Showing papers on "Brilliant green published in 1995"
TL;DR: No one isolate proved to be best for all dyes, and some were poor in most tests, but Phanerochaete chrysosporium was among the least effective of the isolates.
232 citations
TL;DR: Eight triphenylmethane dyes have been characterized by particle beam liquid chromatography-mass spectrometry and exhibit similar fragmentation, with the formation of phenyl and substituted phenyl radicals, and loss of alkyl groups from the amines.
20 citations
TL;DR: In this paper, the photochemistry of substituted triphenylmethane dyes was investigated in poly(vinyl alcohol) films at room temperature, and it was shown that the dye cation and its counter anion formed a leuco structure, assisted by visible light.
Abstract: The photochemistry of substituted triphenylmethane dyes was investigated in polymer films. Malachite green and brilliant green showed thermally stable photobleaching on visible light irradiation in poly(vinyl alcohol) films at room temperature. UV light irradiation of photobleached films recovered the blue colour. Such inverse photochromism is due to the binding of the dye cation and its counter anion to form a leuco structure, assisted by visible light, and the dissociation of the leuco structure by UV light irradiation. UV light irradiation also caused homolytic cleavage, leading to the formation of radicals, which resulted in a gradual decrease in the extent of colour change with increasing numbers of photoreaction cycles. Although symmetrically substituted dyes, such as crystal violet and ethyl violet, showed photobleaching on visible irradiation, no recolouration occurred on UV light irradiation.
11 citations
TL;DR: In this paper, the streaming potential and sorption of polyester fibers treated with different amounts of potassium ethyl xanthogenate, at constant temperature, and later dyed with the cationic dye Brilliant Green, is described.
9 citations
TL;DR: A simple, selective, and sensitive field procedure for the spectrophotometric determination of thallium in water is described in this article, which is reproducibly applicable to the field analysis of Tl in water samples containing upto 20 ppb.
Abstract: A simple, selective, and sensitive field procedure for the spectrophotometric determination of thallium in water is described. The preconcentration is carried out by extracting the chlorothallate ion-pair complex of a cationic surfactant, i.e. CTAB or CPC, with toluene. The extract is reacted with a basic dye, i.e. brilliant green (BG). The molar absorptivity of the complexes is in the range of (1.63–1.70)×105 1 mole−1 cm−1 at the absorption maximum of 640 nm. The detection limit is 5 ng ml−1 Tl in water. None of the tested metal ions upto certain levels interfered with the determination. It is reproducibly applicable to the field analysis of Tl in water samples containing upto 20 ppb.
5 citations
Journal Article•
TL;DR: In this paper, the double scattering and anti-scattering spectra of the ion-association complexes of [Hg(SCN)4]2- with the basic triarylmethane dye such as crystal violet (CV), malachite green (MG), brilliant green (BG), and iodide green (IG), their spectral characteristics and effective factors, and the optimum conditions of the reaction were investigated.
Abstract: The double scattering (DS) and anti-scattering (ADS) spectra of the ion-association complexes of [Hg(SCN)4]2- with the basic triarylmethane dye such as crystal violet (CV), malachite green (MG), brilliant green (BG), and iodide green (IG), their spectral characteristics and effective factors, and the optimum conditions of the reaction were investigated. The relation between the intensities of DS and ADS light and the concentration of mercury(Ⅱ) was established. A new and highly sensitive way for the determination of mercury(Ⅱ) by the ADS spectra has been proposed. Preliminary dicussed the mechanism of the reaction and the reasons of the change in the double scattering.
3 citations
2 citations
TL;DR: In this paper, a simple and sensitive spectrophotometric method for the quantification of iodine and iodide in waters is described, where iodide has been oxidised by sodium nitrite to iodine in HCl medium and the resulting I2Cl− has been preconcentrated into toluene.
Abstract: A simple, fast and sensitive spectrophotometric method for the quantification of iodine and iodide in waters is described. Firstly iodide has been oxidised by sodium nitrite to iodine in HCl medium and the resulting I2Cl− has been preconcentrated into toluene. This can be subsequently determined in the extract with brilliant green. A ten-fold preconcentration is obtained, the molar absorptivity is (4.2×104) I mol−1 cm−1 at 635 nm. A detection limit of 4 ng/ml iodide in water can be reached. The effect of common anions and cations have been investigated. The method has been applied to the determination fo free iodine, total iodine and iodide in river, pond and well water.
2 citations
Journal Article•
1 citations
TL;DR: A field procedure for the spectrophotometric determination of antimony contamination of water is described in this article, based on preconcentration of Sb(V) into toluene by equilibrating the aqueous solution with the organic solution of N,N'diphenylbenzamidine (DPBA) and subsequent color development of the extract by reacting with basic dye i.e. brilliant green (BG).
Abstract: A field procedure for the spectrophotometric determination of antimony contamination of water is described. The method is based on preconcentration of Sb(V) into toluene by equilibrating the aqueous solution with the organic solution of N,N'‐diphenylbenzamidine (DPBA) and subsequent color development of the extract by reacting with basic dye i.e. brilliant green (BG). The detection limit is 5 ng Sb mL‐1 of water. The molar absorptivity of the complex is (1.53) x 105 1 mole‐1 cm‐1 at absorption maximum 640 nm. None of the tested metal ions have been found to interfere in the present method. The method is applicable for the field detection of Sb contamination of water down up to 15 ng mL‐1.