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Fluoride in non-symbiotic coral associated with seawater carbonate

机译：非共生珊瑚中的氟化物与海水碳酸盐有关

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摘要

In order to elucidate factors controlling incorporation of fluoride from seawater into non-symbiotic coral skeletons, the mole ratio of fluorine to calcium (F/Ca) in Flabellum corals was determined. The samples were collected from water depths between 185 and 350 m in Tosa Bay, Japan. The coral F/Ca ratio increased from 6.01 to 8.04 mmol/mol with increasing water depth. The factor controlling F/Ca ratio is discussed based on the proposed coprecipitation process of F in coral aragonite as the ion-exchange reaction: CaCO_3 (s) + 2F~- (aq)=CaF_2 (s)+CO_3~(2-)(aq). Based on the above reaction, F/Ca in coral is represented as: F/Ca = 0.5 K_f'[F~-]~2/[CO_3~(2-)]. Using the carbonate equilibrium system in seawater, [CO_3~(2-)] in sampling depth was calculated. A strong correlation was observed between F/Ca in Flabellum corals and the calculated (CO_3~(2-)] in seawater, while salinity, temperature and pressure have little or negligible effects on F/Ca in coral aragonite. Our results indicate that F/Ca in non-symbiotic coral aragonite possibly serves as a proxy of [CO_3~(2-)] in seawater where the corals grew.
机译：为了阐明控制海水中氟化物掺入非共生珊瑚骨架中的因素，测定了费氏珊瑚中氟与钙的摩尔比（F / Ca）。样品是从日本土佐湾的185至350 m水深处采集的。随着水深的增加，珊瑚的F / Ca比值从6.01增加到8.04 mmol / mol。基于拟议的珊瑚文石中氟的共沉淀过程作为离子交换反应，讨论了控制氟/钙比的因素：CaCO_3（s）+ 2F〜-（aq）= CaF_2（s）+ CO_3〜（2-） （aq）。基于以上反应，珊瑚中的F / Ca为：F / Ca = 0.5 K_f'[F〜-]〜2 / [CO_3〜（2-）]。利用海水中的碳酸盐平衡体系，计算了采样深度[CO_3〜（2-）]。珊瑚label中的F / Ca与海水中的计算值（CO_3〜（2-）]之间存在很强的相关性，而盐度，温度和压力对文石中F / Ca的影响很小或可忽略不计。非共生珊瑚文石中的/ Ca可能充当珊瑚生长的海水中[CO_3〜（2-）]的替代物。

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  • 来源
    《Marine Chemistry》 |2013年第20期|45-50|共6页
  • 作者

    Kentaro Tanaka; Tomonori Ono; Yoshimi Fujioka; Shigeru Ohde;

  • 作者单位

    Faculty of Science, University of the Ryukyus, Nishihara, Okinawa 903-0213, Japan;

    Faculty of Science, University of the Ryukyus, Nishihara, Okinawa 903-0213, Japan;

    National Research Institute of Aquaculture, Fisheries Research Agency, Minami-ise, Mie 516-0193, Japan;

    Faculty of Science, University of the Ryukyus, Nishihara, Okinawa 903-0213, Japan;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    non-symbiotic coral; carbonate; fluoride; aragonite;

    机译：非共生珊瑚碳酸盐氟化物;文石;

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