Títol:
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Simple and fast methods based on solid-phase extraction coupled to liquid chromatography with UV detection for the monitoring of caffeine in natural and waste waters as marker of anthropogenic impact
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Autor/a:
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Moret Solà, Sònia; Hidalgo Muñoz, Manuela; Sánchez Navarro, Juan Manuel
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Abstract:
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Two concentration methods for fast and routine determination of caffeine (using HPLC-UV detection) in surface, and wastewater are evaluated. Both methods are based on solid-phase extraction (SPE) concentration with octadecyl silica sorbents. A common “offline” SPE procedure shows that quantitative recovery of caffeine is obtained with 2 mL of an elution mixture solvent methanol-water containing at least 60% methanol. The method detection limit is 0.1 μg L−1 when percolating 1 L samples through the cartridge. The development of an “online” SPE method based on a mini-SPE column, containing 100 mg of the same sorbent, directly connected to the HPLC system allows the method detection limit to be decreased to 10 ng L−1 with a sample volume of 100 mL. The “offline” SPE method is applied to the analysis of caffeine in wastewater samples, whereas the “on-line” method is used for analysis in natural waters from streams receiving significant water intakes from local wastewater treatment plants |
Data de publicació:
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07-10-2013 |
Matèries:
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-Cafeïna -Caffeine -Aigua -- Contaminació -Water pollution -Cromatografia de líquids -Liquid chromatography -Extracció (Química) |
Drets:
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Attribution 3.0 Spain
http://creativecommons.org/licenses/by/3.0/es/ |
Tipus de document:
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Article Article - Versió publicada |
Publicat per:
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Hindawi Publishing Corporation
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