NDLI: Arsenate Displacement from Fly Ash in Amended Soils

Content Provider	Springer Nature Link
Author	Qafoku, Nikolla P. Kukier, Urszula Sumner, Malcolm E. Miller, William P. Radcliffe, David E.
Copyright Year	1999
Abstract	Arsenic (As) is the biggest environment contaminant in most of the soils where fly ash is applied. Usually, it is not mobile and strongly adsorbed on to soil particles. However, in gypsum and phosphorus amended soils As may be much more mobile. A study in repacked columns was conducted to determine whether or not As becomes mobile when Ca(H$_{2}$PO$_{4}$)$_{2}$and CaSO$_{4}$are used as leaching solutions, and to compare the competitive interactions between PO$_{4}$-AsO$_{4}$and SO$_{4}$-AsO$_{4}$. Arsenic concentration in leachate was found to be approximately ten times greater when Ca(H$_{2}$PO$_{4}$)$_{2}$was used to leach the columns as compared to CaSO$_{4}$. A maximum concentration of 800 μg As L$^{-1}$was found in the leachate in this case, which is much higher than the groundwater limit of 50 μg L$^{-1}$for drinking water established by the United States Environmental Protection Agency. In fly ash, the portion of arsenate non-specifically adsorbed is believed to be much lower than that of specifically adsorbed. Sulfate anions were able to displace only non-specifically adsorbed arsenate. In this case the concentration of As in leachate was found to be within acceptable limits. On the other hand, phosphate can compete with arsenate for all available adsorption sites, non-specific and specific. Phosphate displacement of both forms of arsenates increases As mobility in both control and fly ash treatments.
Starting Page	185
Ending Page	198
Page Count	14
File Format	PDF
ISSN	00496979
Journal	Water, Air, and Soil Pollution
Volume Number	114
Issue Number	1-2
e-ISSN	15732932
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	1999-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Hydrogeology Atmospheric Protection/Air Quality Control/Air Pollution
Content Type	Text
Resource Type	Article
Subject	Ecological Modeling Environmental Chemistry Pollution Environmental Engineering Water Science and Technology

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