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Sorption kinetics of arsenic on laterite soil in aqueous medium.

Journal of environmental science and health. Part A, Toxic/hazardous substances & environmental engineering (2007-06-15)
Sanjoy K Maji, Anjali Pal, Tarasankar Pal, Asok Adak
ABSTRACT

The efficiency of a locally available laterite soil in removing both arsenite and arsenate from aqueous medium by adsorption was evaluated. It was observed that in batch experiment conducted at 0.5 mg/L initial concentration of arsenic, laterite soil could remove up to 98% of arsenite and 95% of arsenate under optimized conditions. The kinetic profiles under various conditions were developed. Both arsenite and arsenate removal followed pseudo--second order reaction kinetic model. Pore and film diffusion coefficients were determined from the half-time equation and film diffusion appeared to be the rate-limiting. This was further supported by multiple interruption tests.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Silver diethyldithiocarbamate
Sigma-Aldrich
Silver diethyldithiocarbamate, ACS reagent, 99%
Sigma-Aldrich
Silver diethyldithiocarbamate, ACS reagent, for the determination of As, ≥99.0%