A new method for the simultaneous determination of 12 volatile organic compounds (trans-1,2-dichloroethene, 1,1,1-trichloroethane, benzene, 1,2-dichloroethane, trichloroethene, toluene, 1,1,2-trichloroethane, tetrachloroethene, ethylbenzene, m-, p-, o-xylene)
in water samples by headspace solid phase microextraction (HS–SPME)–gas chromatography mass spectrometry (GC–MS) was described, using a 100 µm PDMS (polydimethylsiloxane) coated fibre. The response surface methodology was used to optimise the effect of the extraction
time and temperature, as well as the influence of the salt addition in the extraction process. Optimal conditions were extraction time and temperature of 30 min and −20°C, respectively, and NaCl concentration of 4 mol L−1. The detection limits
were in the range of 1.1 × 10−3–2.3 µg L−1 for the 12 volatile organic compounds (VOCs). Global uncertainties were in the range of 4–68%, when concentrations decrease from 250 µg L−1
down to the limits of quantification. The method proved adequate to detect VOCs in six river samples.
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experimental design (DoE);
volatile organic compounds (VOCs)
Document Type: Research Article
LEPÆ, Departamento de Engenharia Química,Faculdade de Engenharia da Universidade do Porto, Rua Dr. Roberto Frias4200–465 Porto, Portugal
Departamento de Engenharia Química,Faculdade de Engenharia da Universidade do Porto, Rua Dr. Roberto Frias4200–465 Porto, Portugal
February 15, 2012
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