J.C.Jiménez Sánchez

A new method for determining the composition and stability constant of complexes of the form ambn

Abstract A new method is reported for determining the composition of complexes of the form A m B n ; it can be used to differentiate mono- and polynuclear complexes. The method is based on that of Holme and Langmyhr. Good results were obtained for several complexes.

1,3-Cyclopentanedione bis(4-methylthiosemicarbazone) monohydrochloride as a spectrophotometric reagent for the determination of lodate in acetic and perchloric acid media

Abstract 1,3-Cyclopentanedione bis(4-methylthiosemicarbazone) monohydrochloride produces colored solutions with iodate ions in acid medium. The yellow color obtained has been used to proposed Spectrophotometric methods for determination of IO 3 − in the concentration range 1.0–11.0 ppm in acetic acid medium (molar absorptivity 1.08 × 10 4 liters mol −1 cm −1 at a wavelength of 415 nm) and 0.5–8.0 ppm in perchloric acid medium (molar absorptivity 2.05 × 10 4 liters mol −1 cm −1 at a wavelength of 400 nm).

Study of Cr(VI)-2-oximinodimedone dithiosemicarbazone reaction and simultaneous determination of Cr(VI) and Fe(III)

Summary2-Oximinodimedone dithiosemicarbazone reacts with Cr(VI) in strongly acid medium. The orange colour obtained has been used to propose a spectrophotometric method of Cr(VI) determination in the concentration range 0.40–9.5μg ml−1 (ε=5600 mole−1-cm−1 at 485 nm). The stoichiometry of the reaction is 3∶2 (reagent∶Cr(VI)) which is in accordance with the oxidation reaction of the reagent by Cr(VI). The method has been applied to the determination of Cr(VI) and Fe(III) in ceramic materials.Zusammenfassung2-Oximinodimedonedithiosemicarbazon reagiert in stark saurem Milieu mit Cr(VI). Die orange Farbe kann im Konzentrationsbereich von 0.4–9,5μg/ml zur spektrophotometrischen Cr(VI)-Bestimmung verwendet werden (ɛ=5600 1 mol−1cm−1bei 485 nm). Die Stöchiometrie der Reaktion ist 3∶2 (Reagens: Cr(VI)) und entspricht der Oxidation des Reagens durch Cr(VI). Die Methode wurde zur Bestimmung von Cr(VI) und Fe(III) in keramischen Materialien eingesetzt.

Cyclopentane-1,3-dione bis (4-methylthiosemicarbazone) monohydrochloride as a spectrophotometric reagent for the determination of bromate in perchloric acid medium

Abstract Cyclopentane-1,3-dione bis (4-methylthiosemicarbazone) monohydrochloride produces coloured solutions with bromate ions in perchloric acid medium. The yellow colour obtained (molar absorptivity 1.8×104 1.mol−1.cm−1 at a wavelength of 400 mm) has been used for the spectrophotometric determination of trace amounts of bromate.

Some observations on the use of 2-oximinodimedone dithiosemicarbazone as a spectrophotometric reagent for the determination of lodate and bromate

Abstract 2-Oximinodimedone dithiosemicarbazone produces colored solutions with iodate and bromate ions in strongly acid medium. The yellow color obtained has been used to develop spectrophotometric methods for iodate and bromate in the concentration range 0.24–5.00 μg · ml−1 of iodate and 0.16–3.60 μg · ml−1 of bromate (λ 400 nm).

Analytical properties of 2-oximinodimedone dithiosemicarbazone

The synthesis and analytical properties of 2-oximinodimedone dithiosemicarbazone are described.

1,3-Cyclohexanedione bis(4-methylthiosemicarbazone) monohydrochloride as analytical reagent for spectrophotometric estimation of nitrite

Abstract The properties and analytical possibilities of 1,3-cyclohexanedione bis(4-methylthiosemicarbazone) monohydrochloride as spectrophotometric reagent have been examined. A new method for determining nitrite has been developed.

Kinetic determination of copper(II) by its catalytic effect on the atmospheric oxidation of 1,3-cyclopentanedione bis(4-methylthiosemicarbazone) monohydrochloride

Abstract The kinetic method is based on the catalytic effect of copper(II) on the atmospheric oxidation of 1,3-cyclopentanedione bis(4-methylthiosemicarbazone) monohydrochloride. The reaction is followed spectrophotometrically at 390 nm. The kinetic parameters of the reaction are reported and a rate equation is suggested. The calibration graphs are linear in the range 0.05–0.5 μg Cu ml−1. Interference by other ions is studied.

Cyclopentane-1,3-dione bis(4-methylthiosemicarbazone) monohydrochloride as a spectrophotometric reagent for the determination of chlorate in perchloric acid medium

Abstract 1,3-Cyclopentanedione bis(4-methylthiosemicarbazone) monohydrochloride produces colored solutions with chlorate ions in strongly acid medium. The yellow color obtained has been used to propose a spectrophotometric method of C10 3 − determination in the concentration range 0.5–6.0 ppm (molar absorptivity 1.26 × 10 4 liters mol −1 cm −1 at a wavelength of 397 nm).

Spectrophotometric determination of iron with 2-oximinodimedone dithiosemicarbazone

Abstract 2-Oximinodimedone dithiosemicarbazone produces a violet complex with Fe(II) in strongly acid medium (molar absorptivity 9800 liters · mol −1 · cm −1 at 565 nm). The violet complex was used for the Spectrophotometric determination of Fe(II) (determination limit 0.20 μg · ml −1 in homogeneous medium and 0.022 μg · ml −1 by extraction with isoamyl alcohol. The methods were applied to the determination of iron in wines, foods, minerals, and water.