Simultaneous Determination of I/Ca and Other Elemental Ratios in Foraminifera: Comparing Results From Acidic and Basic Solutions
Simultaneous Determination of I/Ca and Other Elemental Ratios in Foraminifera: Comparing Results From Acidic and Basic Solutions
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同时测定有孔虫中的 I/Ca 和其他元素比率：比较酸性和碱性溶液的结果
DOI：
10.1029/2022gc010660
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Rosenthal, Yair
中科院分区：
文献类型：
--
作者：
Zhou, Xiaoli;Hess, Anya V.;Bu, Kaixuan;Sagawa, Takuya;Rosenthal, Yair
碳酸盐中的碘钙比（I/Ca）在过去被广泛用于指示海洋氧合水平。考虑到碘的挥发性，在先前的研究中已在碱性溶液中测量了I/Ca。然而，这限制了I/Ca与其他元素/Ca（El/Ca）代用品同时在同一有孔虫中的应用，因为其他El/Ca数据优选在酸性溶液中分析。本研究评估了用其他El/Ca测量的酸性溶液中I/Ca测量的可靠性以及不同样品预处理对测量的有孔虫I/Ca的影响。我们的结果表明，当样品在制备后数小时内测量时，最终溶液的pH值对碳酸盐参比物质JCp-1和多元素标准溶液的I/Ca测量值的影响不显著，这与碘挥发的缓慢动力学一致。然而，我们发现，低pH值可能会降低测量的I/Ca有孔虫测试在一些样品中。我们的实验还表明，还原性清洁的可分辨的效果，产生较低的有孔虫I/Ca相比，没有还原性清洁。用于溶解有孔虫壳的HNO 3浓度具有可忽略的影响。尽管溶液的pH值以及清洁和溶解方法不同，但我们的岩心顶部还原性I/Ca数据能够区分上层海洋中氧合良好的沃茨和缺氧的海水，并且在校正清洁效果后，我们的数据与已发表的研究结果基本一致，这些研究分析了没有还原性清洁和碱性溶液中的I/Ca。这项研究表明，在几个小时内的样品溶解的测量I/Ca产生可靠的钙离子I/Ca数据，同时也允许收购其他El/Ca值的古海洋学研究。
The iodine to calcium ratio in carbonate (I/Ca) has been widely used to indicate ocean oxygenation level in the past. Given the volatility of iodine, I/Ca has been measured in alkaline solutions in previous studies. However, this limits the application of I/Ca with other element/Ca (El/Ca) proxies at the same time and in the same foraminifera because other El/Ca data are preferably analyzed in acidic solutions. This study assesses the reliability of I/Ca measurements in acidic solutions measured with other El/Ca as well as the effects of different sample pre‐treatments on measured foraminiferal I/Ca. Our results show that when samples are measured within hours of prepaparation, the pH of the final solution has an insignificant effect on I/Ca measurements of a carbonate reference material JCp‐1 and a multi‐element standard solution, consistent with the slow kinetics of iodine volatilization. We find, however, that low pH possibly reduces the measured I/Ca in foraminiferal tests in some samples. Our experiments also suggest a resolvable effect of reductive cleaning, yielding lower foraminiferal I/Ca compared to without reductive cleaning. The HNO3concentration used to dissolve foraminiferal shells has a negligible effect. Despite the different solution pHs and cleaning and dissolving methods, our core top planktic I/Ca data are able to differentiate well‐oxygenated from oxygen‐depleted waters in the upper ocean, and after correcting for cleaning effect, our data are generally consistent with the published studies that analyzed I/Ca without reductive cleaning and in basic solutions. This study shows that measurements of I/Ca within hours of sample dissolutions yield reliable planktic I/Ca data, while also allowing the acquisition of other El/Ca values for paleoceanographic studies.
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影响因子：
5.8
作者：
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影响因子：
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作者：
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