Sensitive and simple detection of trace hydrogen peroxide based on a resonance light scattering assay

A new method for the resonance light scattering determination of hydrogen peroxide has been developed, and the optimum reaction conditions, influential factors and applications were investigated.

Download Full-text

Kinetic spectrophotometric determination of Co(II) ion by the oxidation of ponceau 4R by hydrogen peroxide

Journal of the Serbian Chemical Society ◽

10.2298/jsc0602189g ◽

2006 ◽

Vol 71 (2) ◽

pp. 189-196 ◽

Cited By ~ 3

Author(s):

Zora Grahovac ◽

Snezana Mitic ◽

Emilija Pecev ◽

Snezana Tosic

Keyword(s):

Hydrogen Peroxide ◽

Kinetic Method ◽

Calibration Graph ◽

Borate Buffer ◽

Linear Calibration ◽

Reaction Conditions ◽

Ponceau 4R ◽

Optimum Reaction ◽

Kinetic Spectrophotometric

Anew, sensitive and simple kinetic method has been developed for the determination of traces of Co(II) ions based on their catalytic effect in the oxidation of trisodium-2-hydroxy-1-(4-sulphonato-1-naphthylazo)naphthalene-6,8-disulphonate (red artificial color Ponceau 4R) by hydrogen peroxide in borate buffer. The reaction was followed spectrophotometrically by tracing the oxidation product at 478.4 nm within 1 min after the initiation of the reaction. The optimum reaction conditions are: borate buffer (pH 10.50), Ponceau 4R (8 x10-6 mol/dm3), H2O2 (3 x10-2 mol/dm3) at 22 ?C. Following this procedure, Co(II) can be determined with a linear calibration graph up to 1.17 ng/cm3 and a detection limit of 0.20, based on the 3??criterion. The relative error ranges between 4.80-3.25 % for the concentration interval of Co(II) ions 1.76-17.61 ng/cm3. The effects of certain foreign ions on the reaction rate were determined for an assessment of the selectivity of the method. The method was applied for the determination of Co(II) in pharmaceutical samples.

Download Full-text

Study of the Catalytic Effects of Trace Titanium on Oxidation of Pyronin B with Hydrogen Peroxide and its Application

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.602-604.1233 ◽

2012 ◽

Vol 602-604 ◽

pp. 1233-1237

Author(s):

Zhi Rong Zhou ◽

Li Zhen Zhang

Keyword(s):

Hydrogen Peroxide ◽

Reaction Medium ◽

Reaction Conditions ◽

Relative Standard ◽

Extraction Separation ◽

Optimum Reaction ◽

Kinetic Spectrophotometric ◽

Replicate Measurements ◽

Catalytic Effects

A simple and sensitive kinetic spectrophotometric method for the determination of trace amounts titanium (IV), based on the catalytic effect of Ti (IV) on the oxidation pyronin B with hydrogen peroxide in 0.02 mol/L sulfuric acid, is described. The reaction rate is monitored spectrophotometrically by measuring the decrease in absorbance of pyronin B at 555 nm. The detection limit of the method is 0.017 μg/L, and the linear range is 0.055–1.0 µg/L. The influences of reaction medium and acidity, concentrations of reactants, reactive temperature and foreign ions is also discussed. The optimum reaction conditions were established. The relative standard deviation for 11 replicate measurements of 0.010 and 0.020 μg/25mL of titanium (IV) were 2.8 % and 2.3 %, respectively. In combination with solvent extraction separation, the method has been successfully applied to the determination of trace titanium (IV) in rock samples. The results are in good agreement with the certified volumes with the relative standard deviations (RSD) of 1.6 %–3.6 %.

Download Full-text