Transfer kinetics of polar organic compounds over polyethersulfone membranes in the passive samplers Pocis and Chemcatcher

Vermeirssen, Etiënne L. M., Dietschweiler, Conrad, Escher, Beate I., van der Voet, Jürgen and Hollender, Juliane (2012) Transfer kinetics of polar organic compounds over polyethersulfone membranes in the passive samplers Pocis and Chemcatcher. Environmental Science & Technology, 46 12: 6759-6766. doi:10.1021/es3007854


Author Vermeirssen, Etiënne L. M.
Dietschweiler, Conrad
Escher, Beate I.
van der Voet, Jürgen
Hollender, Juliane
Title Transfer kinetics of polar organic compounds over polyethersulfone membranes in the passive samplers Pocis and Chemcatcher
Journal name Environmental Science & Technology   Check publisher's open access policy
ISSN 0013-936X
Publication date 2012-06-01
Sub-type Article (original research)
DOI 10.1021/es3007854
Volume 46
Issue 12
Start page 6759
End page 6766
Total pages 8
Place of publication Washington, DC, United States
Publisher American Chemical Society
Collection year 2013
Language eng
Formatted abstract
Passive samplers for polar organic compounds often use a polyethersulfone (PES) membrane to retain the particulate sorbent material (e.g., in a POCIS; polar organic chemical integrative sampler) or to reduce the sampling rate and thus extend the kinetic regime (e.g., in a Chemcatcher). The transport kinetics over the PES membrane are evaluated here in a short-term (6 days) and a long-term (32 days) experiment with POCIS and Chemcatchers. Passive samplers were placed in a channel with flowing river water that was spiked with 22 organic chemicals including pharmaceuticals, pesticides and biocides; with logK ow (logarithmic octanol-water partitioning coefficient) values between -2.6 and 3.8. Samplers were removed at intervals and membranes and sorbent material were extracted and analyzed with LC-MS/MS. Uptake kinetics of the compounds fell between two extremes: (1) charged chemicals and chemicals of low hydrophobicity did not accumulate in PES and rapidly transferred to the sorbent (e.g., diclofenac) and (2) more hydrophobic chemicals accumulated strongly in the PES and appeared in the sorbent after a lag-phase (e.g., diazinon and diuron). Sorption kinetics were modeled with a three-compartment first-order kinetic model to determine uptake and elimination rate constants and partitioning coefficients. Water PES partitioning coefficients fitted with the model correlated well with experimentally determined values and logK ow. Sampling rates of Chemcatcher (0.02-0.10 L/d) and POCIS (0.02-0.30 L/d) showed similar patterns and correlated well. Thus the samplers are interchangeable in practical applications. Longer lag-phases may pose problems when calculating time-weighted average aqueous concentrations for short passive sampling windows and for a correct integrative sampling of fluctuating concentrations. (Figure Presented).
Keyword Chemical integrative samplers
Aquatic environments
Water
Herbicides
Pharmaceuticals
Contaminants
Calibration
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2013 Collection
National Research Centre for Environmental Toxicology Publications
 
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