title: Preparation and properties of a coated slow-release and water-retention biuret phosphoramide fertilizer with superabsorbent.
abstract: In this investigation, a novel water-insoluble slow-release fertilizer, biuret polyphosphoramide (BPAM), was formulated and synthesized from urea, phosphoric acid (H(3)PO(4)), and ferric oxide (Fe(2)O(3)). The structure of BPAM was characterized by Fourier transform infrared (FTIR) spectroscopy. Subsequently, a coated slow-release BPAM fertilizer with superabsorbent was prepared by ionic cross-linked carboxymethylchitosan (the core), acrylic acid, acrylamide, and active carbon (the coating). The variable influences on the water absorbency were investigated and optimized. Component analysis results showed that the coated slow-release BPAM contained 5.66% nitrogen and 11.7% phosphorus. The property of water retention, the behavior of slow release of phosphorus, and the capacity of adsorption of cations were evaluated, and the results revealed that the product not only had good slow-release property and excellent water retention capacity but also higher adsorption capacities of cations in saline soil.
authors.affiliation: Key Laboratory of Resources and Environmental Chemistry of West China, Department of Chemistry, Hexi University, Zhangye, People's Republic of China.
authors.forename: Shuping
authors.initials: S
authors.lastname: Jin
authors.forename: Guoren
authors.initials: G
authors.lastname: Yue
authors.forename: Lei
authors.initials: L
authors.lastname: Feng
authors.forename: Yuqi
authors.initials: Y
authors.lastname: Han
authors.forename: Xinghai
authors.initials: X
authors.lastname: Yu
authors.forename: Zenghu
authors.initials: Z
authors.lastname: Zhang
mesh_terms: D000327:Adsorption; D000577:Amides / Q000737:chemistry*; D001737:Biuret / Q000737:chemistry*; D002626:Chemistry, Pharmaceutical; D003692:Delayed-Action Preparations / Q000737:chemistry*; D004337:Drug Carriers / Q000737:chemistry*; D005308:Fertilizers / Q000032:analysis*; D063088:Phosphoramides; D010756:Phosphoric Acids / Q000737:chemistry*; D014867:Water / Q000032:analysis
chemical_list: D000577:Amides; D003692:Delayed-Action Preparations; D004337:Drug Carriers; D005308:Fertilizers; D063088:Phosphoramides; D010756:Phosphoric Acids; D014867:Water; C005438:phosphoramide; D001737:Biuret