Showing papers on "Brilliant green published in 1981"
TL;DR: In this article, a solvent extraction procedure has been applied to the determination of boron in steel, where boric acid is converted to the monovalent complex anion, BR2-(where H2R is 2,4-dinitronaphthalene-1,8-diol), in acetic acid medium, extracted as a coloured ion associate with Brilliant Green into toluene and determined spectrophotometrically.
Abstract: On the basis of previous work, a solvent extraction procedure has been applied to the determination of boron in steel. The boron (as boric acid) is converted to the monovalent complex anion, BR2–(where H2R is 2,4-dinitronaphthalene-1,8-diol), in acetic acid medium, extracted as a coloured ion associate with Brilliant Green into toluene and determined spectrophotometrically. Steel samples were dissolved in a mixture of dilute hydrochloric acid and hydrogen peroxide and large amounts of iron and other metal ions in the solution were removed either by solvent extraction with 4-methylpentan-2-one or by precipitation as hydroxides or oxinates. Micro amounts of boron in steel samples (0.0013–0.012%) were determined.
15 citations
TL;DR: A strain of Pseudomonas aeruginosa having colonies that resemble those of salmonellas on brilliant green agar is almost totally inhibited by the addition of 1.0 mg/ml of sulphacetamide to the medium.
Abstract: A strain of Pseudomonas aeruginosa having colonies that resemble those of salmonellas on brilliant green agar is almost totally inhibited by the addition of 1.0 mg/ml of sulphacetamide to the medium. Low numbers of Ps. aeruginosa grew equally well on brilliant green and nutrient agar, but 106–107 organisms were needed before any growth appeared on the medium containing sulphacetamide. During 12 months of routine use of the sulphacetamide medium, involving almost 3000 plates, Ps. aeruginosa has been isolated as a contaminant only once. Forty-seven salmonella serotypes were grown on the sulphacetamide brilliant green agar in the same period.
1 citations
LGC1
TL;DR: In this paper, the authors describe the solvent extraction of thallic bromide into diethyl ether for the separation of thallium from the interfering elements, such as antimony, tin, mercury, cadmium, chromium, and tungsten.
Abstract: Publisher Summary
This chapter discusses the spectrophotometric determination of thallium from silicate rock material, using brilliant green. It is necessary to separate thallium from interfering elements, such as antimony, tin, mercury, cadmium, chromium, and tungsten. The chapter describes the solvent extraction of thallic bromide into diethyl ether for the separation of thallium from the interfering elements. The reaction between the anion TlBr4- and the brilliant green cation gives an organic-soluble green color complex with maximum absorption at the wavelength of 627 nm. Higher sensitivities for thallium are obtained from the methods that are based upon the quenching of the fluorescence of cochineal red and uranyl sulfate, or on the fluorescence given by thallium with rhodamine B, or of the thallous chloro complex. In all the cases, a prior separation using ion-exchange, solvent extraction, or co-precipitation techniques is required. Atomic absorption spectroscopic (AAS) methods based on the aspiration of the aqueous acid solution of rock material are not of sufficient sensitivity for determining the thallium content of most silicate rocks.