ISL OpenIR  > 青海盐湖研究所知识仓储
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
Source PublicationCHINESE SCIENCE BULLETIN
ISSN1001-6538
Volume57Issue:15Pages:1833-1843
AbstractBrine 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.
KeywordSaline Lake Brine Evaporation Chlorine Stable Isotope Fractionation
Indexed BySCI
Document Type期刊论文
Identifierhttp://ir.isl.ac.cn/handle/363002/2055
Collection青海盐湖研究所知识仓储
Recommended Citation
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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