Journal
SCIENCE OF THE TOTAL ENVIRONMENT
Volume 450, Issue -, Pages 1-6Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.scitotenv.2013.02.006
Keywords
Gas chromatography; Time-of-flight mass spectrometry; Accurate mass; Non-target analysis; Post-target analysis; Urban environment
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Funding
- Helsinki University Centre for Environment (HENVI), Ramboll Finland Oy
- Finnish Doctoral Programme in Environmental Science and Technology
- Onni and Hilja Tuovinen Foundation
- Finnish Water Services Development Fund
- Lake Vesijarvi Foundation
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Qualitative non-target and post-target analysis methods using gas chromatography-time-of-flight mass spectrometry were applied for analysing neutral and acidic organic xenobiotics in urban and suburban water samples. Ten water samples representing wastewater, stormwater and surface water matrices were collected and concentrated using solid phase extraction. Compound identification was performed using a spectral deconvolution program, accurate mass measurements and comparisons with library spectra. The non-target and post-target analyses identified 36 and 18 compounds, respectively. The identification of 10 compounds was afterwards confirmed with standard compounds. Organophosphate esters were the most abundant compound group detected. The combination of non-target and post-target analyses proved a useful tool in the tentative identification of xenobiotics in water samples. Post-target analysis can complement non-target analysis results at low analyte concentrations. Results showed that several organic xenobiotics originate in urban areas and accumulate in the environment. The wastewater sample produced the highest number of identified compounds, but most of these compounds were also found in stormwater samples from the city centre. Nearly all the compounds present in wastewater were additionally detected in the surface water sample taken 3 km downstream from the wastewater effluent discharge point. Only a few xenobiotics were otherwise detected in the surface water samples. (C) 2013 Elsevier B.V. All rights reserved.
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