Occurrence and source characterization of perfluorochemicals in an urban watershed.

Perfluorochemicals (PFCs) are used in numerous applications, mainly as surfactants, and occur ubiquitously in the environment as complex mixtures. This study was undertaken to characterize the occurrence and sources of commonly detected PFC compounds in surface waters of the Marina catchment, a watershed that drains an urbanized section of Singapore. Of the 19 target PFCs, 13 were detected with perfluorooctanoic acid (PFOA) (5-31 ng L(-1)) and perfluorooctane sulfonate (PFOS) (1-156 ng L(-1)) being the dominant components. Other compounds detected included perfluoroalkyl carboxylates (C7-C12) and perfluoroalkyl sulfonates (C6 and C8). Sulfonamide compounds detected 2-(N-ethylperfluorooctanesulfonamido) acetic acid (N-EtFOSAA), 2-(N-methylperfluorooctanesulfonamido) acetic acid (N-MeFOSAA), perfluorooctanesulfonamido acetic acid (FOSAA) and perfluorooctanesulfonamide (FOSA) were putative transformation products of N-EtFOSE and N-MeFOSE, the N-ethylated and N-methylated ethyl alcohol derivatives, respectively. Surface water concentrations were generally higher during dry weather than during storm water flow: the median concentrations of total PFCs in dry and wet weather were 57 and 138 ng L(-1) compared to 42 and 79 ng L(-1), respectively, at Stamford and Alexandra canal, suggesting the presence of a continuous source(s) which is subject to dilution during storm events. In rain water, median concentrations were 6.4 ng L(-1), suggesting rain contributed from 12-25% to the total PFC load for non-point source sites. The longitudinal concentration profile along one of the canals revealed a point source of sulfonated PFCs (PFOS), believed to originate from aqueous film-forming foam (AFFF). Sources were characterized using principal component analysis (PCA) and by plotting PFHxS/PFOA against PFOS/PFOA. Typical surface waters exhibit PFOS/PFOA and PFHxS/PFOA ratios below 0.9 and 0.5, respectively. PCA plots reveal waters impacted by "non-typical" PFC sources in Alexandra canal.

[1]  Kurunthachalam Kannan,et al.  Perfluoroalkyl sulfonates and perfluorocarboxylates in two wastewater treatment facilities in Kentucky and Georgia. , 2007, Water research.

[2]  Matt F Simcik,et al.  Ratio of perfluorochemical concentrations as a tracer of atmospheric deposition to surface waters. , 2005, Environmental science & technology.

[3]  Ian T Cousins,et al.  Sources, fate and transport of perfluorocarboxylates. , 2006, Environmental science & technology.

[4]  Peter Egeghy,et al.  Perfluorinated compounds in the Cape Fear Drainage Basin in North Carolina. , 2007, Environmental science & technology.

[5]  Scott A Mabury,et al.  Polyfluorinated telomer alcohols and sulfonamides in the North American troposphere. , 2004, Environmental science & technology.

[6]  Jennifer A. Field,et al.  Determination of perfluorocarboxylates in groundwater impacted by fire-fighting activity , 1999 .

[7]  Paul D. Jones,et al.  Perfluorinated compounds in streams of the Shihwa industrial zone and Lake Shihwa, South Korea , 2006, Environmental toxicology and chemistry.

[8]  Scott A Mabury,et al.  Monitoring perfluorinated surfactants in biota and surface water samples following an accidental release of fire-fighting foam into Etobicoke Creek. , 2002, Environmental science & technology.

[9]  W. Liu,et al.  Perfluorosulfonates and perfluorocarboxylates in snow and rain in Dalian, China. , 2009, Environment International.

[10]  N Yamashita,et al.  Perfluorinated compounds in coastal waters of Hong Kong, South China, and Korea. , 2004, Environmental science & technology.

[11]  Christine Spencer,et al.  Poly and perfluorinated carboxylates in North American precipitation. , 2006, Environmental science & technology.

[12]  Timothy J Wallington,et al.  Degradation of fluorotelomer alcohols: a likely atmospheric source of perfluorinated carboxylic acids. , 2004, Environmental science & technology.

