Adsorption and transport of arsenate in carbonate-rich soils: coupled effects of nonlinear and rate-limited sorption

Chemosphere
Irfan Yolcubal, Nihat Hakan Akyol

Abstract

The transport and fate of arsenate in carbonate-rich soil under alkaline conditions was investigated with multiple approaches combining batch, sequential extraction and column experiments as well as transport modeling studies. Batch experiments indicated that sorption isotherm was nonlinear over a wide range of concentration (0.1-200 mg L(-1)) examined. As(V) adsorption to the calcareous soil was initially fast but then continued at a slower rate, indicating the potential effect of rate-limited sorption on transport. Column experiments illustrated that transport of As(V) was significantly retarded compared to a non-reactive tracer. The degree of retardation decreased with increasing As(V) concentration. As(V) breakthrough curves exhibited nonideal transport behavior due to the coupled effects of nonlinear and rate-limited sorption on arsenate transport, which is consistent with the results of modeling studies. The contribution of nonlinear sorption to the arsenate retardation was negligible at low concentration but increased with increasing As(V) concentration. Sequential extraction results showed that nonspecifically sorbed (easily exchangeable, outer sphere complexes) fraction of arsenate is dominant with respect to the inner...Continue Reading

References

Sep 22, 2005·Environmental Science & Technology·Hua Zhang, H M Selim
May 1, 1987·Environmental Science & Technology·J M Brannon, W H Patrick

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Citations

Apr 24, 2013·Environmental Science and Pollution Research International·Natalia Seco-ReigosaAvelino Núñez-Delgado
Jun 23, 2010·Journal of Hazardous Materials·Kai Ying ChiangMing Kuang Wang
Apr 19, 2011·Journal of Hazardous Materials·Srilert ChotpantaratKhemarath Osathaphan
May 15, 2018·Environmental Science and Pollution Research International·Aurora Romar-GasallaAvelino Núñez-Delgado
Dec 19, 2019·Environmental Monitoring and Assessment·Mert GuneyRecep Ugur Acar
Jul 30, 2017·International Journal of Environmental Research and Public Health·Ana Quintáns-FondoAvelino Núñez-Delgado
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Jan 18, 2018·Journal of Toxicology and Environmental Health. Part a·Clay M NelsonKaren D Bradham
Jul 17, 2021·Journal of Environmental Management·Kien Thanh NguyenDonghao Li
Nov 25, 2021·Environmental Science and Pollution Research International·Narayanan NatarajanGovindarajan Suresh Kumar

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