Quantification of boron incorporation into synthetic calcite under controlled pH and temperature conditions using a differential solubility technique

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	Quantification of boron incorporation into synthetic calcite under controlled pH and temperature conditions using a differential solubility technique
	He, Maoyong 1,2; Xiao, Yingkai 2; Jin, Zhangdong 1; Liu, Weiguo 1; Ma, Yunqi 2; Zhang, Yanling 2; Luo, Chongguang 2
	2013-01-28
发表期刊	CHEMICAL GEOLOGY
卷号	337 页码:67-74
关键词	Boron Synthetic Calcite Differential Solubility Incorporation
摘要	Due to the greater thermodynamic stability of CaCO3 relative to Li2CO3, synthetic CaCO3 was precipitated from artificial seawater by the release of CO32- from Li2CO3 and Ca2+ under different pH conditions. The pH of the solution was controlled by slowly bubbling high-purity NH3 or CO2 gas at 25 +/- 0.5 degrees C, assuming that the pH at which nucleation takes place is the same as the average pH of the solution. This method is referred to as the "differential solubility technique". The precipitated CaCO3 is dominated by crystalline calcite, as identified by scanning electron microscopy, X-ray diffraction, and Fourier transform infrared spectrometry. The boron concentrations in the precipitated calcite increased from 2930 mu g/g to 285.39 mu g/g when the artificial solution pH values increased from 7.40 +/- 0.03 to 8.80 +/- 0.03, indicating that pH has a significant effect on the incorporation of boron into synthetic calcite. Our results support the hypothesis that boron uptake in carbonates takes place predominantly by incorporation of the charged borate species B(OH)(4)(-). The partition coefficient K-D (defined as [B/Ca](CaCO3)/[B(OH)(4)(-)/HCO3-](seawater)) shows a general decrease with pH, and K-D x 1000 ranges from 2.13 to 1.27. (C) 2012 Elsevier B.V. All rights reserved.
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/363002/4457
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.Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian 710075, Peoples R China 2.Chinese Acad Sci, Qinghai Inst Salt Lakes, CAS Key Lab Salt Lake Resources & Chem, Xining 810008, Peoples R China
推荐引用方式 GB/T 7714	He, Maoyong,Xiao, Yingkai,Jin, Zhangdong,et al. Quantification of boron incorporation into synthetic calcite under controlled pH and temperature conditions using a differential solubility technique[J]. CHEMICAL GEOLOGY,2013,337:67-74.
APA	He, Maoyong.,Xiao, Yingkai.,Jin, Zhangdong.,Liu, Weiguo.,Ma, Yunqi.,...&Luo, Chongguang.(2013).Quantification of boron incorporation into synthetic calcite under controlled pH and temperature conditions using a differential solubility technique.CHEMICAL GEOLOGY,337,67-74.
MLA	He, Maoyong,et al."Quantification of boron incorporation into synthetic calcite under controlled pH and temperature conditions using a differential solubility technique".CHEMICAL GEOLOGY 337(2013):67-74.