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5164728 
Journal Article 
Photochemical Behavior of Organic Phosphate Esters in Aqueous Solutions Irradiated with a Mercury Lamp 
Ishikawa, S; Uchimura, Y; Baba, K; Eguchi, Y; Kido, K 
1992 
Yes 
Bulletin of Environmental Contamination and Toxicology
ISSN: 0007-4861
EISSN: 1432-0800 
49 
3 
368-374 
English 
In order to develop a means of removal of organic phosphate esters (OPEs) in water, some fundamental experiments with ultraviolet (UV) irradiation were performed with a mercury lamp, and photochemical behaviors and photodecomposition products were examined for 7 OPEs: tributyl phosphate (TBP), tris(chloropropyl) phosphate (TCPP), tris(2-chloroethyl) phosphate (TCEP), trioctyl phosphate (TOP), tris(dichloropropyl) phosphate (CRP), triphenyl phosphate (TPP), and tricresyl phosphate (TCP). The concentration of each OPE decreased exponentially with time, and the rate of OPE disappearance was represented by a first-order process. The values of the pseudo-first-order rate constant k at pH 3 were (per hour): TBP >15; TCPP 2.3; TCEP 5.1; TOP 3.0; CRP 0.73; TPP >40; and TCP 20/. The values (per hour) at ph 10 were: TBP >10; TCPP 4.5; TCEP 4.1; TOP 1.5; CRP 1.6; TPP >40; and TCP >15. Aryl phosphates, TPP and TCP, which had large molar extinction coefficients in the range of 230-280 nm due to the benzene ring, were more degradable than the other OPEs. About 23% and 2%, of phenols (as phenol) were produced after 3 h irradiation for TPP and TCP, respectively, under alkaline conditions. The produced phenols were decomposed by further irradiation. (Doria-PTT) 
Water Resources Abstracts; Ultraviolet radiation; Organophosphorus compounds; Esters; Water treatment; Wastewater treatment; Phosphates; Kinetics; Hydrogen ion concentration; Irradiation; Phenols; Phosphate removal