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

Key words: 

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

Summary

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 
 
Natalia BEREZNENKO Sergey BEREZNENKO 

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

 Maria PAWLOWA

Kazimierz Pulaski University of Technology and Humanities in Radom

Department of Material Science, Technology and Design

ul. Chrobrego 27, 26-600 Radom, Poland