Fractionation Behavior of Chromium Isotopes during the Sorption of Cr (VI) on Kaolin and its Implications for Using Black Shales as a Paleoredox Archive

Frank Anja B.; Klaebe Robert M.; Frei Robert

摘要

Abstract > Chromium stable isotope variations in marine black shales are increasingly used to constrain redox changes though time. However, how well black shale δ 53 Cr values represent ambient seawater δ 53 Cr values is difficult to assess as black shales contain both detrital and authigenic mineral phases, of which only authigenic phases are expected to mirror seawater, while detrital silicate phases are expected to show igneous δ 53 Cr values. In order to correct for detrital contamination, it is thus imperative to know whether detrital minerals are in fact characterized by igneous δ 53 Cr values. To investigate this further, three sets of Cr (VI) batch sorption experiments were conducted, reacting kaolin with (1) with a synthetic Cr (VI) solution, (2) with Cr (VI) doped river water, and (3) with Cr (VI) doped seawater. Further, sequential leaches were applied to reacted kaolin to evaluate how well sorbed Cr (VI) can be leached. The experiments revealed that Cr (VI) readily sorbs on kaolin, changing its Cr concentration and isotopic composition. In river water, kaolin sorbed up to 36?μg of Cr (VI) per gram of kaolin and recorded a negative offset in bulk δ 53 Cr of up to 0.26‰ relative to unreacted kaolin, while no sorption was observed in seawater. Our leaching experiments revealed that already a weak acid leach (0.5M HCl) readily mobilizes some of the sorbed Cr from kaolin, which when applied to black shales will likely contaminate leachates designed to release authigenic Cr. This has major implications for the application of Cr stable isotopes in black shales as marine paleoredox archives. </abstract> </span> <span class="z_kbtn z_kbtnclass hoverxs" style="display: none;">展开▼</span> </div> <div class="translation abstracttxt"> <span class="zhankaihshouqi fivelineshidden" id="abstract"> <span>机译：</span><Abstract Type =“Main”XML：Lang =“en”> <标题类型=“main”>抽象</ title> > 铬稳定的同位素在海洋黑色节宝中的变化越来越多地用于限制氧化还原而变化。但是，黑色页岩δ如何 53 </ sup> CR值代表环境海水δ 53 </ sup> 由于黑宝龙含有脱喉和捕获矿物阶段，CR值难以评估，其中仅预期对海水预期的作用阶段，而脱脂硅酸盐阶段预计将显示出火油δ 53 </ sup> CR值。为了纠正滴乳污染，因此必须知道滴乳矿物是否实际上是由火油δ表征的 53 </ sup> CR值。为了进一步研究这一点，进行了三组Cr（VI）分批吸附实验，使高岭土与（1）与合成Cr（VI）溶液，（2）用Cr（vi）掺杂的河水，和（3）反应Cr（vi）掺杂海水。此外，将序贯浸出施用以反应高岭林，评价机吸附的Cr（VI）可以浸出。实验表明，Cr（vi）易于在高岭土上吸附，改变其Cr浓度和同位素组合物。在河水中，高达高达36〜μgμg的高岭土的Cr（vi），并在散装δ中记录负偏移 53 </ sup> 相对于未反应的高岭土，Cr高达0.26‰，而海水中没有观察到过吸附。我们的浸出实验表明，已经弱酸浸出（0.5M HCl）易于调动来自高岭土的一些吸附的CR，这在施加到黑色的Shales时可能会污染设计用于释放Authigenic Cr的渗滤液。这对Cr稳定同位素在黑色Shales中的应用具有重要意义，因为海洋古罗里索档案。 </ p> </摘要> </span> <span class="z_kbtn z_kbtnclass hoverxs" style="display: none;">展开▼</span> </div> </div> <div class="record"> <h2 class="all_title" id="enpatent33" >著录项</h2> <ul> <li> <span class="lefttit">来源</span> <div style="width: 86%;vertical-align: text-top;display: inline-block;"> <a href='/journal-foreign-23285/'>《Geochemistry, geophysics, geosystems》</a> <b style="margin: 0 2px;">|</b><span>2019年第5期</span><b style="margin: 0 2px;">|</b><span>共13页</span> </div> </li> <li> <div class="author"> <span class="lefttit">作者</span> <p id="fAuthorthree" class="threelineshidden zhankaihshouqi"> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Frank Anja B.&option=202" target="_blank" rel="nofollow">Frank Anja B.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Klaebe Robert M.&option=202" target="_blank" rel="nofollow">Klaebe Robert M.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Frei Robert&option=202" target="_blank" rel="nofollow">Frei Robert;</a> </p> <span class="z_kbtnclass z_kbtnclassall hoverxs" id="zkzz" style="display: none;">展开▼</span> </div> </li> <li> <div style="display: flex;"> <span class="lefttit">作者单位</span> <div style="position: relative;margin-left: 3px;max-width: 639px;"> <div class="threelineshidden zhankaihshouqi" id="fOrgthree"> <p>Department of Geoscience and Natural Resource ManagementUniversity of CopenhagenCopenhagen Denmark;</p> <p>Department of Geoscience and Natural Resource ManagementUniversity of CopenhagenCopenhagen Denmark;</p> <p>Department of Geoscience and Natural Resource ManagementUniversity of CopenhagenCopenhagen