Mineralogy of particulate inputs and P-speciation and mineralogy of recently accreted soils within Everglades stormwater treatment wetlands

Phosphorus (P) biogeochemical processes in wetlands are influenced by the chemical composition of both recently accreted and native soils. The evaluation influencing P transformations requires an understanding participating components. Here, we use X-ray diffraction (XRD), scanning electron microscopy (SEM)/energy-dispersive fluorescence spectroscopy (EDS), absorption near-edge (P-XANES), microprobe (μ-XRF) to examine mineralogy speciation solid phases entering within selected Everglades Stormwater Treatment Areas (STAs). Suspended particulates source waters (upstream STAs) STAs were examined compared with those recently-accreted soil (RAS) from inflow, mid-flow, outflow locations two flowways (FWs) STA-2: one dominated emergent aquatic vegetation (EAV) other submerged (SAV). Source water included carbonates silicates, whereas mineralogies STA RAS less diverse, CaCO3 having a lower silicate content, suggesting strong autochthonous influence on composition. No minerals detected via XRD. Discrete CaP particles evident, though uncommonly observed, three samples analyzed SEM/EDS. P-XANES indicated presence apatitic minerals. potential was supported μ-XRF correlation analysis that revealed correlations Ca K. Apatitic relatively refractory form their EAV SAV systems indicate remobilization release this will have smaller effect downstream oligotrophic conditions Florida than more labile forms P.