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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
Source PublicationCHINESE SCIENCE BULLETIN
Volume54Issue:17Pages:3090-3100
SubtypeArticle
AbstractExperiments 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.
KeywordBoron Incorporation Isotopic Fractionation Magnesium Hydroxide
WOS HeadingsScience & Technology
WOS KeywordCARBON-DIOXIDE CONCENTRATIONS ; SYNTHETIC CALCIUM-CARBONATE ; BORIC-ACID ADSORPTION ; SURFACE COMPLEXES ; OCEAN PH ; MAGNESIUM-OXIDE ; ION-EXCHANGE ; SEAWATER PH ; FORAMINIFERA ; MINERALS
Indexed BySCI
Language英语
WOS Research AreaScience & Technology - Other Topics
WOS SubjectMultidisciplinary Sciences
WOS IDWOS:000269529800026
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Document Type期刊论文
Identifierhttp://ir.isl.ac.cn/handle/363002/5907
Collection青海盐湖研究所知识仓储
Affiliation1.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
Recommended Citation
GB/T 7714
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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