Arsénico en aguas subterráneas de castilla y león y su impacto en suelos y cultivos de zanahoria

Resum

Groundwaters of two municipalities of Spain (Valladolid and Segovia) were studied during three years. Its results indicated that As concentrations in groundwater exceed WHO recommendation of 10 ï�­g/l. The high Ph and high bicarbonate concentration (average of 8.3 and 210 mg/l, respectively) favor the arsenate desorption from sediments to water. Temporal evolution indicated an arsenic decrease and an increase in nitrates; maybe these nitrates favored (chemical / microbiology) Fe (II) oxidation, generating FeOOH to absorb As. In carrots, the relationship of the bioaccumulation factor with soluble As in soil indicates an efficient As accumulation when the average of soluble As in soil is 44 μg/Kg, and/or a low efficient As accumulation when the average is 130 μg/Kg. This relationship indicates a high-affinity transport operating at low concentrations and a low-affinity transport operating at high concentrations, probably due to the double system of Pi/As transport.