title: Degradation of triphenylborane-pyridine antifouling agent in water by copper ions.
abstract: Triphenylborane-pyridine (TPBP) is an antifouling compound used in Asian countries, including Japan, and its residue has not been detected in aquatic environments to date. There are limited data on its fate for environmental management. The purpose of this study was to evaluate whether TPBP is degraded by metal ions in aquatic environments. TPBP with metal ions in 20 mM sodium acetate buffer at pH 8.0 was placed at 25 degrees C in the dark for 24 h. The concentrations of TPBP and its degradation products, such as diphenylboronic acid, phenylboronic acid (MPB), phenol, benzene, biphenyl, and boron were determined. The presence of copper ions (50 mg/l), but not zinc or manganese ions, resulted in complete degradation of TPBP in 24 h. The TPBP degradation was much faster than the boron production in the initial reaction (0-1 h) with copper salts, depending on the copper salts tested. TPBP was degraded by copper ions (5 mg/l) in 24 h, producing phenol, MPB, biphenyl, and borate. Cu2+ as copper(II) chloride or copper(II) acetate led to complete degradation of TPBP, and thylenediaminetetraacetic acid disodium salt addition suppressed the TPBP degradation. Cu+ as copper(I) acetate also completely degraded TPBP, and bathocuproine addition suppressed the TPBP degradation. This suggests that copper ions existing in natural environments might degrade TPBP released from antifouling paint into water, and this could be one of the important mechanisms to dissipate TPBP residues in aquatic environments.
authors: Graduate School of Maritime Sciences, Kobe University, Kobe 658-0022, Japan.
authors: Ai
authors: A
authors: Tsuboi
authors: Research Center for Inland Seas, Kobe University, Kobe 658-0022, Japan.
authors: Hideo
authors: H
authors: Okamura
authors: Graduate School of Maritime Sciences, Kobe University, Kobe 658-0022, Japan.
authors: Netnapit
authors: N
authors: Kaewchuay
authors: Graduate School of Maritime Sciences, Kobe University, Kobe 658-0022, Japan.
authors: Keiichi
authors: K
authors: Fukushi
authors: College of Environmental Science and Engineering, Yangzhou University, Yangzhou, Jiangsu 225127, People's Republic of China.
authors: Xiaojian
authors: X
authors: Zhou
authors: Faculty of Agriculture, Shizuoka University, Shizuoka 422-8529, Japan.
authors: Tomoaki
authors: T
authors: Nishida
mesh_terms: D001880:Boranes / Q000737:chemistry* / Q000302:isolation & purification; D002413:Cations, Divalent / Q000737:chemistry; D003300:Copper / Q000737:chemistry*; D010150:Paint / Q000032:analysis; D011725:Pyridines / Q000737:chemistry* / Q000302:isolation & purification; D012492:Salts / Q000737:chemistry; D014867:Water / Q000032:analysis; D014874:Water Pollutants, Chemical / Q000737:chemistry* / Q000302:isolation & purification
chemical_list: D001880:Boranes; D002413:Cations, Divalent; D011725:Pyridines; D012492:Salts; D014874:Water Pollutants, Chemical; C577849:pyridine triphenylborane; D014867:Water; D003300:Copper