title: Photodegradation of pentachlorophenol by sunlight in aquatic surface microlayers.
abstract: Photodegradation of pentachlorophenol (PCP) in aquatic surface microlayer (SM) was examined under natural sunlight. SM samples were collected using a glass plate, along with corresponding subsurface waters. PCP was added to samples of the SM and subsurface water. When all samples were exposed to the same natural sunlight conditions, the first order photodegradation rates of PCP in the SM water samples were different from those of PCP in corresponding subsurface water samples. The difference was correlated with the enrichment of dissolved organic carbon (DOC) in SM compared to the corresponding subsurface waters. Enhanced photodegradation in SM may be due to increased abundance of photoreactants related to the UV-absorbing properties of dissolved organic materials in the SM as the result of photo-induced reactions. Effects of environmental factors, pH and salinity, on photodegradation process of PCP in SM were also evaluated.
authors.affiliation: College of Environmental Science and Engineering, Tianjin University, Tianjin, China. cjiechi@yahoo.com
authors.forename: Jie
authors.initials: J
authors.lastname: Chi
authors.forename: Guo-Lan
authors.initials: GL
authors.lastname: Huang
mesh_terms: D004784:Environmental Monitoring; D004785:Environmental Pollutants / Q000032:analysis / Q000378:metabolism*; D006863:Hydrogen-Ion Concentration; D010416:Pentachlorophenol / Q000737:chemistry*; D010777:Photochemistry; D013472:Sunlight; D014466:Ultraviolet Rays; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000378:metabolism*
chemical_list: D004785:Environmental Pollutants; D014874:Water Pollutants, Chemical; D010416:Pentachlorophenol