Publication Details (including relevant citation information):
Division of Environmental Chemistry
241st ACS National Meeting & Exposition
March 27-31, 2011
Analysis of specific parameters in wastewater is always a challenge due to its complex matrix and continuous variability. This is especially true in treatment processes such as nitrogen removal through denitrification where methanol or acetic acid are added as a carbon source and monitored at low concentrations. A promising analytical method, headspace solid-phase microextraction (SPME) was introduced with gas chromatography-mass spectrometry to monitor the residual of methanol and acetic acid concentration. Factors such as fiber properties, incubation conditions (agitation and temperature), pH value and salt content that significantly impacted the extraction efficiency have been studied. Precision, linearity and detection limits were determined. Polyethylene glycol (PEG) fibers were chosen to extract small molecular weight and polar compounds, such as methanol. The extraction efficiency of acetic acid significantly increased after acidification (pH<2). Agitation, higher incubation temperature and longer extraction time facilitated SPME fiber absorption. Salt impact was more significant on methanol extraction than acetic acid. Calibrations were determined for the two compounds analyzed over a concentration range of 1 …100 µg/mL and 200 µg/mL, respectively.
Address (URL): http://abstracts.acs.org/chem/241nm/program/view.php