Affiliation:
1. Faculty of Agriculture, Belgrade, Serbia
2. RWTH Aachen University, Institute of Geology and Geochemistry of Petroleum and Coal, Aachen, Germany
Abstract
"On-line" pyrolysis coupled with gas chromatography (GC) was performed for
quantitative determination of poly(vinylpyrrolidone) (PVP) in wastewater
sample. Gas chromatography-mass spectrometry (GC-MS) showed that the main
product of pyrolysis of PVP, at high temperatures, is N-vinylpyrrolidone
(NVP). After that, different amounts of commercial PVP were pyrolyzed in
order to establish correlation between the amount of generated NVP (its GC
peak area) and the initial mass of pyrolyzed PVP. GC-FID analysis was used
for construction of calibration curve and for quantitative determination of
PVP. Very good linear correlation was obtained between the area of NVP peak,
generated during pyrolysis, and the initial mass of PVP (r2 = 0.998).
Further, solutions of known concentration of PVP were prepared in destilled
water ("spiked samples"). Spiked samples were preextracted with diethyl
ether and n-hexane, and after that, the water-layer was evaporated and
dissolved again in methanol. Analysis of pyrolysates of preextracted spiked
samples showed that the "recovery" of PVP was above 96 mas%. This finding
suggested that pre-extraction could be applied to reduce the concentration
of organic substances that could also be pyrolyzed, and thus hinder
identification and quantitative determination of PVP, without significant
loss of polymer. The sample of an industrial wastewater from Pancevo, Serbia
was investigated in the last part of this work. The sample was preextracted
in the same way as the spiked samples and than pyrolyzed. NVP was identified
by GC-MS in obtained pyrolysate, which was the evidence that PVP was present
in the wastewater sample. NVP was quantified on the basis of the peak area
in GC-FID chromatogram, and than the concentration of PVP in wastewater
sample was calculated based on calibration curve. Concentration of PVP in
industrial wastewater amounted 2.5 mg/L.
Publisher
National Library of Serbia
Subject
General Chemical Engineering,General Chemistry
Cited by
3 articles.
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