Geochemical mapping of arsenic in surface waters and stream sediments of the Quadrilátero Ferrífero, Brazil

Q3 Earth and Planetary Sciences

Rem-Revista Escola De Minas Pub Date : 2015-03-01 DOI:10.1590/0370-44672015680077

R. V. F. Costa, M. Leite, F. Mendonça, H. Nalini

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引用次数: 17

Abstract

A regional study on the arsenic concentration in surface waters and stream sediments, with a density of one sample every 13 km2, was carried out for the first time in the Quadrilatero Ferrifero (Brazil). The region was divided into 3rd order catchment basins, in which 512 areas were sampled. The arsenic concentration was determined in waters and stream sediments after partial digestion with the aid of ICP-OES. The arsenic values found in surface waters ranged from 57.70 to 414 µg.L-1, while for stream sediments, arsenic concentrations ranged from 0.63 to 1691 mg.kg-1, and from the 512 sampling points, 135 (26%) had arsenic concentrations above the limit of detection, which was 0.63 mg.kg-1. It was also found that 106 3rd order catchment basins had values above the third quartile, (5.09 mg.kg-1). The results show that high concentrations of this element are strongly related to the presence of Nova Lima rocks that contain minerals rich in arsenic. However, the anthropogenic influence in such high concentrations cannot be ruled out, as the region has a history of over 300 years of gold mining.

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巴西Quadrilátero Ferrífero地表水和河流沉积物中砷的地球化学制图

对地表水和河流沉积物中的砷浓度进行了一项区域研究，密度为每13平方公里一个样本，首次在巴西的Quadrilatero Ferrifero进行。区域划分为三级集水区，共采样区512个。用ICP-OES法测定了部分消解后的水体和水系沉积物中砷的浓度。地表水的砷含量在57.70 ~ 414µg之间。L-1，而河流沉积物的砷浓度范围为0.63至1691毫克。512个采样点中，有135个(26%)的砷浓度超过检测限(0.63 mg.kg-1)。106个三级集水区在第三四分位数以上(5.09 mg.kg-1)。结果表明，这种元素的高浓度与含有富含砷的矿物的Nova Lima岩石的存在密切相关。然而，不能排除如此高浓度的人为影响，因为该地区有300多年的金矿开采历史。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Rem-Revista Escola De Minas 工程技术-工程：土木

自引率

0.00%

发文量

审稿时长

6-12 weeks

期刊介绍： REM – International Engineering Journal (antigua REM – Revista Escola de Minas) es la primera revista técnica de Sudamérica. Fue fundada en enero de 1936 por los estudiantes de la Escuela de Minas de Ouro Preto y desde entonces se ha especializado en la publicación de artículos en las áreas de la Ingeniería Civil, Geología, Metalurgia y Materiales y, Minería y Mecánica y Energía. Su objetivo es servir como un medio de publicación para los trabajos técnicos y científicos originales de investigadores nacionales y extranjeros en esas áreas. Contribuciones originales (artículos y cartas) son aceptadas. Artículos de revisión dependen de la invitación y/o análisis de los Editores. El envío de artículos para su publicación implica que el trabajo no ha sido publicado previamente, que no está siendo presentado para su publicación en otra revista y no se publicará en otro lugar, en la misma forma, sin el permiso, por escrito, de los Editores/Autores.