Solid–Solution Dynamics of Arsenic and Phosphorus in Paddy Soil: A Theoro-Analytical Approach

This dataset supports the research article titled “Solid–Solution Dynamics of Arsenic and Phosphorus in Paddy Soil: A Theoro-analytical Approach.” The study tests the hypothesis that arsenic and phosphorus in arsenic-impacted paddy soils exhibit distinct solid–solution partitioning governed by specific geochemical mechanisms. Using a combination of sequential extraction, in-situ porewater analysis, and geochemical equilibrium modeling, we investigate the dominant phases and chemical conditions influencing their mobility.
The dataset comprises:
• Sequential extraction data for arsenic and phosphorus (Table F1),
• Geochemical properties of soil solution as model input (Table 1),
• Speciation information of the studied elements in the soil solution (Table 2),
• Saturation indices of prospective secondary minerals (Table F2),
• Solubility equations (Table F3),
• Input–output mass balance of arsenic and phosphorus in the experimental field (Table S4),
Notable findings include the central role of Fe-/Mn-(hydr)oxides and Ca carbonates in arsenic retention and phosphorus stability, the modeled possibility of discrete secondary mineral precipitation under field pH–Eh conditions, and the potential of Mn(II)-based soil amendments to mitigate arsenic bioavailability while preserving phosphorus availability.
Data collection was performed in a field-scale experiment in the Bengal Delta Plain region of India. Sequential extraction followed standard fractionation protocols, while porewater chemistry was measured via field filtration and laboratory analyses. Thermodynamic modeling was conducted using GWB platform, calibrated with experimental inputs.
These data offer valuable inputs for researchers in soil chemistry, geochemistry, and environmental remediation, enabling mechanistic modeling of trace element dynamics in flooded soils under agricultural stress.