title: Quantitative evaluation of noncovalent interactions between polyphosphate and dissolved humic acids in aqueous conditions.
abstract: As one kind of phosphorus species, polyphosphate (poly-P) is ubiquitous in natural environments, and the potential interactions between poly-P and humic substances in the sediments or natural waters would influence the fate of poly-P in the environments. However, the mechanism of the interactions has not yet been understood clearly. In this work, the characteristics and mechanisms of the interactions between humic acids (HA) and two model poly-P compounds with various chain lengths have been investigated. Results show that a stable polyphosphate-HA complex would be formed through the noncovalent interactions, and hydrogen bond might be the main driving force for the binding process, which might be formed between the proton-accepting groups of poly-P (e.g., PO and P-O(-)) and the oxygen containing functional groups in HA. Our findings implied that the presence of humic substances in natural waters, soils and sediments would influence the potential transport and/or mobility of environmental poly-P.
authors.affiliation: CAS Key Laboratory of Urban Pollutant Conversion, Department of Chemistry, University of Science and Technology of China, Hefei, 230026, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Fang
authors.affiliation: CAS Key Laboratory of Urban Pollutant Conversion, Department of Chemistry, University of Science and Technology of China, Hefei, 230026, China. Electronic address: gpsheng@ustc.edu.cn.
authors.forename: Guo-Ping
authors.initials: GP
authors.lastname: Sheng
authors.affiliation: CAS Key Laboratory of Urban Pollutant Conversion, Department of Chemistry, University of Science and Technology of China, Hefei, 230026, China.
authors.forename: Long-Fei
authors.initials: LF
authors.lastname: Wang
authors.affiliation: Department of Chemical Physics, University of Science and Technology of China, Hefei, 230026, China.
authors.forename: Xiao-Dong
authors.initials: XD
authors.lastname: Ye
authors.affiliation: CAS Key Laboratory of Urban Pollutant Conversion, Department of Chemistry, University of Science and Technology of China, Hefei, 230026, China.
authors.forename: Han-Qing
authors.initials: HQ
authors.lastname: Yu
mesh_terms: D004785:Environmental Pollutants / Q000737:chemistry*; D019015:Geologic Sediments / Q000737:chemistry; D006812:Humic Substances; D006860:Hydrogen Bonding; D011122:Polyphosphates / Q000737:chemistry*; D012987:Soil / Q000737:chemistry; D014867:Water / Q000737:chemistry
chemical_list: D004785:Environmental Pollutants; D006812:Humic Substances; D011122:Polyphosphates; D012987:Soil; D014867:Water
keywords: (31)P nuclear magnetic resonance; Humic acids; Hydrogen bonding; Isothermal titration calorimetry; Polyphosphate