Complexation of trace organic contaminants with fractionated dissolved organic matter: Implications for mass spectrometric quantification

Selene Hernandez Ruiz, Samanthi Wickramasekara, Leif M Abrell, Xiaodong Gao, Benny Chefetz, Jon Chorover

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

Interaction with aqueous phase dissolved organic matter (DOM) can alter the fate of trace organic contaminants of emerging concern once they enter the water cycle. In order to probe possible DOM binding mechanisms and their consequences for contaminant detection and quantification in natural waters, a set of laboratory experiments was conducted with aqueous solutions containing various operationally-defined "hydrophilic" and "hydrophobic" freshwater DOM fractions isolated by resin adsorption techniques from reference Suwannee River natural organic matter (SROM). Per unit mass of SROM carbon, hydrophobic acids (HoA) comprised the largest C fraction (0.63±0.029), followed by hydrophilic-neutrals (HiN, 0.11±0.01) and acids (HiA, 0.09±0.017). Aqueous solutions comprising 8mgL-1 DOC of each SROM fraction were spiked with a concentration range (10-1000μgL-1) of bisphenol A (BPA), carbamazepine (CBZ), or ibuprofen (IBU) as model target compounds in 24mM NH4HCO3 background electrolyte at pH 7.4. Contaminant interaction with the SROM fractions was probed using fluorescence spectroscopy, and effects on quantitative analysis of the target compounds were measured using direct aqueous-injection liquid chromatography tandem mass spectrometry (LC-MS/MS). Total quenching was greater for the hydrophilic fractions of SROM and associations were principally with protein-like and fulvic acid-like constituents. Whereas LC-MS/MS recoveries indicated relatively weak interactions with most SROM factions, an important exception was the HiA fraction, which diminished recovery of CBZ and IBU by ca. 30% and 70%, respectively, indicating relatively strong molecular interactions.

Original languageEnglish (US)
Pages (from-to)344-350
Number of pages7
JournalChemosphere
Volume91
Issue number3
DOIs
StatePublished - Apr 2013

Fingerprint

Complexation
Rivers
complexation
dissolved organic matter
Biological materials
Impurities
organic matter
pollutant
river
Ibuprofen
Carbamazepine
aqueous solution
Water Cycle
Acids
fluorescence spectroscopy
acid
Fluorescence Spectrometry
fulvic acid
Tandem Mass Spectrometry
Fresh Water

Keywords

  • EDC
  • Fluorescence quenching
  • LC-MS/MS
  • PPCP
  • Suwannee River natural organic matter

ASJC Scopus subject areas

  • Environmental Chemistry
  • Chemistry(all)

Cite this

Complexation of trace organic contaminants with fractionated dissolved organic matter : Implications for mass spectrometric quantification. / Ruiz, Selene Hernandez; Wickramasekara, Samanthi; Abrell, Leif M; Gao, Xiaodong; Chefetz, Benny; Chorover, Jon.

In: Chemosphere, Vol. 91, No. 3, 04.2013, p. 344-350.

Research output: Contribution to journalArticle

Ruiz, Selene Hernandez ; Wickramasekara, Samanthi ; Abrell, Leif M ; Gao, Xiaodong ; Chefetz, Benny ; Chorover, Jon. / Complexation of trace organic contaminants with fractionated dissolved organic matter : Implications for mass spectrometric quantification. In: Chemosphere. 2013 ; Vol. 91, No. 3. pp. 344-350.
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