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

Química Nova

Lucia Pittol Firme¹  Felipe Carlos Alvarez Villanueva¹  Antonio Arnaldo Rodella¹ 

[1] Universidade de São Paulo;

关键词: organic matter degradation;    chemical kinetics;    DTPA-extractable Cd;   

DOI  :  10.5935/0100-4042.20140173

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown