Distribution and bioavailability of chromium in contaminated soils by tannery residues

Química Nova

Rocha, Julio Cesar¹  Oliveira, Alessandro Silva de¹  Santos, Ademir dos¹  Santos, Felipe André dos¹  Centro Universitário de Araraquara, Araraquara, Brasil¹  Mendonça, André Gustavo Ribeiro¹  Botero, Wander Gustavo¹  Oliveira, Luciana Camargo de¹  Instituto de Química de Araraquara, Araraquara, Brasil¹  Ribeiro, Maria Lúcia¹  Fundação Instituto de Terras do Estado de São Paulo, Araraquara, Brasil¹ 

关键词: environmental contamination;    tannery residues;    chromium.;   

DOI  :  10.1590/S0100-40422009000700002

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 摘 要 】

Samples of soil, water and sediment were collected and analyzed in order to evaluate chromium contamination due to deposition of tannery residues onto soils under different management regimes. The results showed that soils used for sugar cane cultivation were not adversely impacted. However, in the case of mango plantations, variable concentrations of chromium were measured in the soil profile, with 22.2% of values being higher than permitted legal limits, and 38.9% being at levels requiring remediation. Concentrations of bioavailable chromium were lower than the detection limit of the method (0.01 mg of chromium kg-1 of soil), indicating that all of the chromium present in the samples was either complexed or in an insoluble form. Chromium concentrations measured in samples of water and sediments were indicative of low mobility of the metal in soils. The main cause of differences found between soil samples obtained from different cultivations was the type of soil management.

【 授权许可】

Unknown