METHODS AND OBJECTS OF CHEMICAL ANALYSIS ISSN title: "Metody i obʺekty himičeskogo analiza" An international journal devoted to all aspects of Analytical chemistry ISSN 2413-6166 (Online), ISSN 1991-0290 (Print)
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Determination of 2,4 dichlorophenoxy acetic acid in aqueous environmental samples

Khalaf V.A., Turchin V.O., Zaitsev V.N.

The present study describes the application of new solid phase extraction (SPE) techniques for the preconcentration of 2,4,dichlorophenoxyacetic acid (2,4,D) in the aqueous environment with following separation and quantification by high performance liquid chromatography with an ultraviolet detector. Silica with immobilized polyoxyethylated isooctylphenol (SiO2,TX) was used as an adsorbent for SPE of chlorophenoxy acid pesticides. Under optimum recovery conditions of 2,4,D (pH = 8,8; ν = 1,5 ml/min; molar excess of cetyltrimethylammonium bromide to 2,4,D is 200:1) and concentration factor 50 the detection limit of 2,4,D was 0,07 g/mL (0,33 μmol/L) with linear concentration range from 0,09 to 0,20 g/mL (from 0,45 to 0,91 μmol/L).

Keywords: 4,dichlorophenoxyacetic acid (2,4,D), herbicide, HPLC, SPE, silica