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DEVELOPMENT OF NEGLIGIBLE DEPLETION HOLLOW FIBER-PROTECTED LIQUID-PHASE MICROEXTRACTION FOR SENSING FREELY DISSOLVED TRIAZINES

In English

Författare

Summary, in English

A new sampling method, termed negligible depletion hollow fiber-protected liquid-phase microextraction, was developed for sensing the freely dissolved concentration (C free) and evaluating the availability of atrazine (ATR), desethyl atrazine (DEA), and simazine (SIM) in water. The sampling device was prepared by impregnating 1-octanol to both the pores and the lumen of a piece of polypropylene microporous hollow fiber membrane. After equilibrium and negligible depletion extraction, the 1-octanol in the lumen of the hollow fiber (10 mu l) was collected for determination of triazines. Determination of C free and the distribution coefficient to 1-octanol (D-OW) can be performed with this technique. A wide linear working range (1-200 mu g/L) and low detection limits (0.1-1 mu g/L) were obtained for triazines. Measured log D-OW values of DEA (1.44 +/- 0.04), SIM (2.06 +/- 0.06), and ATR (2.33 +/- 0.05) agreed well with those reported in the literature. The measured D-OW values were independent of the chemical concentration and sample pH (pH 3-10) and negligibly affected by the sample salinity (0-500 mM), suggesting that environmentally relevant pH and salinity have no significant effects on the availability of triazines. Although a slight (<= 31%) increase of C free was observed, one-way analysis of variance indicated the C free of triazines were not significantly affected by the presence of Aldrich humic acid, Acros humic acid, and bovine albumin V (dissolved organic carbon [DOC], 0-100 mg/L). From 3 to 36% of the spiked triazines, however, were found to associate with the dissolved organic matter (DOM) in surface-water samples (DOC, 32.0-61.9 mg/L), suggesting the origin of the DOM is a key parameter in determining its association with and, thus, the availability of triazines.

Publiceringsår

2009

Språk

Engelska

Sidor

231-238

Publikation/Tidskrift/Serie

Environmental Toxicology and Chemistry

Volym

28

Issue

2

Dokumenttyp

Artikel i tidskrift

Förlag

John Wiley & Sons Inc.

Ämne

  • Analytical Chemistry

Nyckelord

  • Triazines
  • Liquid-phase microextraction
  • Freely dissolved concentration
  • Dissolved organic matter

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 0730-7268