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ANZMAG 2025 Welcome to the 2025 14th ANZMAG Conference at […]

Phosphorus (P) speciation in natural environments is shaped by mineral interactions. Manganese oxy(hydr)oxides (MnOx) are powerful oxidants in nature and may promote the oxidative transformation of organic P compounds; yet little is known about the role of MnOx in the molecular transformation and speciation of P from natural organic matter. Here, we investigated the molecular transformation of vermicompost-derived organic P under acidic and alkaline pH conditions in dissolved organic matter (DOM) and soil over a 35 d period. Phosphorus K-edge X-ray absorption near edge structure revealed the formation of birnessite-adsorbed phosphate and Mn(II/III) phosphate at pH 4 and calcium phosphate at pH 8 in the DOM system. Birnessite-adsorbed phosphate was dominant in soils, followed by Mn(III) phosphate after 35 d. Fourier transform ion cyclotron resonance mass spectrometry indicated enhanced organic P sorption and transformation into higher molecular weight aromatic compounds under acidic conditions. These findings reveal that birnessite not only mediates P speciation through surface and redox-driven interactions but also facilitates organic P stabilization via molecular transformation. The study provides new insights into how MnOx can influence both P fate in natural environments, with implications for mechanisms controlling P mobility and long-term P retention in soils.

Quantifying the hydrological connectivity of wetland ecosystems is crucial for their sustainable management and conservation. Australian mountain peatlands typically form and persist on sloping terra....