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High-Throughput Measurement and Classification of Organic P in Environmental Samples
Published on: June 8, 2011
Chain-Length-Selective Hydrolysis of Polyphosphate Fertilizer on Soil Goethite
Jingxu Yang1, Lingmei Ji1, Yi Tan1
1Engineering Research Center of Comprehensive Utilization and Clean Processing of Phosphorus Resources of Ministry of Education, School of Chemical Engineering, Sichuan University, Chengdu 610065, China.
Abstract:
The nutrient activity of ammonium polyphosphates (APPs, (NH4)n+2PnO3n+1, n < 20) in soils is closely associated with the minerals and polyphosphate (Poly-P) constitution. Herein, we investigate the differential performances of APP1 (P species of P1-P2) and APP2 (P species of P1-P7) mixed with goethite (O═Fe-OH). Goethite and dissociated Fe3+ both facilitate P-O cleavage, especially for the longer chains from APP2, with a hydrolysis constant (K) increase of 209% in a well-fitted first-order model. The terminal P-O bond lengths of Poly-Ps increase by 0.02-0.04 Å after being adsorbed. Subsequently, Poly-Ps promote goethite dissolution via loosening the solid Fe-O bond after a multi-dentate coordination with surface Fe3+. With hydrolysis accelerated by goethite, APP2 could quickly cleave to supply available P1, and the derived P2 would continue to spread Fe3+ out. These findings highlight the ability of Poly-Ps with abundant and long-chain P species to activate Fe and P in goethite-dominated soils.
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