title: Study of the voltammetric behaviour of maleic hydrazide and its determination at a hanging mercury drop electrode.
abstract: Voltammetric behaviour of maleic hydrazide pesticide dissolved in a Britton-Robertson buffer was investigated by cyclic voltammetry (CV) and differential pulse voltammetry (DPV). It was found that the process at the Hg electrode was diffusion controlled; the reaction was irreversible and involved a change of one proton and a transfer of one electron. A quantitative differential pulse voltammetric method for determination of maleic hydrazide was developed on the basis of these studies involving the reduction of the compound at a hanging mercury drop electrode. A linear calibration was obtained in the range of 0.5-5.5mgl(-1), and the developed DPV methodology was then applied for the determination of maleic hydrazide in spiked vegetable samples by the standard addition method. Satisfactory percentage R.S.D. ( approximately 2%), percentage recovery values ( approximately 85%) and LOD (0.215mgl(-1)) were obtained. These compared well with the results from the alternative spectrophotometric method.
authors.affiliation: Department of Chemistry, Nanchang University, Nanchang, Jiangxi 330047, China.
authors.forename: Yongnian
authors.initials: Y
authors.lastname: Ni
authors.forename: Ping
authors.initials: P
authors.lastname: Qiu
authors.forename: Serge
authors.initials: S
authors.lastname: Kokot