Spectrophotometric determination of iron (III) with Pyrocatechol Violet

[Improved spectrophotometric determination of total iron and iron(III) with o-hydroxyhydroquinonephthalein and their characterization].

Simultaneous and fractional determination of iron(II) and iron(III) was accomplished with o-hydroxyhydroquinonephthalein (QP) in the presence of poly (N-vinyl pyrrolidone). In the determination of total iron (iron(II)+iron(III)), Beer's law was obeyed in the range of 0.02-0.67 μg·ml(-1), with an effective molar absorptivity (at 570 nm) and a relative standard deviation of 1.30×10(5)·l·mol(-1)·c...

Spectrophotometric determination of gallium(III) with rutin.

Spectrophotometric Determination of Nickel with Chlorophosphonazo-III

The optimum conditions for spectrophotometric method for the determination of Ni with chlorophosphonazo-III (CPA-III) were established and the nickel content in water samples has been successfully determined. In a pH 5.5 acetic acid-sodium acetate buffer medium, CPA-III and Ni formed a 1:3 green blue complex and the maximum absorption wavelength of the complex is at 620 nm. Ni content in a rang...

Complexation equilibria and spectrophotometric determination of iron(III) with resorcylic acid.

The complexation equilibria of Fe(III) with resorcylic acid (2,4-dihydroxybenzoic acid, DHB) were studied spectrophotometrically in ethanol-water (4 + 6, v/v) at an ionic strength of 0.1 M NaClO4. The complexation reactions were demonstrated and characterized. A simple, rapid, and sensitive method based on the formation of the Fe(III)-DHB complex at pH 2.5 (lambdamax = 520 nm, epsilon = 0.8 x 1...

Tetrazolium violet – a new spectrophotometric reagent for molybdenum determination

* corresponding author. e-mail: [email protected] The interaction of Mo(VI) and tetrazolium violet (TV) has been examined. The ion-associate formed is extracted into 1,2-dichloroethane. The tetrazolium violet : molybdenum(VI) : 3,4,5-trihydroxybenzoic acid ratio (R) is 2 : 1 : 2. The optimum conditions have been established. Beer’s law is obeyed in the range of 0.2–5 μg ml–1 molybdenum(VI...