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Phosphorus transport in different soil types and the contribution of control factors to phosphorus retardation.
- Source :
-
Chemosphere . Aug2021, Vol. 276, pN.PAG-N.PAG. 1p. - Publication Year :
- 2021
-
Abstract
- Iron (Fe) minerals, organic matter (OM), and pH can effectively regulate phosphorus (P) transport in the soil. However, their respective contributions in this regard are still unclear. In this study, P transport in soil columns was investigated by monitoring breakthrough curves and transport model fitting, and the contributions of Fe and total organic carbon (TOC) concentrations, as well as pH to P retention, were determined using multiple linear regression (MLR). The results showed that the rate of P transport in Fe-rich laterite soil was significantly lower (retardation factor R = 458.5) than that in the other soil types (R = 108.4–247.6). Additionally, it was observed that OM formed rate-limited adsorption sites, causing the rapid release of labile P, and owing to P release and readsorption. Even though more significant P releases were observed, chernozem soil had an obvious inhibiting effect on P transport owing to its relatively high Fe content, and the high P-Fe increment (48.9–90.4%) indicated the essential role of Fe minerals in P immobilization. Further, P was readily transported in natural or artificially modified fluvo-aquic soils with high calcium concentrations, and it was also observed that the convection–dispersion equation (CDE) and Thomas models were suitable for describing P retardation and adsorption, respectively. Furthermore, the contribution weights of Fe and TOC concentrations as well as pH to P retardation, based on MLR calculations, were approximately 1.0, −0.3, and −0.2, respectively. Our findings can support the control of eutrophication pollution caused by P leaching. [Display omitted] • Phosphorus transport in Fe-rich laterite soil was significantly low. • Mutually verifiable results were derived from the CDE and Thomas models. • Using MLR, the contributions of Fe and TOC concentrations as well as pH to P retardation were determined. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00456535
- Volume :
- 276
- Database :
- Academic Search Index
- Journal :
- Chemosphere
- Publication Type :
- Academic Journal
- Accession number :
- 153070751
- Full Text :
- https://doi.org/10.1016/j.chemosphere.2021.130012