Development of a New Method for Determination of Hydrazine Based onModified Screen Printed Electrode

IntroductionHydrazine is a toxic agent numerated as a pollutant of environment and biologic systems and in another hand is one of the most used compound in industries which is used to remove oxygen in cycle, create passive layer and also increase the alkalinity of vapor phase so, determination of thisreagent is very important due to its effects on human body and environment. This reagent absorbed by skin and lung which cause irritation, liver disease and neurotic damages [1]. Therefore introducing a selective and sensitive method for accurate determination of hydrazine is crucial.Recently, electrochemical techniques have been applied to determine hydrazine because they offer an opportunity for portable, rapid and cheap methodologies [2,3].Purpose of research The aim of this work is development of people health and enhancement of the determination precision of hydrazine based on new a method using electrochemical reaction on the surface of multiwall carbon nanotube screen printed electrode modified with an imidazole derivative 5(1Hbenzo[d]imidazol-2-ylthio)-3-methoxybenzene-1,2-diol(Im/MWCNT-SPE).The electrocatalytic oxidation of hydrazine on a (Im/MWCNT-SPE) has been studied. The (Im/MWCNT-SPE) shows highly catalytic activity toward hydrazine electrooxidation. The results indicated that hydrazine peak potential at (Im/MWCNT−SPE) shifted for 172 mV and 127 mV to negative values as compared with activated and multiwall carbon nanotube modified screen printed electrode surface. Fig.1 shows the electrocatalytic effect of (Im/MWCNT-SPE) toward oxidation of hydrazine. The kinetic parameters, such as the electron transfer coefficient, α, and the standardheterogeneous rate constant, k , for oxidation of hydrazine at the (Im/MWCNT-SPE) were determined as 0.29 and 1.07× 10-3 cms-1. The differential pulse voltammetric detection of hydrazine was carried out in a 0.1 mol L-1 phosphate buffer solution (pH 7.0) resulting in tree linear responseranges of 1.8 to 45.6 nM and 45.6 to 148.1 nM and 148.1 to 2285.7 nm and the detection limit of0.55 nM.ConclusionThe (Im/MWCNT−SPE) can decrease the oxidation peak potentials of Hydrazine for about 172 mV and 127 mV on the surface of (Im/MWCNT-SPE) toward activated and modified electrode with multiwall carbon nanotube therefore, determination of the analyte (Hydrazine) is possible withoutany interference. Moreover, the (Im/MWCNT−SPE) was used to determine hydrazine in real samples with satisfactory results.

کلیدواژه ها:

Multiwall Carbon Nano Tube ، Imidazole Derivative ، Hydrazine ، Screen printedelectrode