Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.chemosphere.2010.12.030
Title: Occurrence and source characterization of perfluorochemicals in an urban watershed
Authors: Nguyen, V.T.
Reinhard, M.
Karina, G.Y.-H. 
Keywords: Occurrence
Perfluorochemicals
PFHxS
PFOA
PFOS
Urban watershed
Issue Date: Feb-2011
Citation: Nguyen, V.T., Reinhard, M., Karina, G.Y.-H. (2011-02). Occurrence and source characterization of perfluorochemicals in an urban watershed. Chemosphere 82 (9) : 1277-1285. ScholarBank@NUS Repository. https://doi.org/10.1016/j.chemosphere.2010.12.030
Abstract: 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) (5-31ngL-1) and perfluorooctane sulfonate (PFOS) (1-156ngL-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 138ngL-1 compared to 42 and 79ngL-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 6.4ngL-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. © 2010 Elsevier Ltd.
Source Title: Chemosphere
URI: http://scholarbank.nus.edu.sg/handle/10635/91108
ISSN: 00456535
DOI: 10.1016/j.chemosphere.2010.12.030
Appears in Collections:Staff Publications

Show full item record
Files in This Item:
There are no files associated with this item.

SCOPUSTM   
Citations

45
checked on May 22, 2018

WEB OF SCIENCETM
Citations

40
checked on May 22, 2018

Page view(s)

41
checked on May 11, 2018

Google ScholarTM

Check

Altmetric


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.