GB/T 7714	Luo ChongGuang,Xiao YingKai,Ma HaiZhou,et al. Stable isotope fractionation of chlorine during evaporation of brinefrom a saline lake[J]. CHINESE SCIENCE BULLETIN,2012,57(15):1833-1843.
APA	Luo ChongGuang,Xiao YingKai,Ma HaiZhou,Ma YunQi,Zhang YanLing,&He MaoYong.(2012).Stable isotope fractionation of chlorine during evaporation of brinefrom a saline lake.CHINESE SCIENCE BULLETIN,57(15),1833-1843.
MLA	Luo ChongGuang,et al."Stable isotope fractionation of chlorine during evaporation of brinefrom a saline lake".CHINESE SCIENCE BULLETIN 57.15(2012):1833-1843.

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