Solo contaminado com cádmio: extratibilidade do metal e cinética química de degradação da matéria orgânica de torta de filtro

• Main Authors: Lucia Pittol Firme, Felipe Carlos Alvarez Villanueva, Antonio Arnaldo Rodella
• Format: Article
• Language: English
• Published: Sociedade Brasileira de Química 2014-07-01
• Series: Química Nova
• Subjects: organic matter degradation; chemical kinetics; DTPA-extractable Cd
• Online Access: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422014000600006&lng=en&tlng=en

The chemical kinetics of sugarcane filter cake (FC) organic matter degradation at rates (0, 40, 80, and 120 t ha-1) in non-contaminated and different degrees of cadmium-contaminated Oxisol (0.19, 28, 56, 112 and 200 mg Cd kg-1) and DTPA-extractable Cd was studied. FC degradation was determined by quantifying CO2 emitted from soil samples during 72 days of incubation. DTPA-extractable Cd was performed after the incubation period. FC degradation was described by a two-stage equation of chemical kinetics. FC degradation rates were between 15 and 33%. Total CO2 emitted from FC declined with increasing degree in Cd-contamination and the DTPA-extractable Cd declined with FC rates.