Cd2+, Cu2+, and Pb2+ sorption, desorption and migration in Fluvisols
- Arenas-Lago, Daniel
- Rodríguez-Seijo, Andrés
- Cerqueira Cancelo, Beatriz
- Andrade Couce, María Luisa
- Alonso Vega, Flora
ISSN: 2253-6574
Ano de publicación: 2015
Volume: 5
Número: 3
Páxinas: 276-295
Tipo: Artigo
Outras publicacións en: Spanish Journal of Soil Science: SJSS
Resumo
O objetivo deste trabalho foi avaliar e comparar a capacidade de sorção e dessorção, individual e bimetálica e a histerese de Cd2+, Cu2+ y Pb2+ em dois diferentes tipos de fluvissolos. Avaliou-se a migração dos catiões através dos perfiis bem como a influência nas propriedades do solo da fixação mono e bimetálica Cd2+, Cu2+e Pb2+, a histerese e a mobilidade. Avaliou-se a irreversibilidade de sorção e a migração através dos perfis dos catiões estudados, por meio de índices de histerese e de migração, calculados a partir dos valores de capacidade de retenção (Kr) propostos e validados em trabalho anterior. Os resultados mostraram que as capacidades de sorção e retenção dos horizontes A foram maiores que as dos C, e que as capacidades de sorção e retenção individuais foram maiores que as capacidades competitivas. Os solos mostraram maiores capacidades de sorção e retenção de Pb2+, seguido de Cu2+ e Cd2+. Os óxidos de Mn, matéria orgânica, e consequentemente, a CTC são os componentes e propriedades com maior influência na sorção e retenção individual e competitiva de Pb2+. O Cd2+ não afeta a sorção e retenção de Pb2+ ou Cu2+. O teor de matéria orgânica somente se correlacionou com a histerese da sorção de Pb2+ devido à alta capacidade de fixação de Pb2+ deste componente e à sua menor capacidade de reter Cu2+ e Cd2+. Os Fluvissolos Tidálicos retiveram somente 0,4 e 0,2% do Cd2+ adicionado em competição com o Cu2+ ou o Pb2+, respectivamente. Entretanto, mais de 60% do Pb2+ e mais de 47% do Cu2+ adicionados foram retidos. O Pb2+ retido em competição com o Cu2+ foi de 98,2% do adicionado aos Fluvissolos Tidálicos e 47% nos Fluvissolos Úmbricos, enquanto que o Cu2+ retido foi de 93,8 e 29,9%, respectivamente, do adicionado. Esta retenção e a mobilidade de Cd2+ mostra a possibilidade de transferência de metais pesadospara as água subsuperficiais e através destas, de contaminação, ou mesmo de que estes metais entrem na cadeia alimentar.
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