Abstract
Silica with immobilized polyethoxylated isooctylphenol groups (SiO 2 -TX) is studied as an adsorbent for the solid-phase extraction preconcentration of pesticides based on chlorophenoxyalkanecarboxylic acids from aqueous solutions. It is demonstrated that 2,4-dichlorophenoxyacetic acid (2,4-D) is efficiently (up to 96%) extracted as an ion associate with cetyltrimethylammonium bromide (CTMAB) with SiO2-TX in the pH range 8–10. The optimum CTMAB-to-2,4-D molar ratio is 200: 1. The capacity of SiO2-TX to 2,4-D in the Henry region is 0.42 mg/g of adsorbent, and the distribution coefficients reach 9 × 102 mL/g. It is shown that 2,4-D is quantitatively eluted with 1–2 mL of acetonitrile, which allowed us to use the adsorbent in a preconcentration cartridge before determining pesticides by HPLC. The procedure allowed pesticides to be recovered from aqueous solutions in concentrations beginning from 0.025 mg/L.
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Original Russian Text © V.A. Khalaf, V.O. Turchin, A.P. Grin’ko, V.N. Zaitsev, 2009, published in Zhurnal Analiticheskoi Khimii, 2009, Vol. 64, No. 2, pp. 124–129.
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Khalaf, V.A., Turchin, V.O., Grin’ko, A.P. et al. Solid-phase extraction preconcentration of 2,4-dichlorophenoxyacetic acid on silica with immobilized polyethoxylated isooctylphenol groups. J Anal Chem 64, 110–115 (2009). https://doi.org/10.1134/S1061934809020038
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DOI: https://doi.org/10.1134/S1061934809020038