[13]  J. Giesy,et al.  Peer Reviewed: Perfluorochemical Surfactants in the Environment , 2002 .

[14]  Martin Reinhard,et al.  Perfluorochemicals in water reuse. , 2008, Chemosphere.

[15]  S. Fujii,et al.  Contamination of perfluorooctane sulfonate (PFOS) and perfluorooctanoate (PFOA) in surface water of the Yodo River basin (Japan) , 2008 .

[16]  Jennifer A Field,et al.  Occurrence and persistence of perfluorooctanesulfonate and other perfluorinated surfactants in groundwater at a fire-training area at Wurtsmith Air Force Base, Michigan, USA. , 2003, Journal of environmental monitoring : JEM.

[17]  M. Nadal,et al.  Levels of perfluorochemicals in water samples from Catalonia, Spain: is drinking water a significant contribution to human exposure? , 2008, Environmental science and pollution research international.

[18]  Shigeo Fujii,et al.  Perfluorooctane sulfonate (PFOS) and perfluorooctanoic acid (PFOA) in sewage treatment plants. , 2009, Water research.

[19]  Hideshige Takada,et al.  Evaluation of wastewater and street runoff as sources of perfluorinated surfactants (PFSs). , 2009, Chemosphere.

[20]  Kurunthachalam Kannan,et al.  Mass loading and fate of perfluoroalkyl surfactants in wastewater treatment plants. , 2006, Environmental science & technology.

[21]  V. Matthias,et al.  Wet deposition of poly- and perfluorinated compounds in Northern Germany. , 2010, Environmental pollution.

[22]  Yuki Muramatsu,et al.  Occurrence and sources of perfluorinated surfactants in rivers in Japan. , 2008, Environmental science & technology.

[23]  Kouji Harada,et al.  Perfluorooctanoate and Perfluorooctane Sulfonate Concentrations in Surface Water in Japan , 2004, Journal of occupational health.

[24]  E. Kissa.  Fluorinated surfactants : synthesis, properties, applications , 1994 .

[25]  C. Criddle,et al.  Quantitative determination of perfluorochemicals in sediments and domestic sludge. , 2005, Environmental science & technology.

[26]  Tsuyoshi Okazawa,et al.  Analysis of perfluorinated acids at parts-per-quadrillion levels in seawater using liquid chromatography-tandem mass spectrometry. , 2004, Environmental science & technology.

[27]  Scott A Mabury,et al.  Significant residual fluorinated alcohols present in various fluorinated materials. , 2006, Environmental science & technology.

[28]  Kurunthachalam Kannan,et al.  Perfluorinated acids in air, rain, snow, surface runoff, and lakes: relative importance of pathways to contamination of urban lakes. , 2007, Environmental science & technology.

[29]  Martin Exner,et al.  Perfluorinated Surfactants in Surface and Drinking Waters (9 pp) , 2006 .

[30]  Jennifer A Field,et al.  Quantitative determination of fluorotelomer sulfonates in groundwater by LC MS/MS. , 2004, Environmental science & technology.

[31]  N Yamashita,et al.  Perfluorinated compounds in the Pearl River and Yangtze River of China. , 2007, Chemosphere.

[32]  Yasuyuki Zushi,et al.  First-flush loads of perfluorinated compounds in stormwater runoff from Hayabuchi River basin, Japan served by separated sewerage system. , 2009, Chemosphere.

[33]  Richard G Luthy,et al.  Sorption of perfluorinated surfactants on sediments. , 2006, Environmental science & technology.

[34]  V. Zitko.  Characterization of PCBs by principal component analysis (PCA of PCB) , 1989 .

[35]  Martin Kraft,et al.  Biomonitoring of Perfluorinated Compounds in Children and Adults Exposed to Perfluorooctanoate-Contaminated Drinking Water , 2008, Environmental health perspectives.

[36]  M. A. Mohd,et al.  Perfluorooctanesulfonate and related fluorochemicals in human blood from several countries. , 2004, Environmental science & technology.

[37]  Nobuyoshi Yamashita,et al.  A global survey of perfluorinated acids in oceans. , 2005, Marine pollution bulletin.