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Boron isotopic fractionation during incorporation of boron into Mg(OH)(2)
Xiao Jun1,3; Xiao YingKai1,2; Liu CongQiang1; Zhao ZhiQi1; He MaoYong2,3; Liang ChongShan1
2009-09-01
发表期刊CHINESE SCIENCE BULLETIN
卷号54期号:17页码:3090-3100
文章类型Article
摘要Experiments of boron incorporated into Mg(OH)(2) from magnesium-free synthetic seawater were carried out at various pH values, in order to investigate the adsorption species and the variation of isotopic fractionation of boron on Mg(OH)(2). The results showed that the incorporation of boron into Mg(OH)(2) was very rapid and reached the equilibrium after 4 h. The [B](s) and the partition coefficient K (d) between Mg(OH)(2) and final solution decreased with the increasing pH. The maximum values of [B](s) and K (d) were much higher than that of boron adsorbed on metal oxide or clay minerals, indicating that the incorporation capability of boron into Mg(OH)(2) was very strong. When the adsorption reached the equilibrium, the delta B-11(fsw) was lower than delta B-11(isw). The boron isotopic fractionation alpha (s-fsw) was between 1.0186 and 1.0220 with an average of 1.0203. All these indicated that B-11 incorporated into Mg(OH)(2) preferentially due to B(OH)(3) incorporation into Mg(OH)(2) preferentially. The deposition reaction of B(OH)(3) with Mg(OH)(2) was the direct reason for B(OH)(3) incorporation into Mg(OH)(2). During the boron incorporation into Mg(OH)(2), the isotopic fractionation characteristic of boron was decided by the simultaneous existence of adsorption of boron on Mg(OH)(2) and the deposition reaction of H3BO3 with Mg(OH)(2). Different from the fact that only B(OH) (4) (-) species incorporated into bio-carbonate, B(OH)(3) and B(OH)(4) incorporated into Mg(OH)(2) simultaneously, and B(OH)(3) incorporated into it preferentially. The lower pH is, the more incorporated fraction of B(OH)(3) will be. Mg(OH)(2) exists widely in madrepore, which influences the quantitative correspondence of the boron isotopic composition delta B-11(carb) of corals on the pH of the seawater badly, and brings serious uncertainty to the delta B-11(carb) as the indicator of the ancient seawater pH.
关键词Boron Incorporation Isotopic Fractionation Magnesium Hydroxide
WOS标题词Science & Technology
关键词[WOS]CARBON-DIOXIDE CONCENTRATIONS ; SYNTHETIC CALCIUM-CARBONATE ; BORIC-ACID ADSORPTION ; SURFACE COMPLEXES ; OCEAN PH ; MAGNESIUM-OXIDE ; ION-EXCHANGE ; SEAWATER PH ; FORAMINIFERA ; MINERALS
收录类别SCI
语种英语
WOS研究方向Science & Technology - Other Topics
WOS类目Multidisciplinary Sciences
WOS记录号WOS:000269529800026
引用统计
文献类型期刊论文
条目标识符http://ir.isl.ac.cn/handle/363002/5907
专题青海盐湖研究所知识仓储
作者单位1.Chinese Acad Sci, Inst Geochem, State Key Lab Environm Geochem, Guiyang 550002, Peoples R China
2.Chinese Acad Sci, Qinghai Inst Salt Lakes, CAS Key Lab Salt Lake Resources & Chem, Xining 810008, Peoples R China
3.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
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Xiao Jun,Xiao YingKai,Liu CongQiang,et al. Boron isotopic fractionation during incorporation of boron into Mg(OH)(2)[J]. CHINESE SCIENCE BULLETIN,2009,54(17):3090-3100.
APA Xiao Jun,Xiao YingKai,Liu CongQiang,Zhao ZhiQi,He MaoYong,&Liang ChongShan.(2009).Boron isotopic fractionation during incorporation of boron into Mg(OH)(2).CHINESE SCIENCE BULLETIN,54(17),3090-3100.
MLA Xiao Jun,et al."Boron isotopic fractionation during incorporation of boron into Mg(OH)(2)".CHINESE SCIENCE BULLETIN 54.17(2009):3090-3100.
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