Screening Method for Nitroaromatic Compounds in Water Based on Solid-Phase Microextraction and Infrared Spectroscopy

A new method is described for determining nitroaromatic compounds in water that combines solid-phase microextraction (SPME) and infrared (IR) spectroscopy. In this method, the compounds are extracted from a 250-mL volume of water into a small square (3.2 cm × 3.2 cm × 61.2 μm thick) of silicone poly...

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Bibliographic Details
Published in:Environmental science & technology 2001-09, Vol.35 (17), p.3507-3512
Main Authors: Stahl, Danese C, Tilotta, David C
Format: Article
Language:English
Subjects:
Analysis methods
Applied sciences
Chromatography, Gas
Environment
Environmental monitoring
Environmental Monitoring - methods
Exact sciences and technology
Hydrocarbons, Aromatic - analysis
Natural water pollution
Nitrogen Compounds - analysis
Pollution
Reproducibility of Results
Scientific imaging
Soil and sediments pollution
Spectrophotometry, Infrared
Spectrum analysis
Water
Water Pollutants, Chemical - analysis
Water treatment and pollution
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Summary:A new method is described for determining nitroaromatic compounds in water that combines solid-phase microextraction (SPME) and infrared (IR) spectroscopy. In this method, the compounds are extracted from a 250-mL volume of water into a small square (3.2 cm × 3.2 cm × 61.2 μm thick) of silicone polycarbonate copolymer film (MEM-213). Five nitroaromatic compounds, including 2,4,6-trinitrotoluene (TNT), were chosen to evaluate the SPME/IR procedure. Quantitation limits for the five test compounds range from 50 μg/L for TNT to 400 μg/L for nitrobenzene. Precision values, determined at aqueous concentrations of four times the quantitation limit, range from 4 to 7%, and linear dynamic ranges extend to the maximum limit of the IR instrumentation. The potential of this SPME/IR method for determining nitroaromatics in natural water samples was also investigated by extracting “real world” soil samples contaminated with TNT. Results obtained from the SPME/IR determination of the diluted extracts were in reasonable agreement with those obtained from dichloromethane extraction followed by gas chromatographic analysis.
ISSN:0013-936X
1520-5851
DOI:10.1021/es010550c