Topic
Color reaction
About: Color reaction is a research topic. Over the lifetime, 1194 publications have been published within this topic receiving 19579 citations.
Papers published on a yearly basis
Papers
More filters
TL;DR: In this paper, a highly sensitive and selective spectrophotometric method is proposed for direct determination of trace molybdenum in plant tissues, which is based on the reaction of moly bdenum (VI) with a new analytical reagent 9-(2,4-dihydroxyphenyl)-2,3,7-trihydroxyl-6-fluorone (DHPTHF).
14 citations
TL;DR: Barbituric acid reacts with chloral hydrate in alkaline media, after heating for 1 min. at 100°C to give an orangish yellow colour having maximum absorbance at 450 nm as discussed by the authors.
Abstract: Barbituric acid reacts with chloral hydrate in alkaline media, after heating for 1 min. at 100°C to give an orangish yellow colour having maximum absorbance at 450 nm. The reaction is selective for barbituric acid with 0.01 mg/ml as the visual limit of quantitation and provides a basis for a new spectrophotometric determination. The colour reaction obeys Beer's Law from 0.001 to 0.6 mg/ml and the relative standard deviation is 1.1%. The quantitative assessment of tolerable amounts of other drugs is also studied.
14 citations
TL;DR: In this paper, a green color was obtained for imipramine-HCl with 0.001 mg/ml as visual limit of quantitation and provided a basis for a new spectrophotometric determination.
Abstract: Imipramine-HCl reacts with ammonium vanadate in the presence of HCl to give a green colour having maximum absorbance at 400-410 nm. The reaction is selective for imipramine-HCl with 0.001 mg/ml as visual limit of quantitation and provides a basis for a new spectrophotometric determination. The colour reaction obeys Beer's law from 0.001 mg to 0.05 mg/ml of imipramine-HCl and the relative standard deviation is 1.1%. The quantitative assessment of the tolerable amount of other drugs is also studied. The method has been applied to pure drugs as well as to commercial preparations and is precise and reproducible.
14 citations
TL;DR: The colour reaction is sensitive and the absorbance of the extract in 5 ml of xylene obeys Beer's law at saccharin concentrations between 20 and 400 µg ml–1.
Abstract: Saccharin reacts quantitatively with phenothiazine (thiodiphenylamine) and copper(II) acetate dissolved in 50%V/V ethanol at 70 °C. The reaction product can be dissolved in an organic solvent and has a characteristic colour. The colour reaction is sensitive and the absorbance, at 510 nm, of the extract in 5 ml of xylene obeys Beer's law at saccharin concentrations between 20 and 400 µg ml–1. Cyclamates, sorbic acid, benzoic acid, 4-hydroxybenzoic acid and dehydroacetic acid do not interfere. Recoveries of saccharin from soft drinks were satisfactory. A procedure suitable for routine use is proposed.
13 citations
TL;DR: Chromal blue G in the presence of cetyltrimethylammonium chloride is proposed for the spectrophotometric determination of microgram amounts of beryllium.
13 citations