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Quantification of boron incorporation into synthetic calcite under controlled pH and temperature conditions using a differential solubility technique
He, MY (He, Maoyong)[ 1,2 ]; Xiao, YK (Xiao, Yingkai)[ 2 ]; Jin, ZD (Jin, Zhangdong)[ 1 ]; Liu, WG (Liu, Weiguo)[ 1 ]; Ma, YQ (Ma, Yunqi)[ 2 ]; Zhang, YL (Zhang, Yanling)[ 2 ]; Luo, CG (Luo, Chongguang)[ 2 ]
2013-01-28
Source PublicationCHEMICAL GEOLOGY
Volume337-338Pages:67-74
Subtype期刊论文
Abstract

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.

KeywordBoron Synthetic Calcite Differential Solubility Incorporation
DOI10.1016/j.chemgeo.2012.11.013
Indexed BySCI ; EI
Language英语
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Cited Times:17[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ieecas.cn/handle/361006/9918
Collection加速器质谱中心
Corresponding AuthorHe, MY (He, Maoyong)[ 1,2 ]; Xiao, YK (Xiao, Yingkai)[ 2 ]
Affiliation1.State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710075, China;
2.CAS Key Laboratory of Salt Lake Resources and Chemistry, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, China
Recommended Citation
GB/T 7714
He, MY ,Xiao, YK ,Jin, ZD ,et al. Quantification of boron incorporation into synthetic calcite under controlled pH and temperature conditions using a differential solubility technique[J]. CHEMICAL GEOLOGY,2013,337-338:67-74.
APA He, MY .,Xiao, YK .,Jin, ZD .,Liu, WG .,Ma, YQ .,...&Luo, CG .(2013).Quantification of boron incorporation into synthetic calcite under controlled pH and temperature conditions using a differential solubility technique.CHEMICAL GEOLOGY,337-338,67-74.
MLA He, MY ,et al."Quantification of boron incorporation into synthetic calcite under controlled pH and temperature conditions using a differential solubility technique".CHEMICAL GEOLOGY 337-338(2013):67-74.
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