Solid-phase extraction for the simultaneous preconcentration of organic (selenocystine) and inorganic [Se(IV), Se(VI)] selenium in natural waters

2002 ◽  
Vol 963 (1-2) ◽  
pp. 185-193 ◽  
Author(s):  
Maı̈té Bueno ◽  
Martine Potin-Gautier
Keyword(s):  
Solid Phase Extraction ◽  
Natural Waters ◽  
Solid Phase ◽  
Phase Extraction

Isolation and Quantification of Dissolved Lignin from Natural Waters Using Solid-Phase Extraction and GC/MS

2000 ◽  
Vol 72 (13) ◽  
pp. 2780-2787 ◽  
Author(s):  
Patrick Louchouarn ◽  
Steve Opsahl ◽  
Ronald Benner
Keyword(s):  
Solid Phase Extraction ◽  
Natural Waters ◽  
Solid Phase ◽  
Phase Extraction

scholarly journals Simple and Fast Methods Based on Solid-Phase Extraction Coupled to Liquid Chromatography with UV Detection for the Monitoring of Caffeine in Natural, and Wastewater as Marker of Anthropogenic Impact

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
Sònia Moret ◽  
Manuela Hidalgo ◽  
Juan M. Sanchez
Keyword(s):  
Detection Limit ◽  
Solid Phase Extraction ◽  
Natural Waters ◽  
Wastewater Treatment Plants ◽  
Solid Phase ◽  
Sample Volume ◽  
Uv Detection ◽  
Phase Extraction ◽  
Method Detection Limit ◽  
Spe Method

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.

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