title: Photoinduced reduction of divalent mercury by quinones in the presence of formic acid under anaerobic conditions.
abstract: The laser flash photolysis technique (λ(exc)=355 nm) was used to investigate the mechanism of the HgCl(2) reduction mediated by CO(2)(-) radicals generated from quenching of the triplet states of 1,4-naphthoquinone (NQ) by formic acid. Kinetic simulations of the experimental signals support the proposed reaction mechanism. This system is of potential interest in the development of UV-A photoinduced photolytic procedures for the treatment of Hg(II) contaminated waters. The successful replacement of NQ with a commercial fulvic acid, as a model compound of dissolved organic matter, showed that the method is applicable to organic matter-containing waters without the addition of quinones.
authors.affiliation: Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas, Universidad Nacional de La Plata, CC 16, Suc. 4, 1900 La Plata, Argentina. a_berkovic@yahoo.com
authors.forename: Andrea M
authors.initials: AM
authors.lastname: Berkovic
authors.forename: Sonia G
authors.initials: SG
authors.lastname: Bertolotti
authors.forename: Laura S
authors.initials: LS
authors.lastname: Villata
authors.forename: Mónica C
authors.initials: MC
authors.lastname: Gonzalez
authors.forename: Reinaldo
authors.initials: R
authors.lastname: Pis Diez
authors.forename: Daniel O
authors.initials: DO
authors.lastname: Mártire
mesh_terms: D000693:Anaerobiosis; D052918:Environmental Restoration and Remediation / Q000379:methods; D005561:Formates / Q000737:chemistry*; D007700:Kinetics; D008628:Mercury / Q000032:analysis* / Q000737:chemistry; D010782:Photolysis; D011809:Quinones / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000737:chemistry; D018508:Water Purification / Q000379:methods
chemical_list: D005561:Formates; D011809:Quinones; D014874:Water Pollutants, Chemical; C030544:formic acid; D008628:Mercury