TY - CHAP
T1 - Role of natural red earth in arsenic removal in drinking water - comparison with synthetic gibbsite and goethite
AU - Vithanage, M.
AU - Chandrajith, R.
AU - Weerasooriya, R.
PY - 2007
Y1 - 2007
N2 - Arsenic contamination in drinking water has been recorded as a problem of global concern. This study aims to investigate As retention on goethite and gibbsite as a function of pH with similar site densities of >FeOH and >AlOH of natural red earth (NRE), to ensure that these two will make out the same adsorption as >Fe and >Al sites of NRE. 0.385 μmol/l of arsenite and arsenate were spiked separately to solid suspensions, with adjusted pH from 4.0 to 9.0, and equilibrated for 24 h. Final pH were recorded and supernatant was analysed for As after centrifugation and filtration. Data were modelled using a generalized diffuse layer model. Arsenite adsorption was low for gibbsite (50%) than goethite (<95%) and showed a parabolic behaviour, which was not apparent in NRE. Arsenate adsorption was high (>90%) for both solids and showed no pH dependency. Model calculations were fitted well and the model validation was successful with a variation of >AlOH and >FeOH (10-fold) site concentration on NRE.
AB - Arsenic contamination in drinking water has been recorded as a problem of global concern. This study aims to investigate As retention on goethite and gibbsite as a function of pH with similar site densities of >FeOH and >AlOH of natural red earth (NRE), to ensure that these two will make out the same adsorption as >Fe and >Al sites of NRE. 0.385 μmol/l of arsenite and arsenate were spiked separately to solid suspensions, with adjusted pH from 4.0 to 9.0, and equilibrated for 24 h. Final pH were recorded and supernatant was analysed for As after centrifugation and filtration. Data were modelled using a generalized diffuse layer model. Arsenite adsorption was low for gibbsite (50%) than goethite (<95%) and showed a parabolic behaviour, which was not apparent in NRE. Arsenate adsorption was high (>90%) for both solids and showed no pH dependency. Model calculations were fitted well and the model validation was successful with a variation of >AlOH and >FeOH (10-fold) site concentration on NRE.
UR - http://www.scopus.com/inward/record.url?scp=44349138108&partnerID=8YFLogxK
U2 - 10.1016/S1875-1121(06)09022-5
DO - 10.1016/S1875-1121(06)09022-5
M3 - Chapter in book
AN - SCOPUS:44349138108
SN - 9780444518200
T3 - Trace Metals and other Contaminants in the Environment
SP - 587
EP - 601
BT - Arsenic in soil and groundwater environment
A2 - Bhattacharya, Prosun
A2 - Mukherjee, Arun
A2 - Bundschuh, Joche
A2 - Zevenhoven, Ron
A2 - Loeppert, Richard
PB - Elsevier
ER -