Arsenic Fixation in Polluted Soils by Peat Applications
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AuthorAguilar Garrido, Antonio; Romero Freire, Ana; García Carmona, Minerva; Martín Peinado, Francisco José; Sierra Aragón, Manuel; Martínez Garzón, Francisco Javier
Soil remediationToxicity bioassaysHumic substancesCalcium carbonateIron oxidesPolyphenolic compounds
Aguilar-Garrido, A., Romero-Freire, A., García-Carmona, M., Martín Peinado, F. J., Sierra Aragón, M., & Martínez Garzón, F. J. (2020). Arsenic Fixation in Polluted Soils by Peat Applications. Minerals, 10(11), 968. [doi:10.3390/min10110968]
SponsorshipSpanish Ministry of Science, Innovation and Universities RTI 2018-094327-B-I00 FPU-18/02901
Soil arsenic (As) pollution is still a major concern due to its high toxicity and carcinogenicity, thus, the study of decontamination techniques, as the organic amendment applications, keeps upgrading. This research evaluates the potential remediation of peat in di erent As-polluted soils, by assessing the decrease of As solubility and its toxicity through bioassays. Obtained reduction in As solubility by peat addition was strongly related to the increase of humic substances, providing colloids that allow the complexation of As compounds. Calcareous soils have been the least e ective at bu ering As pollution, with higher As concentrations and worse biological response (lower soil respiration and inhibition of lettuce germination). Non-calcareous soils showed lower As concentrations due to the higher iron content, which promotes As fixation. Although in both cases, peat addition improves the biological response, it also showed negative e ects, hypothetically due to peat containing toxic polyphenolic compounds, which in the presence of carbonates appears to be concealed. Both peat dose tested (2% and 5%) decreased drastically As mobility; however, for calcareous soils, as there is no phytotoxic e ect, the 5% dose is the most recommended; while for non-calcareous soils the e cient peat dose for As decontamination could be lower.