Application of modified silica (SiO2–TX) for recovery of acidic herbicides

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Key words: 

chlorophenoxyalkanecarboxylic acids, 2,4-D, Dicamba, MCPA, pesticide, cetyltrimethylammonium bromide, polyethoxylated isooctylphenol, HPLC, SPE.


This article deals with a new material for the sorption of acidic compounds from water environments. Silica with immobilized polyethoxylated isooctylphenol groups (SiO2-TX) was tested as a sorbent for the solid-phase extraction (SPE) of chlorophenoxyalkanecarboxylic acids (CPACAs).  It was found that SiO2-TX sorbent yields better recoveries than SiO2-C18. In order to validate the SPE method natural aqueous samples were used. Linearity was found in a range of 0.025 to 0.4 mg·L−1 and detection limits were between 0.07 and 0.085 mg·L−1. Recoveries were 78–92%, and RSD no more than 1–5%. 

Valentina TURCHIN, Alla GRIN’KO  Ministry of Health, State Enterprise  L.I. Medved's Research Center of Preventive Toxicology and Chemical Safety State Enterprise, 6 Heroiv Oborony st., Kyiv, 03680,Ukraine. 
Viktoria RAKS  Taras Shevchenko National

University of Kyiv Analytical Chemistry Department Vоlоdymyrska 46, Kyiv, 01033, Ukraine 

Kyiv National University of Technologies and Design Nemyrovych-Danchenko 2, Kyiv, 01011, Ukraine 


Kazimierz Pulaski University of Technology and Humanities in Radom

Department of Material Science, Technology and Design

ul. Chrobrego 27, 26-600 Radom, Poland