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At least 217 records · Page 12Linked to original sources
PubMed2002

[Kinetic spectrophotometric determination of vanadium in steel samples with indigo carmine and potassium bromate redox system].

A sensitive and selective kinetic spectrophotometric method for the determination of trace vanadium at room temperature (25 degrees C) was developed, based on its catalytic effect on the oxidation of indigo carmine with potassium bromate in 1.0 mol.L-1 phosphoric acid medium. The linear calibration range and detection limit are 0.02-1.0 microgram.mL-1 and 0.02 microgram.mL-1, respectively. The apparent activation energy of the quasi-zero-order catalytic reaction is 50.6 kJ.mol-1. The method is simple and rapid. In the presence of NaF, most of the common ions did not interfere to the determination of vanadium. The method was applied to the direct determination of vanadium in steel samples with satisfactory results.

English Abstract↗
PubMed1993

A possible role for cell proliferation in potassium bromate (KBrO3) carcinogenesis.

Accumulation of alpha 2u-globulin and induction of cell proliferation were examined in kidneys of rats exposed to KBrO3, KBr or NaBrO3 in their drinking water. Hyaline droplets observed after KBrO3 or NaBrO3 administration to male rats were specifically immunostained for alpha 2u-globulin. Increases in cell proliferation were found in the proximal tubules of male rats given KBrO3 or NaBrO3 but not KBr for 2, 4, and 8 weeks. No such change was evident in KBrO3-treated female rats or the distal tubules of any treated animal. The concordance between hyaline droplet accumulation and increased cell turnover suggests that KBrO3- and NaBrO3-induced cell replication in kidneys of male rats may result from alpha 2u-globulin nephropathy. Considering the fact that KBrO3 has genotoxic potential involving oxidative stress, we hypothesize that the induced cell proliferation might predominantly play an additive role in its carcinogenesis. Furthermore, the present data, showing similar effects of NaBrO3 on the rat kidney, are of direct significance to its risk assessment.

Alpha-Globulins↗
PubMed1989

Bromate poisoning.

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Acute Kidney Injury↗
PubMed1997

An ion chromatographic method for measuring < 5 micrograms/L bromate ion in drinking water.

Many laboratories using the best available technology (ion chromatography) can only reliably measure BrO3- at the 10-20 micrograms/L level. Typically, BrO3- peak resolution is not a problem; however, finished water can contain appreciable amounts of Cl- that can interfere with BrO3- measurement using conductivity detection. Chlorpromazine is a selective reagent that does not react with Cl- and is an ideal postcolumn detection chemistry following IC separation. The chlorpromazine postcolumn method is linear over the 0.5-100 micrograms/L range.

Bromates↗
PubMed2003

Design of a photocatalyst for bromate decomposition: surface modification of TiO2 by pseudo-boehmite.

The rate of BrO3- reduction by a commercial TiO2 photocatalyst under UV illumination in an aqueous solution was increased by lowering the pH from 7 to 5. The effect is attributable to an enhancement of the electrical interaction between BrO3- and the positively charged surfaces of the TiO2 photocatalyst. The surface charge can be controlled by a surface modification of the TiO2 photocatalyst without controlling the pH of the water. In fact, the isoelectric point of surface-modified TiO2 was higher than that of the unloaded TiO2 photocatalyst, resulting in an increase in the rate of the photocatalytic reduction of BrO3- at a neutral pH. This increase is explained by an increase in the amount of adsorbed BrO3- on the photocatalyst surface.

Bromates↗