Phosphorus-arsenic interactions in variable-charge soils in relation to arsenic mobility and bioavailability
Bolan, N; Mahimairaja, S; Kunhikrishnan, A; Choppala, G
| HERO ID | 1579241 |
|---|---|
| In Press | No |
| Year | 2013 |
| Title | Phosphorus-arsenic interactions in variable-charge soils in relation to arsenic mobility and bioavailability |
| Authors | Bolan, N; Mahimairaja, S; Kunhikrishnan, A; Choppala, G |
| Journal | Science of the Total Environment |
| Volume | 463-464 |
| Issue | Elsevier |
| Page Numbers | 1154-1162 |
| Abstract | Phosphorus (P) influences arsenic (As) mobility and bioavailability which depends on the charge components of soil. The objective of this study was to examine P-As interaction in variable-charge allophanic soils in relation to P-induced As mobilization and bioavailability. In this work, the effect of P on arsenate [As(V)] adsorption and desorption was examined using a number of allophanic and non-allophanic soils which vary in their anion adsorption capacity. The effect of P on As uptake by Indian mustard (Brassica juncea L.) plants was examined using a solution culture, and a soil plant growth experiment involving two As-spiked allophanic and non-allophanic soils which vary in their anion adsorption capacity, and a field As-contaminated sheep dip soil. Arsenate adsorption increased with an increase in the anion adsorption capacity of soils. The addition of P resulted in an increase in As desorption, and the effect was more pronounced in the case of allophanic soil. In the case of both As-spiked soils and field contaminated sheep-dip soil, application of P increased the desorption of As, thereby increasing its bioavailability. The effect of P on As uptake was more pronounced in the high anion adsorbing allophanic than low adsorbing non-allophanic soil. In the case of solution culture, As phytoavailability decreased with increasing concentration of P which is attributed to the competition of P for As uptake by roots. While increasing P concentration in solution decreased the uptake of As, it facilitated the translocation of As from root to shoot. The net effect of P on As phytoavailability in soils depends on the extent of P-induced As mobilization in soils and P-induced competition for As uptake by roots. The P-induced mobilization of As could be employed in the phytoremediation of As-contaminated sites. However, care must be taken to minimize the leaching of As mobilized through the P-induced desorption, thereby resulting in groundwater and off site contamination. |
| Doi | 10.1016/j.scitotenv.2013.04.016 |
| Pmid | 23639210 |
| Wosid | WOS:000325831200126 |
| Url | https://linkinghub.elsevier.com/retrieve/pii/S0048969713004373 |
| Is Certified Translation | No |
| Dupe Override | No |
| Is Public | Yes |
| Language Text | English |
| Keyword | Arsenic; Adsorption; Phosphorus; Variable-charge soil; Bioavailability |