Authors: Marcio Osvaldo Lima Magalhães Nelson Moura Brasil do Amaral Sobrinho Everaldo Zonta Bruna Farias Simões Amanda Guimarães de Mattos Alfredo TolónBecerra Xavier Bolívar LastraBravo
Publish Date: 2014/01/12
Volume: 92, Issue: 3, Pages: 311-316
Abstract
Few studies have focused on the release of toxic elements from oil well drill cuttings and their effect on soil The present study evaluated these effects using rice growth as the endpoint Drill cuttings were collected from a Brazilian well and added in doses of 300 3000 and 6000 mg kg−1 soil which was maintained at oxidized or reduced conditions When the redox potential reached approximately −250 mV barium concentrations were determined by geochemical fractionation Overall doses of 300 and 3000 mg kg−1 promoted plant development while a dose of 6000 mg kg−1 inhibited it due to the associated increase in electrical conductivity and exchangeable sodium concentration In addition the lower redox potential promoted solubilization of barite from the drill cuttings which increased barium absorption by plants and translocation to grain posing a risk to human health
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