SOLID-PHASE EXTRACTION OF CHLOROPHENOXY ACID HERBICIDES BY MEANS OF POLYMERIC RESINS FUNCTIONALIZED WITH QUATERNARY AMMONIUM GROUPS

2002 ◽  
Vol 25 (3) ◽  
pp. 445-461 ◽  
Author(s):  
S. Menor-Higueruelo ◽  
L. V. Pérez-Arribas ◽  
M. E. León-González ◽  
L. M. Polo-Díez
Keyword(s):  
Solid Phase Extraction ◽  
Quaternary Ammonium ◽  
Solid Phase ◽  
Phase Extraction ◽  
Polymeric Resins ◽  
Chlorophenoxy Acid Herbicides ◽  
Acid Herbicides

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.

scholarly journals Quaternary ammonium-functionalized silica sorbents for the solid-phase extraction of aromatic amines under normal phase conditions

2013 ◽  
Vol 1285 ◽  
pp. 7-14 ◽  
Author(s):  
Lorena Vidal ◽  
Orlane Robin ◽  
Jevgeni Parshintsev ◽  
Jyri-Pekka Mikkola ◽  
Marja-Liisa Riekkola
Keyword(s):  
Solid Phase Extraction ◽  
Quaternary Ammonium ◽  
Aromatic Amines ◽  
Solid Phase ◽  
Normal Phase ◽  
Phase Extraction ◽  
Functionalized Silica
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