{"title":"Ni2+、Zn2+和Co2+对绿锈向磁铁矿转变的影响","authors":"Orion Farr, Evert J. Elzinga, Nathan Yee","doi":"10.1186/s12932-022-00080-y","DOIUrl":null,"url":null,"abstract":"<div><p>In this study, we investigated Ni<sup>2+</sup>, Zn<sup>2+</sup>, and Co<sup>2+</sup> mineralogical incorporation and its effect on green rust transformation to magnetite. Mineral transformation experiments were conducted by heating green rust suspensions at 85 °C in the presence of Ni<sup>2+</sup>, Zn<sup>2+</sup>, or Co<sup>2+</sup> under strict anoxic conditions. Transmission electron microscopy and powder X-ray diffraction showed the conversion of hexagonal green rust platelets to fine grained cubic magnetite crystals. The addition of Ni<sup>2+</sup>, Zn<sup>2+</sup>, and Co<sup>2+</sup> resulted in faster rates of mineral transformation. The conversion of green rust to magnetite was concurrent to significant increases in metal uptake, demonstrating a strong affinity for metal sorption/co-precipitation by magnetite. Dissolution ratio curves showed that Ni<sup>2+</sup>, Zn<sup>2+</sup>, and Co<sup>2+</sup> cations were incorporated into the mineral structure during magnetite crystal growth. The results indicate that the transformation of green rust to magnetite is accelerated by metal impurities, and that magnetite is a highly effective scavenger of trace metals during mineral transformation. The implications for using diagenetic magnetite from green rust precursors as paleo-proxies of Precambrian ocean chemistry are discussed.</p><h3>Graphical Abstract</h3>\n <div><figure><div><div><picture><source><img></source></picture></div></div></figure></div>\n </div>","PeriodicalId":12694,"journal":{"name":"Geochemical Transactions","volume":"23 1","pages":""},"PeriodicalIF":0.9000,"publicationDate":"2022-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9798576/pdf/","citationCount":"4","resultStr":"{\"title\":\"Effect of Ni2+, Zn2+, and Co2+ on green rust transformation to magnetite\",\"authors\":\"Orion Farr, Evert J. Elzinga, Nathan Yee\",\"doi\":\"10.1186/s12932-022-00080-y\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>In this study, we investigated Ni<sup>2+</sup>, Zn<sup>2+</sup>, and Co<sup>2+</sup> mineralogical incorporation and its effect on green rust transformation to magnetite. Mineral transformation experiments were conducted by heating green rust suspensions at 85 °C in the presence of Ni<sup>2+</sup>, Zn<sup>2+</sup>, or Co<sup>2+</sup> under strict anoxic conditions. Transmission electron microscopy and powder X-ray diffraction showed the conversion of hexagonal green rust platelets to fine grained cubic magnetite crystals. The addition of Ni<sup>2+</sup>, Zn<sup>2+</sup>, and Co<sup>2+</sup> resulted in faster rates of mineral transformation. The conversion of green rust to magnetite was concurrent to significant increases in metal uptake, demonstrating a strong affinity for metal sorption/co-precipitation by magnetite. Dissolution ratio curves showed that Ni<sup>2+</sup>, Zn<sup>2+</sup>, and Co<sup>2+</sup> cations were incorporated into the mineral structure during magnetite crystal growth. The results indicate that the transformation of green rust to magnetite is accelerated by metal impurities, and that magnetite is a highly effective scavenger of trace metals during mineral transformation. The implications for using diagenetic magnetite from green rust precursors as paleo-proxies of Precambrian ocean chemistry are discussed.</p><h3>Graphical Abstract</h3>\\n <div><figure><div><div><picture><source><img></source></picture></div></div></figure></div>\\n </div>\",\"PeriodicalId\":12694,\"journal\":{\"name\":\"Geochemical Transactions\",\"volume\":\"23 1\",\"pages\":\"\"},\"PeriodicalIF\":0.9000,\"publicationDate\":\"2022-12-29\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9798576/pdf/\",\"citationCount\":\"4\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Geochemical Transactions\",\"FirstCategoryId\":\"89\",\"ListUrlMain\":\"https://link.springer.com/article/10.1186/s12932-022-00080-y\",\"RegionNum\":4,\"RegionCategory\":\"地球科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q4\",\"JCRName\":\"GEOCHEMISTRY & GEOPHYSICS\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Geochemical Transactions","FirstCategoryId":"89","ListUrlMain":"https://link.springer.com/article/10.1186/s12932-022-00080-y","RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"GEOCHEMISTRY & GEOPHYSICS","Score":null,"Total":0}
Effect of Ni2+, Zn2+, and Co2+ on green rust transformation to magnetite
In this study, we investigated Ni2+, Zn2+, and Co2+ mineralogical incorporation and its effect on green rust transformation to magnetite. Mineral transformation experiments were conducted by heating green rust suspensions at 85 °C in the presence of Ni2+, Zn2+, or Co2+ under strict anoxic conditions. Transmission electron microscopy and powder X-ray diffraction showed the conversion of hexagonal green rust platelets to fine grained cubic magnetite crystals. The addition of Ni2+, Zn2+, and Co2+ resulted in faster rates of mineral transformation. The conversion of green rust to magnetite was concurrent to significant increases in metal uptake, demonstrating a strong affinity for metal sorption/co-precipitation by magnetite. Dissolution ratio curves showed that Ni2+, Zn2+, and Co2+ cations were incorporated into the mineral structure during magnetite crystal growth. The results indicate that the transformation of green rust to magnetite is accelerated by metal impurities, and that magnetite is a highly effective scavenger of trace metals during mineral transformation. The implications for using diagenetic magnetite from green rust precursors as paleo-proxies of Precambrian ocean chemistry are discussed.
期刊介绍:
Geochemical Transactions publishes high-quality research in all areas of chemistry as it relates to materials and processes occurring in terrestrial and extraterrestrial systems.