Francisco Javier Mora-Sánchez, Agustín Gómez-Álvarez, Martín Antonio Encinas-Romero, Jesús Leobardo Valenzuela-García, Martín Enrique Jara-Marini, Kareen Krizzan Encinas-Soto, Arturo Israel Villalba-Atondo, Guadalupe Dórame-Carreño
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引用次数: 0
摘要
这项研究的重点是 "El Lavadero "尾矿矿床,该矿床位于墨西哥西北部索诺拉州圣费利佩-德赫苏斯镇附近,属于采矿环境责任(MEL)。研究的目的是确定总砷(As)含量、其粒度分布和地球化学分布,以及其迁移能力和生物利用率。氧化和未氧化尾矿的结果显示,氢电位(pH 值)较低(2.4-5.7),总砷浓度较高(8235-36004 毫克/千克-1),主要分布在较细的颗粒(2 毫米)中。这些细颗粒可能会通过沥滤和水悬浮的方式迁移,从而对环境造成不利影响。相比之下,污水沉积物中的砷主要存在于较粗的部分(> 2 毫米)。尾矿中的砷有很大一部分(5-40%)存在于非残留地球化学组分(I + II + III)(1106-7675 毫克/千克-1)中,这表明砷具有迁移和生物利用的潜力。根据环境条件(氧化还原电位和 pH 值)的不同,砷可在非生物介质中重新溶解并表现出高流动性,最终可能对环境和人类健康造成影响。因此,修复 "El Lavadero "MEL 以防止进一步破坏环境至关重要。这项研究提供了有用的信息,有助于了解全球其他采矿环境责任中的一些现象,如砷的迁移和生物利用率及其对周围环境和生物群可能产生的影响,从而有助于在全球范围内研究受采矿活动污染的生态系统,特别是在干旱和半干旱气候地区。
Granulometric and Geochemical Distribution of Arsenic in a Mining Environmental Liability in a Semi-arid Area.
This study focuses on the "El Lavadero" tailings deposit, a mining environmental liability (MEL) located near the town of San Felipe de Jesús, Sonora, in northwest Mexico. The objective was to determine the total arsenic (As) content, its granulometric and geochemical distribution, as well as its mobilization capacity and bioavailability. The results from oxidized and unoxidized tailings showed low potential of hydrogen (pH) values (2.4-5.7) and high concentrations of total arsenic (8235-36,004 mg kg-1), predominantly in the finer granulometric fractions (< 0.05 mm). Arsenic also prevails in the finest fraction of agricultural soil (> 2 mm). These fine particles could present adverse environmental effects due to their potential to be transported by leaching and water suspension. In contrast, arsenic in the effluent sediments is primarily found in the coarser fraction (> 2 mm). A significant proportion of arsenic in the tailings (5-40%) was found in the non-residual geochemical fractions (I + II + III) (1106-7675 mg kg-1), indicating potential for mobilization and bioavailability. Depending on environmental conditions (redox potential and pH), arsenic can redissolve and exhibit high mobility in abiotic media, which may ultimately impact the environment and human health. Therefore, it is crucial to rehabilitate the "El Lavadero" MEL to prevent further environmental damage. This study provides useful information to understand some phenomena in other global mining environmental liabilities, such as mobilization and bioavailability of arsenic and its possible impact on the surrounding environment and biota, contributing to the worldwide research of ecosystems polluted by mining activity, especially in arid and semi-arid climates.
期刊介绍:
Archives of Environmental Contamination and Toxicology provides a place for the publication of timely, detailed, and definitive scientific studies pertaining to the source, transport, fate and / or effects of contaminants in the environment. The journal will consider submissions dealing with new analytical and toxicological techniques that advance our understanding of the source, transport, fate and / or effects of contaminants in the environment. AECT will now consider mini-reviews (where length including references is less than 5,000 words), which highlight case studies, a geographic topic of interest, or a timely subject of debate. AECT will also consider Special Issues on subjects of broad interest. The journal strongly encourages authors to ensure that their submission places a strong emphasis on ecosystem processes; submissions limited to technical aspects of such areas as toxicity testing for single chemicals, wastewater effluent characterization, human occupation exposure, or agricultural phytotoxicity are unlikely to be considered.