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Modelling Hg mobility in podzols; role of soil components and environmental implications

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doi: 10.1016/j.envpol.2020.114040
Authors:Gómez-Armesto, Antia; Martinez-Cortizas, Antonio; Ferro-Vázquez, Cruz; Méndez-López, Melissa; Arias-Estévez, Manuel; Nóvoa-Muñoz, Juan Carlos
Author Affiliations:Primary:
Universidade de Vigo, Área de Edafoloxia e Quimica Agricola, Ourense, Spain
Other:
Universidade de Santiago de Compostela, Santiago, Spain
University of Algarve, Faro, Portugal
Volume Title:Environmental Pollution (1987)
Source:Environmental Pollution (1987), Vol.260. Publisher: Elsevier, Barking, United Kingdom. ISSN: 0269-7491
Publication Date:2020
Note:In English. 82 refs.; illus., incl. 3 tables
Summary:A high-resolution soil sampling has been applied to two forest podzols (ACB-I and ACB-II) from SW Europe in order to investigate the soil components and processes influencing the content, accumulation and vertical distribution of Hg. Total Hg contents (THg) were 28.0 and 23.6 µg kg-1 in A horizons of ACB-I and ACB-II, then they strongly decreased in the E horizons and peaked in the Bhs horizons of both soils (55.3 and 63.0 µg kg-1). THg decreased again in BwC horizons to 17.0 and 39.8 µg kg-1. The Bhs horizons accounted for 46 and 38% of the total Hg stored (ACB-I and ACB-II, respectively). Principal component analysis (PCA) and principal components regression (PCR), i.e. using the extracted components as predictors, allowed to distinguish the soil components that accounted for Hg accumulation in each horizon. The obtained model accurately predicted accumulated Hg (R2 = 0.845) through four principal components (PCs). In A horizons, Hg distribution was controlled by fresh soil organic matter (PC4), whereas in E horizons the negative values of all PCs were consistent with the absence of components able to retain Hg and the corresponding very low THg concentrations. Maximum THg contents in Bhs horizons coincided with the highest peaks of reactive Fe and Al compounds (PC1 and PC2) and secondary crystalline minerals (PC3) in both soils. The THg distribution in the deepest horizons (Bw and BwC) seemed to be influenced by other pedogenetic processes than those operating in the upper part of the profile (A, E and Bhs horizons). Our findings confirm the importance of soils in the global Hg cycling, as they exhibit significant Hg pools in horizons below the uppermost O and A horizons, preventing its mobilization to other environmental compartments.
Subjects:Forest soils; Horizons; Mercury; Metals; Podzolization; Podzols; Pollution; Principal components analysis; Regression analysis; Soil pollution; Soils; Statistical analysis; Europe; Galicia Spain; Iberian Peninsula; Southern Europe; Spain
Record ID:876559-94
Copyright Information:GeoRef, Copyright 2020 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands
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