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Evaluation of passive samplers with neutral or ion-exchange polymer coatings to determine freely dissolved concentrations of the basic surfactant lauryl diethanolamine: Measurements of acid dissociation constant and organic carbon-water sorption coefficient.
J Chromatogr A. 2013 Nov 08; 1315:8-14.JC

Abstract

A passive sampler tool (solid-phase microextraction, SPME) was optimized to measure freely dissolved concentrations (Cw,free) of lauryl diethanolamine (C12-DEA). C12-DEA can be protonated and act as a cationic surfactant. From the pH-dependent sorption to neutral SPME coatings (polyacrylate and PDMS), a pKa of 8.7 was calculated, which differs more than two units from the value of 6.4 reported elsewhere. Polyacrylate coated SPME could not adequately sample largely protonated C12-DEA in humic acid solutions of pH 6. A new hydrophobic SPME coating with cation-exchange properties (C18/SCX) sorbed C12-DEA 100 fold stronger than polyacrylate, because it specifically sorbs protonated C12-DEA species. The C18/SCX-SPME fiber showed linear calibration isotherms in a concentration range of <1 nM-1 μM (well below the CMC). Using the C18/SCX-SPME fibers, linear sorption isotherms to Aldrich humic acid at pH 6 (ionic strength 0.015 M) were measured over a broad concentration range with a sorption coefficient of 10(5.3).

Authors+Show Affiliations

College of Environmental Science and Engineering, Ministry of Education Key Laboratory of Pollution Processes and Environmental Criteria, Tianjin Key Laboratory of Environmental Remediation and Pollution Control, Nankai University, Wei Jin Road 94, Tianjin 300071, China.No affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

24094752

Citation

Wang, Fang, et al. "Evaluation of Passive Samplers With Neutral or Ion-exchange Polymer Coatings to Determine Freely Dissolved Concentrations of the Basic Surfactant Lauryl Diethanolamine: Measurements of Acid Dissociation Constant and Organic Carbon-water Sorption Coefficient." Journal of Chromatography. A, vol. 1315, 2013, pp. 8-14.
Wang F, Chen Y, Hermens JL, et al. Evaluation of passive samplers with neutral or ion-exchange polymer coatings to determine freely dissolved concentrations of the basic surfactant lauryl diethanolamine: Measurements of acid dissociation constant and organic carbon-water sorption coefficient. J Chromatogr A. 2013;1315:8-14.
Wang, F., Chen, Y., Hermens, J. L., & Droge, S. T. (2013). Evaluation of passive samplers with neutral or ion-exchange polymer coatings to determine freely dissolved concentrations of the basic surfactant lauryl diethanolamine: Measurements of acid dissociation constant and organic carbon-water sorption coefficient. Journal of Chromatography. A, 1315, 8-14. https://doi.org/10.1016/j.chroma.2013.09.041
Wang F, et al. Evaluation of Passive Samplers With Neutral or Ion-exchange Polymer Coatings to Determine Freely Dissolved Concentrations of the Basic Surfactant Lauryl Diethanolamine: Measurements of Acid Dissociation Constant and Organic Carbon-water Sorption Coefficient. J Chromatogr A. 2013 Nov 8;1315:8-14. PubMed PMID: 24094752.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Evaluation of passive samplers with neutral or ion-exchange polymer coatings to determine freely dissolved concentrations of the basic surfactant lauryl diethanolamine: Measurements of acid dissociation constant and organic carbon-water sorption coefficient. AU - Wang,Fang, AU - Chen,Yi, AU - Hermens,Joop L M, AU - Droge,Steven T J, Y1 - 2013/09/14/ PY - 2013/07/22/received PY - 2013/09/06/revised PY - 2013/09/10/accepted PY - 2013/10/8/entrez PY - 2013/10/8/pubmed PY - 2014/3/19/medline KW - Cation-exchange KW - Cationic surfactant KW - Humic acid KW - SPME-fibers KW - Sorption KW - pK(a) SP - 8 EP - 14 JF - Journal of chromatography. A JO - J Chromatogr A VL - 1315 N2 - A passive sampler tool (solid-phase microextraction, SPME) was optimized to measure freely dissolved concentrations (Cw,free) of lauryl diethanolamine (C12-DEA). C12-DEA can be protonated and act as a cationic surfactant. From the pH-dependent sorption to neutral SPME coatings (polyacrylate and PDMS), a pKa of 8.7 was calculated, which differs more than two units from the value of 6.4 reported elsewhere. Polyacrylate coated SPME could not adequately sample largely protonated C12-DEA in humic acid solutions of pH 6. A new hydrophobic SPME coating with cation-exchange properties (C18/SCX) sorbed C12-DEA 100 fold stronger than polyacrylate, because it specifically sorbs protonated C12-DEA species. The C18/SCX-SPME fiber showed linear calibration isotherms in a concentration range of <1 nM-1 μM (well below the CMC). Using the C18/SCX-SPME fibers, linear sorption isotherms to Aldrich humic acid at pH 6 (ionic strength 0.015 M) were measured over a broad concentration range with a sorption coefficient of 10(5.3). SN - 1873-3778 UR - https://www.unboundmedicine.com/medline/citation/24094752/Evaluation_of_passive_samplers_with_neutral_or_ion_exchange_polymer_coatings_to_determine_freely_dissolved_concentrations_of_the_basic_surfactant_lauryl_diethanolamine:_Measurements_of_acid_dissociation_constant_and_organic_carbon_water_sorption_coefficient_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0021-9673(13)01472-6 DB - PRIME DP - Unbound Medicine ER -