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Journal Articles Journal of Electroanalytical Chemistry Year : 2020

Ametryn detection by proton assisted transfer at a single micro-interface between two immiscible electrolyte solutions

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Abstract

Ion transfer at micro-interfaces formed between two immiscible electrolyte solutions (µITIES) is a powerful platform for the detection of charged species. Ametryn is used as a model target analyte to investigate the detection at µITIES of lipophilic and ionisable herbicides derived from triazine. A twostep detection method is proposed, which is taking advantage of the spontaneous partition of triazine derivatives at open-circuit potential, and of their ability to assist proton transfer across the interface. First, the neutral form of ametryn is accumulated in a small volume of organic phase (Vorg = 50 µL) at open-circuit potential, which leads to its preconcentration (Vaq >> Vorg). In a second step, AC voltammetry was run to allow the limit of detection to reach sub-micromolar levels of ametryn in 3 river samples. Phosphate buffer was added to the real samples to provide a constant supply of proton for ametryn detection. The excess of buffer ensured that the analytical response was proportional to the ametryn concentration.
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Dates and versions

hal-02961394 , version 1 (01-12-2020)

Licence

Attribution - CC BY 4.0

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Guofeng Lu, Christelle Despas, Liang Liu, Grégoire Herzog. Ametryn detection by proton assisted transfer at a single micro-interface between two immiscible electrolyte solutions. Journal of Electroanalytical Chemistry, 2020, 877, pp.114745. ⟨10.1016/j.jelechem.2020.114745⟩. ⟨hal-02961394⟩
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