conclusions the results of this study show that lh in different pharmaceutical preparations could be determined with good reliability. in addition, the results reveal that the equal numbers of electrons and protons are involved in the oxidation of lh and the irreversible oxidation of an analyte was performed via amine groups of lh molecule. background lidocaine hydrochloride (lh) is one of the ...

The construction and electrochemical response characteristics of a poly(vinyl chloride) (PVC) membrane selective electrode for the determination of tiapride (TPD) are described. The sensing membrane comprised an ion-pair formed between the protonated drug and tetraphenylborate (TPB) in a plasticized PVC matrix. The influence of membrane composition on the electrode response was studied. The ele...

in the present study, a new chemically modified carbon paste electrode (cpe) is constructed for rapid, accurate, simple, highly sensitive, and selective determination of mo (vi) using differential pulse voltammetry. the electrode was prepared using magnetic nickel zinc ferrite nanocomposite (ni0.5zn0.5fe2o4), as the modifier in cpe (ni0.5zn0.5fe2o4/cpe). mo (vi) was determined after preconcentr...

A new method of indirect determination of Cu(2+) was developed based on square-wave voltammetry by the oxidation of iodide in organic solvent at the liquid/liquid (L/L) interface. The limit of detection for the determination of Cu(2+) in this method was found to be 5 x 10(-4) mol/L, and the concentration ranged up to 1 x 10(-2) mol/L gave a linear limiting current versus concentration response....

Formaldehyde in small quantities is commonly analyzed by spectrophotometric methods. One of the most-commonly used spectrophotometric techniques for this purpose is based on the reaction with chromotropic acid. Because of its simplicity, sensitivity, selectivity and its low cost, it is still widely used. Investigations for replacing the concentrated sulfuric acid with other acids or using more ...

A spectrofluorometric method is described for the determination of germanium(IV) based on its complexation reaction with quercetin in presence of Brij-35. The fluorescence is monitored at 552 nm with excitation at 432 nm. The pH, quercetin and Brij-35 concentrations were optimized simultaneously using the response surface methodology from sequential experimental three-variable Doehlert designs....

in this work, a novel electrochemical technique is presented for determination of bentazonusing a nanocomposite based sensor and continuous coulometric fast fourier transformation cyclicvoltammetry (ccfftcv). in this method, the sensor response is in coulomb and is calculated based onintegrating charge changes under the current voltammogram in selected potential range. the new sensor wasconstru...