Kurnakovite deposits on the Qinghai-Tibet Plateau (II): an investigation from chemical kinetics of chloropinnoite dissolution

ISL OpenIR > 青海盐湖研究所知识仓储

	Kurnakovite deposits on the Qinghai-Tibet Plateau (II): an investigation from chemical kinetics of chloropinnoite dissolution
	Li, X.1; Gao, S.2,3; Liu, Z.2,3; Xia, S.2,3
	2013-10-01
发表期刊	ENVIRONMENTAL EARTH SCIENCES
卷号	70 期号:3 页码:1151-1158
关键词	Kurnakovite Chloropinnoite Kinetics And Mechanism Geochemical Kinetics Qinghai-tibet Plateau
摘要	Lakes on the Qinghai-Tibet Plateau (QTP) are of particular interest to researchers because of their unusual high concentrations of lithium (Li), boron (B), and potassium (K). Kurnakovite, a member of the inderite group, is well-distributed on the QTP, however, the geochemical mechanisms of kurnakovite transformation requires further identification and clarification. This study aims to elucidate the geochemical mechanisms of kurnakovite deposits on the QTP from chloropinnoite dissolution using chemical kinetic and spectroscopic techniques. The new borate, chloropinnoite 2MgO center dot A 2B(2)O(3) center dot A MgCl2 center dot A 14H(2)O, was obtained from the natural concentrated salt lake brine on the QTP. The kinetics of chloropinnoite dissolved in 4.5 % (wt%) boric acid solution at 303, 313, and 323 K were investigated. The characterization of the phase transitions and the kinetics were carried out by chemical titration analysis, X-ray powder diffraction spectrometry, Fourier Transform Infrared (FT-IR), and Raman spectrometry. The results demonstrate that similar kinetic processes occur at all three temperatures and can be divided into dissolution, supersaturation, and precipitation, according to three distinct kinetic curves. Kurnakovite was the final phase transition (terminal secondary mineral) within the chloropinnoite-boric acid solution. The dissolution rate of chloropinnoite (the dissolution stage) could be described by second order pseudo-homogeneous reaction model. According to the spectroscopy data, geochemical mechanism of kurnakovite was identified. The new geochemical hypothesis well explains the geochemical mechanism of kurnakovite minerals on the QTP.
语种	英语
引用统计
文献类型	期刊论文
条目标识符	http://ir.isl.ac.cn/handle/363002/4442
专题	青海盐湖研究所知识仓储中国科学院青海盐湖研究所
作者单位	1.Shaanxi Normal Univ, Coll Tourism & Environm, Xian 710062, Shaanxi, Peoples R China 2.Shaanxi Normal Univ, Coll Chem & Mat, Xian 710062, Peoples R China 3.Chinese Acad Sci, Xian Branch, Inst Salt Lakes, Xian 710043, Shaanxi, Peoples R China
推荐引用方式 GB/T 7714	Li, X.,Gao, S.,Liu, Z.,et al. Kurnakovite deposits on the Qinghai-Tibet Plateau (II): an investigation from chemical kinetics of chloropinnoite dissolution[J]. ENVIRONMENTAL EARTH SCIENCES,2013,70(3):1151-1158.
APA	Li, X.,Gao, S.,Liu, Z.,&Xia, S..(2013).Kurnakovite deposits on the Qinghai-Tibet Plateau (II): an investigation from chemical kinetics of chloropinnoite dissolution.ENVIRONMENTAL EARTH SCIENCES,70(3),1151-1158.
MLA	Li, X.,et al."Kurnakovite deposits on the Qinghai-Tibet Plateau (II): an investigation from chemical kinetics of chloropinnoite dissolution".ENVIRONMENTAL EARTH SCIENCES 70.3(2013):1151-1158.