Risk assessment and copper geochemistry of an orchard irrigated with mine water: a case study in the semiarid region of Brazil.

Environmental Geochemistry and Health
Daniel P OliveiraTiago O Ferreira

Abstract

This study aimed to evaluate mine water reuse, elucidating the potential problems related to trace metal biogeochemistry focusing on Cu dynamics in water, soil, and plants. Water samples were collected from a Cu mine and a reservoir used to store mine water. Additional samples were taken from soils from an uncultivated area and a banana orchard (irrigated with mine water for at least 10 years) and plant from the irrigated area. The following parameters were analyzed: pH, redox potential, dissolved ions in water samples (e.g., Ca2+, Mg2+, Na+, K+, Cu2+, SO 4 2- , and Cl-), bioavailable Cu and Cu solid-phase fractionation (in soils and reservoir sediments samples), as well as Cu content in banana plants. Mine water presents high dissolved Cu concentration (mean 2.3 ± 0.0 mg L-1), limiting its use for irrigation. Water storage at the reservoir increased water quality, reducing dissolved Cu concentration (mean 0.2 ± 0.0 mg L-1), due to adsorption/precipitation as carbonates (mean 131.8 ± 24.6 mg kg-1), organic matter (mean 1526.2 ± 4.7 mg kg-1) and sulfides (mean 158.4 ± 56.9 mg kg-1). Despite higher water quality at the reservoir, the use of mine water increased the amount of bioavailable Cu in soils, which was primarily associate...Continue Reading

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