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Rainfall also affects soil pH. Water passing through the soil leaches basic nutrients such as calcium and magnesium from the soil. They are replaced by acidic elements such as aluminum and iron. For this reason, soils formed under high rainfall conditions are more acidic than those formed under arid (dry) conditions.
The HFO-type iron minerals are stable under the normal oxidizing conditions found in shallow aquifers. This results in low dissolved arsenic concentrations in natural groundwater and relatively high sorption of arsenic onto the surface of the iron minerals.ote that the small difference in dissolved arsenic and iron concentrations do not appreciably change the reservoir of arsenic (3.03 mg/Kg) and iron (810 mg/Kg) in the solid phase.