Addition of iron oxide based adsorbents to arsenic contaminated soils has been proposed as a
mean to reduce the mobility of arsenic in the soil. However, the conditions in the soil such as
pH value, the presence of phosphate after addition of fertilizer to the soil or the presence of
Zn (II) as a co-contaminant may affect the adsorption of arsenate on the iron oxide and may
therefore have implications for the mobility of arsenic in the remediated soil