在巴西niquel印度超基性岩石上开发的Ferralsols金属的现场可用性和流动性

IF 1.3 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY
J. Garnier, C. Quantin, S. Raous, E. Guimarães, T. Becquer
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引用次数: 2

摘要

超镁铁质(UM)岩石被定义为含有90%以上镁铁质矿物的火成岩。来自超镁质岩石的土壤通常缺乏营养,并伴有高浓度的潜在植物毒性微量元素(Ni, Cr, Co, Mn)。因此,为了评估niquel印度(巴西)超镁铁复合体中营养物质和金属的动态,在具有高Cr(VI)有效性的土壤中对土壤溶液进行了采样。分析了地表水中金属的含量,探讨了金属的淋溶和迁移。土壤溶液具有养分含量低、Ca:Mg失衡大、Ni和Cr浓度高的特点。铬以其有毒的溶解形式(Cr(VI))存在于土壤和地表溶液中。金属浓度往往超过生物群的有毒限度,因此能够影响土壤功能。表层土壤中Ni的行为主要受有机质控制,而Cr更可能通过阴离子交换从铁氧化物中释放出来。这一结果与一项伴随研究中使用同位素交换动力学评估的Cr(VI)不稳定性一致。在这些蛇形热带土壤中,高浸出的氧化铁层分别在土壤剖面的深层和表层土壤中对活性Cr(VI)和Ni的固存和扩散浸出发挥了重要作用。在流域尺度上,表面解决方案的结果表明,金属可能会出口到周围不适应这些金属的生态系统。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Field availability and mobility of metals in Ferralsols developed on ultramafic rock of Niquelândia, Brazil
Ultramafic (UM) rocks are defined as igneous rocks that contain more than 90% of mafic minerals. Soils derived from ultramafic rock are generally nutrient-deficient and have concomitant high concentrations of potentially phytotoxic trace elements (Ni, Cr, Co, Mn). Consequently, to assess the dynamics of nutrients and metals in the ultramafic complex of Niquelândia (Brazil), soil solutions have been sampled in soils characterized by high Cr(VI) availability. The metal contents in surficial water have also been analyzed to investigate the metals’ leaching and mobility. Soil solutions featured low nutrient contents, a large Ca:Mg imbalance, and high Ni and Cr concentrations. Chromium was present in its toxic dissolved form (Cr(VI)) in the soil and surficial solutions. Metals concentrations were often above the toxic limit for biota and were therefore able to affect soil functioning. Ni behavior in the topsoil appeared to be primarily controlled by organic matter, while Cr was more likely to be released from Fe-oxides by anionic exchange. This result agreed with the Cr(VI) lability assessed using isotopic exchange kinetics in a companion study. In these serpentinic tropical soils, the highly leached Fe-oxide horizons appear to play a large role in the sequestration and diffuse leaching of labile Cr(VI) and Ni, respectively, in the deeper part of soil profiles and the topsoil. At the catchment scale, surficial solutions results suggest that metals may be exported to surrounding ecosystems that are not adapted to these metals.
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来源期刊
Brazilian Journal of Geology
Brazilian Journal of Geology GEOSCIENCES, MULTIDISCIPLINARY-
CiteScore
3.20
自引率
7.10%
发文量
12
审稿时长
11 weeks
期刊介绍: The Brazilian Journal of Geology (BJG) is a quarterly journal published by the Brazilian Geological Society with an electronic open access version that provides an in-ternacional medium for the publication of original scientific work of broad interest concerned with all aspects of the earth sciences in Brazil, South America, and Antarctica, in-cluding oceanic regions adjacent to these regions. The BJG publishes papers with a regional appeal and more than local significance in the fields of mineralogy, petrology, geochemistry, paleontology, sedimentology, stratigraphy, structural geology, tectonics, neotectonics, geophysics applied to geology, volcanology, metallogeny and mineral deposits, marine geology, glaciology, paleoclimatology, geochronology, biostratigraphy, engineering geology, hydrogeology, geological hazards and remote sensing, providing a niche for interdisciplinary work on regional geology and Earth history. The BJG publishes articles (including review articles), rapid communications, articles with accelerated review processes, editorials, and discussions (brief, objective and concise comments on recent papers published in BJG with replies by authors). Manuscripts must be written in English. Companion papers will not be accepted.
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