Denmark;</p> </div> <span class="z_kbtnclass z_kbtnclassall hoverxs" id="zhdw" style="display: none;">展开▼</span> </div> </div> </li> <li > <span class="lefttit">收录信息</span> <span style="width: 86%;vertical-align: text-top;display: inline-block;"></span> </li> <li> <span class="lefttit">原文格式</span> <span>PDF</span> </li> <li> <span class="lefttit">正文语种</span> <span>eng</span> </li> <li> <span class="lefttit">中图分类</span> <span><a href="https://www.zhangqiaokeyan.com/clc/163.html" title="地球物理学">地球物理学;</a></span> </li> <li class="antistop"> <span class="lefttit">关键词</span> <p style="width: 86%;vertical-align: text-top;"> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=chromium isotopes&option=203" rel="nofollow">chromium isotopes;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=redox proxy&option=203" rel="nofollow">redox proxy;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=isotope fractionation&option=203" rel="nofollow">isotope fractionation;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=sorption&option=203" rel="nofollow">sorption;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=clays&option=203" rel="nofollow">clays;</a> </p> <div class="translation"> 机译：铬同位素;氧化还原代理;同位素分级;吸附;粘土; </div> </li> </ul> </div> </div> <div class="literature cardcommon"> <div class="similarity "> <h3 class="all_title" id="enpatent66">相似文献</h3> <div class="similaritytab clearfix"> <ul> <li class="active" >外文文献</li> <li >中文文献</li> <li >专利</li> </ul> </div> <div class="similarity_details"> <ul > <li> <div> <b>1. </b><a class="enjiyixqcontent" href="/journal-foreign-detail/0704023360731.html">Fractionation Behavior of Chromium Isotopes during the Sorption of Cr (VI) on Kaolin and its Implications for Using Black Shales as a Paleoredox Archive</a> <b>[J]</b> . <span> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Frank Anja B.&option=202" target="_blank" rel="nofollow" class="tuijian_auth tuijian_authcolor">Frank Anja B.,</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Klaebe Robert M.&option=202" target="_blank" rel="nofollow" class="tuijian_auth tuijian_authcolor">Klaebe Robert M.,</a> <a 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href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Zeng R.J.&option=202" target="_blank" rel="nofollow" class="tuijian_auth tuijian_authcolor">,Zeng R.J.</a> <span> <a href="/conference-cn-43332/" target="_blank" rel="nofollow" class="tuijian_authcolor"> . 中国矿物岩石地球化学学会第九次全国会员代表大会暨第16届学术年会 </a> <span> <span> . 2017</span> </span> </div> </li> <li> <div> <b>7. </b><a class="enjiyixqcontent" href="/academic-degree-domestic_mphd_thesis/020316290022.html">锰氧化物氧化三价铬过程中铬同位素的分馏</a> <b>[A] </b> <span> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=李莹&option=202" target="_blank" rel="nofollow" class="tuijian_auth tuijian_authcolor"> . 李莹</a> <span> . 2020</span> </span> </div> </li> </ul> <ul style="display: none;"> <li> <div> <b>1. </b><a class="enjiyixqcontent" href="/patent-detail/061203273229.html">微量硅酸岩样品铬同位素分离技术</a> <b>[P]</b> . <span> 中国专利： CN106404505B </span> <span> . 2019.04.05</span> </div> </li> <li> <div> <b>2. </b><a class="enjiyixqcontent" 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<span> . 2013-05-27</span> </div> <p class="zwjiyix translation" style="max-width: initial;height: auto;word-break: break-all;white-space: initial;text-overflow: initial;overflow: initial;"> <span>机译：黑色页岩矿石的吸附方法 </span> </p> </li> <li> <div> <b>5. </b><a class="enjiyixqcontent" href="/patent-detail/06130431371852.html">CHROMIUM-FREE COLORED OR CHROMIUM-FREE BLACK RUST PREVENTION TREATMENT LIQUID FOR FURTHER IMPROVING RUST PREVENTION FORCE OF GALVANIZED OR GALVANNEALED METAL SURFACE, AND CHROMIUM-FREE COLORED OR CHROMIUM-FREE BLACK RUST PREVENTION FILM TREATMENT METHOD</a> <b>[P]</b> . <span> 外国专利：  JP2009167516A </span> <span> . 2009-07-30</span> </div> <p class="zwjiyix translation" style="max-width: initial;height: auto;word-break: break-all;white-space: initial;text-overflow: initial;overflow: initial;"> <span>机译：进一步提高镀锌或镀锌金属表面的铁锈防护力的无铬彩色或无铬黑锈防锈处理液，以及无铬的彩色或无铬黑锈防锈膜处理方法 </span> </p> </li> </ul> </div> </div> </div> <div class="theme cardcommon" style="overflow: auto;display:none"> <h3 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