Topic
Potassium dichromate
About: Potassium dichromate is a research topic. Over the lifetime, 1430 publications have been published within this topic receiving 18967 citations. The topic is also known as: Potassium dichromate(VI) & Chromium potassium oxide.
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TL;DR: In this article, the dependence of density and viscosity on temperature and concentration has been correlated and the relationship between relative changes in viscosities and solute-mixed solvent interaction has been probed.
Abstract: Densities and viscosities of chromium trioxide + potassium chromate + potassium dichromate + water quaternary mixtures and potassium chromate + potassium dichromate + water ternary mixtures have been measured from (298.15 to 333.15) K. The dependence of density and viscosity on temperature and concentration has been correlated. Apparent molar volumes, standard partial molar volumes, and the viscosity B-coefficient of chromium trioxide were calculated from the experimental measurements. The solute-mixed solvent interaction, solute–solute interaction, and structure-making effect of chromium trioxide have been discussed using the Helper equation and the Jones−Dole equation. The relationship between relative changes in viscosity and solute-mixed solvent interaction has been probed.
14 citations
TL;DR: In this paper, it was shown that p-chloroaniline has a lethal effect on the embryos of Xenopus laevis at a concentration of 100 ppm and is development inhibiting at concentrations of 1 and 10 ppm, respectively.
14 citations
Journal Article•
TL;DR: The DNA synthesis test seems to be a reliable in vitro method to aid in the diagnosis of chromium sensitivity, as measured by increased DNA synthesis.
Abstract: Peripheral blood lymphocytes from 31 patients with a positive patch test to potassium dichromate (K2Cr2O7) and from 24 healthy controls were stimulated with various concentrations of chromium chloride (CrCl3) and/or chromium basic sulphate (Cr4(SO4)5(OH)2), sodium chromate (Na2CrO4) or K2Cr2O7 on various days of culture. Both trivalent and hexavalent chromium compounds could induce lymphocyte transformation, as measured by increased DNA synthesis. The response occurred in the T-enriched population and was monocyte dependent. Lymphocytes from 11 of these patients could not be stimulated with the chromium compounds in vitro, whereas the in vivo serial dilution test (SDT) was positive in 4 and negative in 7 of them. Lymphocytes from 2 patients with a negative in vivo SDT showed a positive response in vitro. The strength of the in vivo SDT results did not correlate well with the height of in vitro responses. The DNA synthesis test seems to be a reliable in vitro method to aid in the diagnosis of chromium sensitivity.
14 citations
TL;DR: A new simple, sensitive and reproducible spectrophotometric method based on the reduction of nifedipine with Zn/NNH4Cl followed by coupling with N-methyl-1,4-benzoquinoneimine--the oxidation product of 4-(methylamino)phenol, to give a chromophore which absorbed maximally at 525 nm is proposed.
Abstract: A new simple, sensitive and reproducible spectrophotometric method for the determination of nifedipine in pure and dosage forms has been proposed. It is based on the reduction of nifedipine with Zn/NNH4Cl, followed by coupling with N-methyl-1,4-benzoquinoneimine--the oxidation product of 4-(methylamino)phenol, to give a chromophore which absorbed maximally at 525 nm. The experimental conditions were optimised and Beer's law was obeyed over the concentration range of 5-175 microg ml(-1). The molar absorptivity, detection limit, recovery and RSD were found to be 1.9 x 10(3) l mol(-1) cm(-1), 1.1 microg ml(-1), 99.7-100.5% and 0.3-0.8%, respectively. The proposed method was compared favourably with the official B.P. method.
14 citations
TL;DR: Ruthenium in various chemical forms can be evolved as the tetroxide from insoluble matrix materials by heating the sample with chromium( VI)-condensed phosphoric acid reagent (abbreviated as Cr(VI)-CPA), which might be useful for the separation of rutenium in geochemical or neutron-activation analysis.
14 citations