Bulletin of the Chemical Society of Japan · 1965 · 10 citations · 0 references
Natural SciencesChemistryAnalytical ChemistryElemental AnalysisInorganic ChemistryColor AnalysisColor ChemistryChromium Analytical DetectionColorimetric TestsFood Colorant ChemistryPh Effects On ColorThorium AnalysisThorium Chemistry
Abstract A method for the colorimetric determination of thorium with Chromotrope 2 B has been described. The composition of the coloured chelate (λmax 550 mμ) is Th(Ke)2. The system adheres to Beer’s law from 074 p.p.m. to 16.6 p.p.m. of thorium between pH 3.0 and 6.5 at all temperatures from 5 to 95°C. The sensitivities are 0.232 γ/cm2 (Sandell) and 2.32 γ/cm2(practical) based on an absorbance of 0.01 unit at 580 mμ. The interference of some cations and anions has also been reported.