Three new methods using titrimetric and spectrophotometry are described for the determination of Propranolol Hydrochloride (PPH) and Atenolol (AN) with potassium bromate as the oxidimetric reagent and acid dyes, Methyl orange and Indigo carmine. In direct titrimetric (method A), the drug is titrated directly with bromate in acid medium and in the presence of excess of bromide using methyl orang...

The EuII/III redox couple offers metal-based oxidation-sensing with magnetic resonance imaging making the study of EuII oxidation chemistry important in the design of new probes. Accordingly, we explored oxidation reactions with a set of EuII -containing complexes. Superoxide formation from the reaction between EuII and dioxygen was observed using electron paramagnetic resonance spectroscopy. A...

A new, simple and highly sensitive kinetic spectrophotometric method was developed for the determination of trace amounts of Ru(III) in the range of 0.06-20 ng/ml .The method is based on the inhibitory effect of ruthenium(III) on the oxidation of Rhodamine B by bromate in acidic and micellar medium. The reaction was monitored spectrophotometrically by measuring the decreasing in absorbance of R...

A novel simple, sensitive and rapid kinetic-spectrophotometric method for the determination of trace amounts of nitrite is proposed. The method is based on its catalytic effect on the oxidation of congo red (CR) by potassium bromate in acidic solution. The oxidation reaction is monitored spectrophotometrically by measuring the decrease in the absorbance of CR at a suitable λmax = 570 nm for the...

a highly sensitive differential pulse polarographic (dpp) method has been developed for the determination of trace amounts of osmium, based on the catalytic effect of osmium (viii) on the oxidation of pyrogallol red (pgr) by sodium bromate at ph 7.00 and 25.0 0.1 ? c. the reaction rate was monitored by measuring the differential pulse cathodic current of the oxidation product of pgr and bromate...

Supported Catalysis: To prepare an active Pd-catalyst for the bromate reduction reaction in water phase is necessary to use a mesoporous and positive surface charged support that favors reactants interaction with sites select metal precursor favours formation of homogeneous large Pd crystals.

Abstract The bromate–sulfite reaction-based pH-oscillators represent one of the most useful subgroup among chemical oscillators. They provide strong H + -pulses which can generate temporal oscillations in other systems coupled to them and they show wide variety spatiotemporal dynamics when are carried out different gel reactors. Some examples discussed. When pH-dependent physical processes link...

A highly sensitive differential pulse polarographic (DPP) method has been developed for the determination of trace amounts of osmium, based on the catalytic effect of osmium (VIII) on the oxidation of pyrogallol red (PGR) by sodium bromate at pH 7.00 and 25.0 0.1 ? C. The reaction rate was monitored by measuring the differential pulse cathodic current of the oxidation product of PGR and broma...

Bromate formation is a complex process that depends on the properties of water and ozone used. Due to fluctuations in quality, surface waters require major adjustments treatment process. In this work, we investigated how time year, dose duration, ammonium affect bromides, bromates, absorbance at 254 nm (UV254), near-infrared (NIR) spectra, fluorescent components (humic-like tyrosine-like) durin...