Cationic amine-bridged periodic mesoporous organosilica materials for off-line solid-phase extraction of phenoxy acid herbicides from water samples prior to their simultaneous enantiomeric determination by capillary electrophoresis

2018 ◽  
Vol 1566 ◽  
pp. 146-157 ◽  
Author(s):  
Jesús Valimaña-Traverso ◽  
Sonia Morante-Zarcero ◽  
Damián Pérez-Quintanilla ◽  
María Ángeles García ◽  
Isabel Sierra ◽  
...  
Keyword(s):  
Capillary Electrophoresis ◽  
Solid Phase Extraction ◽  
Water Samples ◽  
Solid Phase ◽  
Phase Extraction ◽  
Periodic Mesoporous Organosilica ◽  
Mesoporous Organosilica ◽  
Phenoxy Acid Herbicides ◽  
Acid Herbicides ◽  
Organosilica Materials

Liquid Chromatographic Screening Method for Fluorescent Derivatives of Chlorophenoxy Acid Herbicides in Water

1992 ◽  
Vol 75 (4) ◽  
pp. 720-724 ◽  
Author(s):  
Toshinari Suzuki ◽  
Satoru Watanabe
Keyword(s):  
Solid Phase Extraction ◽  
Water Samples ◽  
Solid Phase ◽  
Screening Method ◽  
Ethyl Esters ◽  
Separate Determination ◽  
Phase Extraction ◽  
Liquid Chromatographic ◽  
Acid Herbicides

Abstract A liquid chromatographic method for screening 9 chlorophenoxy acids (2,4-D; 2,4-DP; 2,4-DB; MCPA; MCPP; MCPB; 2,4,5-T; 2,4,5-TP; and 2,4,5-TB) and their ethyl esters in ground- and tap water is presented. The water samples are acidified and subjected to either liquid-liquid or solid-phase extraction. The extracts obtained are saponified in 0.03N NaOH-50% methanol (1+1) and the acidic compounds are re-extracted with ethyl acetate-n-hexane (8 + 2) after acidification and derivatized with 9- anthryldiazomethane. Derivatized compounds are analyzed using reversed-phase column chromatography with fluorescence detection (excitation, 365 nm; emission, 412 nm). Recoveries of analytes from 20 mL water samples were greater than 90%, and the average coefficient of variation was within 5.0% at 0.5 ppb for both extraction methods. These methods are simple and useful for the determination of small amounts of chlorophenoxy herbicides. Solid-phase extraction is suitable for screening a large number of samples simultaneously, and liquid extraction for separate determination of the acids and ethyl esters of the herbicides was improved by introducing a saponification step.

Evaluation of phenylene-bridged periodic mesoporous organosilica as a stationary phase for solid phase extraction

2014 ◽  
Vol 1370 ◽  
pp. 25-32 ◽  
Author(s):  
A. Carpio ◽  
D. Esquivel ◽  
L. Arce ◽  
F.J. Romero-Salguero ◽  
P. Van Der Voort ◽  
...  
Keyword(s):  
Solid Phase Extraction ◽  
Stationary Phase ◽  
Solid Phase ◽  
Phase Extraction ◽  
Periodic Mesoporous Organosilica ◽  
Mesoporous Organosilica

Determination of sulfonamide residues in water samples by in-line solid-phase extraction-capillary electrophoresis

2009 ◽  
Vol 1216 (15) ◽  
pp. 3372-3379 ◽  
Author(s):  
Francisco J. Lara ◽  
Ana M. García-Campaña ◽  
Christian Neusüss ◽  
Fermín Alés-Barrero
Keyword(s):  
Capillary Electrophoresis ◽  
Solid Phase Extraction ◽  
Water Samples ◽  
Solid Phase ◽  
Phase Extraction ◽  
Sulfonamide Residues
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