title: Interaction between Al3+ and acrylic acid and polyacrylic acid in acidic aqueous solution: a model experiment for the behavior of Al3+ in acidified soil solution.
abstract: From the viewpoint of the phytotoxicity and mobility of Al(3+) released from soil minerals due to soil acidification, the interaction between Al(3+) and acrylic acid (AA) and polyacrylic acid (PAA) as a model compound of fulvic acid was investigated. The interaction was examined at pH 3 so as to avoid the hydrolysis of Al(3+). The interaction between Al(3+) and AA was weak. However, the interaction between Al(3+) and PAA was strong and depended on the initial (COOH in PAA)/Al molar ratio (R(P)) of the solution. For the range of 1/R(P), the interaction between Al(3+) and PAA can be divided into three categories: (1) 1:1 Al-PAA-complex (an Al(3+) combines to a carboxyl group), (2) intermolecular Al-PAA-complex (an Al(3+) combines to more than 2 carboxyl groups of other Al-PAA-complexes) in addition to the 1:1 Al-PAA-complex and (3) precipitation of intermolecular complexes. In conclusion, R(P) is an important factor affecting the behavior of Al(3+) in acidic soil solution.
authors.affiliation: Department of Chemistry, Faculty of Science, Kyushu University, 6-10-1 Hakozaki, Higashi, Fukuoka 812-8581, Japan.
authors.forename: Mayumi
authors.initials: M
authors.lastname: Etou
authors.forename: Yuka
authors.initials: Y
authors.lastname: Masaki
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Tsuji
authors.forename: Tomoyuki
authors.initials: T
authors.lastname: Saito
authors.forename: Shuqin
authors.initials: S
authors.lastname: Bai
authors.forename: Ikuko
authors.initials: I
authors.lastname: Nishida
authors.forename: Yoshihiro
authors.initials: Y
authors.lastname: Okaue
authors.forename: Takushi
authors.initials: T
authors.lastname: Yokoyama
mesh_terms: D000179:Acrylates / Q000737:chemistry*; D000180:Acrylic Resins / Q000737:chemistry*; D000535:Aluminum / Q000737:chemistry*; D012987:Soil / Q000737:chemistry*; D012996:Solutions; D014867:Water / Q000737:chemistry
chemical_list: D000179:Acrylates; D000180:Acrylic Resins; D012987:Soil; D012996:Solutions; D014867:Water; C006903:carbopol 940; D000535:Aluminum; C036658:acrylic acid