an extraction-spectrophotometric method for the determination of trace amounts of ammonium ion is described. ammonium ion is effectively extracted as a neutral ternary complex nh . db 18c6. calmagite at ph 3.0 into chloroform, followed by spectrophotometric determination at =48 5 nm. molar absorptivity of the ternary complex at this wavelength is 1.08 10 mol cm . beer's law is obeyed over ...

Four precise, accurate, selective, and sensitive UV-spectrophotometric methods were developed and validated for the simultaneous determination of a binary mixture of Oxytetracycline HCl (OXY) and Flunixin Meglumine (FLU). The first method, dual wavelength (DW), depends on measuring the difference in absorbance (ΔA 273.4-327 nm) for the determination of OXY where FLU is zero while FLU is determi...

Reversed-phase HPLC and UV spectrophotometric techniques using water as solvent have been developed and validated for the simultaneous determination of amoxicillin and cloxacillin in capsules. For both techniques, the linearity range of 60.073x2013;140.0 µg/mL was studied. The spectrophotometric data show that non-derivative techniques, such as absorbance ratio and compensation, and ratio spect...

a spectrophotometric method for selective complexation reaction and simultaneous determination of mycophenolate mofetil (mpm), and mycophenolic acid (mpa) using three multivariate chemometric methods, i.e. partial least squares regression, principal component regression and principal component artificial neural networks, is proposed. the method is based on the complexation reaction of mpm and m...

Recently solution scanometry, as a new, simple, fast, portable, and economic method was introduced for determination of acidity constants of indicator and dyes. In this study, a method was applied for the determination of the acidity constant of p-Rosolic acid (RA) and Bromoxylenol blue (BXB) indicators. The method is based on scanning of Plexiglas® sheet containing colored solutions with a fla...

Anew, highly sensitive and selective catalytic kinetic method (CKM) for determination of osmium (VIII) has been established based on its catalytic effect on the oxidation of thionine dye by hydrogen peroxide in alkaline medium. The reaction has been followed spectrophotometrically by measuring the decrease in the absorbance band of thionine at 600 nm. Under the optimum conditions, the proposed ...

Firstand second-order derivative spectrophotometric methods for the quantitative determination by converting menadione sodium bisulphite (MSB) to menadione (M ) with sodium carbonate were developed and validated in pharmaceutical preparation. The quantitative determination of MSB was carried out by using wavelengths 350 nm (for first-order; 1D) and 355 nm (for second-order; 2D) with the lineari...

A simple, precise economical and fast visible spectrophotometric method has been developed for the determination of Itopride hydrochloride in tablet dosage form. Developed is based on formation of extractable colored complex of drug with coloring agent mordant blue 3. A wavelength maximum was found to 471.0 nm. Linearity was observed 30-70 mg /mL. The proposed method describes the determination...

A validate rapid, economical and sensitive visible spectrophotometric method has been developed for quantitative determination of amprenavir in bulk drug and formulation samples. This method is validated for irinotecan with chromogenic reagent 3-methyl benzothiazolinone hydrazine (MBTH). The calibration curve was linear over Beer’s concentration range of 25-350 μg/ml. The relative standard devi...

First-ever three spectrophotometric methods using sulfanilamide (SAA), sulfadoxine (SDX) and sulfamethoxazole (SMX), the widely used sulfa drugs as new class of coupling agents for the spectrophotometric determination of cardol, a phenolic compound found in cashew nut shell liquid, a by-product of cashew industry is proposed. The methods are based on the interaction of diazotized sulfa drugs wi...