Abstract

Batch-type experiments were used to study competitive As(V) and P sorption on various soils and sorbent materials. The materials assayed were a forest soil, a vineyard soil, pyritic material, granitic material, coarsely and finely ground mussel shell, calcinated mussel shell ash, pine sawdust and slate processing fines. Competition between As(V) and P was pronounced in the case of both soils, granitic material, slate fines, both shells and pine sawdust, showing more affinity for P. Contrary, the pyritic material and mussel shell ash showed high and similar affinity for As(V) and P. These results could be useful to make a correct use of the soils and materials assayed when focusing on As and P removal in solid or liquid media, in circumstances where both pollutants may compete for sorption sites.

Highlights

  • Arsenic pollution is a matter of public health concern, mainly in connection with its presence in drinking water

  • In this work we study As(V) and P competitive sorption on different soils and materials, concretely a forest soil, a vineyard soil, a pyritic material, a granitic material, coarse and fine mussel shell, calcinated mussel shell ash, pine sawdust, slate processing fines

  • The results indicate that sorption was higher for P than for As in the case of a group of materials: both soils, granitic material, fine and coarse mussel shell, sawdust and slate fines

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Summary

Introduction

Arsenic pollution is a matter of public health concern, mainly in connection with its presence in drinking water. Soils can suffer the simultaneous application of P (i.e., by fertilization) and As (i.e., by spreading of pesticides), causing potential competition for adsorption sites, which could be very relevant [6,7,8]. In this regard, enhanced risks of soil and water pollution could take place if phosphate competition inhibits arsenic sorption and/or causes arsenic release from previously occupied sorption sites. Recent works have evaluated different sorbent materials as regards the influence of the simultaneous presence of two or more anions -including arsenate and phosphate- on its respective sorption results [17,18,19,20]

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