Uric acid is an Analyte. Excess uric ─ hyperuricemia leads to gout and renal stones. Frabot noted that added alkaline tungstate solution developed intense blue colour. A colorimetric method widely utilized quantify depends on the reduction of chromogen sodium by produce a measurable colour change. The reaction route from initial products coloured compounds oxido-degradation organic substance ha...

The investigation of Fe-W alloys is growing in comparison to other W with iron group metals due the environmental and health issues linked Ni Co materials. influence Na2WO4 concentration range 0 0.5 M on bath chemistry electrode reactions Pt alloys’ electrodeposition from citrate electrolyte was investigated by means rotating disk (RDE) cyclic voltammetry (CV) synchronized electrochemical quart...

It is known that the flotation separation of scheelite and calcite quite difficult due to their similar surface properites. To slove problem, ethylenediaminetetra (methylene phosphonic acid) sodium (EDTMPS), an environmentally friendly reagent, was employed as efficient depressant for first time. In experiments, it demonstrates EDTMPS could strongly inhibit but barely affect flotaiton behavior ...

The effect of NO23 uptake on cellular pH was studied in maize roots by an in vivo P-NMR technique. In order to separate the effects on cytoplasmic pH due to NO23 uptake from those due to NO23 reduction, tungstate was used to inhibit nitrate reductase (NR). The results confirm that in maize roots tungstate inhibited NR activity. N-NMR in vivo experiments demonstrated the cessation of nitrogen fl...

The effect of NO3- uptake on cellular pH was studied in maize roots by an in vivo 31P-NMR technique. In order to separate the effects on cytoplasmic pH due to NO3- uptake from those due to NO3- reduction, tungstate was used to inhibit nitrate reductase (NR). The results confirm that in maize roots tungstate inhibited NR activity. 15N-NMR in vivo experiments demonstrated the cessation of nitroge...

In order to limit the dispersive use of lead on small arms firing ranges, 5.56-mm bullets with tungsten-nylon composite material cores have been fired at a number of Army training ranges. Tungsten in bullet residues oxidizes when exposed to the atmosphere, yielding an amorphous tungsten oxide (WO3) coating. This coating rapidly dissolves to yield the tungstate anion (WO4), which can migrate in ...

Nanocrystalline Ni-W alloys having both high ductility and high strength were produced by electrodeoisition. The plating bath for the electrodeposition contained nickel sulfate, citric acid, sodium tungstate and ammonium chloride, and was operated at various bath concentrations and conditions of electrolysis. The ductility and tensile strength of the deposited alloys are strongly influenced by ...

Synthesis of adipic acid by catalytic oxidation of cyclohexanone with 30% hydrogen peroxide in the presence of sodium tungstate catalyst can be well performed under reflux temperature. The adipic acid isolated yield reaches to 82.1%, and the purity of the product is also very high. The catalytic oxidation reaction takes place without any organic solvent and phase-transfer agent. The effects ove...