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Voltammetric approach for a sensitive determination of plant growth stimulator 1-naphthaleneacetic acid employing boron-doped diamond as a sensor

Rok: 2019

Druh publikace: ostatní - článek ve sborníku

Strana od-do: nestránkováno

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Jazyk	Název	Abstrakt	Klíčová slova
eng	Voltammetric approach for a sensitive determination of plant growth stimulator 1-naphthaleneacetic acid employing boron-doped diamond as a sensor	1-Naphthaleneacetic acid (NAA) or its sodium salt (NAANa) are often applied for plant growth stimulation, mainly for rooting of plants. They are used alone or in mixture with other auxins. Voltammetric approaches aiming to determination of NAA are described mainly on modified carbon electrodes e.g. [1-3]. In the present paper, we focused, for the first time, on monitoring of electrochemical oxidation of NAA in ethanolic acidic media (0.6 M H2SO4) employing boron-doped diamond electrode (BDDE) as a stable and sensitive sensor, which does not need any complicated pretreatment or preparation. Moreover, the recorded process undergoes about relatively high positive potentials and two anodic peaks about +1405 and 1595 mV, respectively, can be recorded on BDDE due to its wide potential window. Conditions of differential pulse voltammetry (DPV) were optimized and it was reached low limit of quantification (LOQ = 0.445 μg mL−1). The proposed voltammetric approach does not required high cost instrumentation and it was evaluated as time saving, reliable and sensitive. Besides possible voltammetric determination, reaction mechanism of the followed anodic reaction was examined as well and it is displayed in Fig. 1. It was found out that the first oxidation step included creation of relevant alcohol (2) and aldehyde (3) as well and the second oxidation step could be described as oxidation of the aldehyde and creation of insoluble polymeric products of NAA.

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