The reactions of the chromate, dichromate, and permanganate ions with 100% sulfuric acid and dilute oleum

1987 ◽  
Vol 65 (11) ◽  
pp. 2665-2669 ◽  
Author(s):  
R. J. Gillespie ◽  
R. Kapoor
Keyword(s):  
Sulfuric Acid ◽  
Absorption Spectra ◽  
Potassium Permanganate ◽  
Potassium Dichromate ◽  
Potassium Chromate

Solutions of potassium chromate and potassium dichromate in 100% sulfuric acid and dilute oleum have been investigated by cryoscopic and conductimetric methods. It is shown that they both react to give the compound CrO2(HSO4)2. The absorption spectra of solutions of potassium chromate and dichromate in 100% sulfuric acid are very similar to the spectra of species of the type CrO2X2. Potassium permanganate dissolves in 100% sulfuric acid to give green solutions which are shown to contain MnO3•SO4H. The formation of this compound has been further confirmed by conductimetric measurements in dilute oleum. The absorption spectra of these green solutions are also consistent with the formation of a species of the type MnO3X.

Preparation of Thin Cadmium Telluride Samples for Electron Microscope Studies

1974 ◽  
Vol 32 ◽  
pp. 548-549
Author(s):  
T. J. Magee ◽  
J. Peng ◽  
J. Bean
Keyword(s):  
Electron Microscope ◽  
Sulfuric Acid ◽  
Solid State ◽  
Sample Preparation ◽  
Cadmium Telluride ◽  
Potassium Dichromate ◽  
Optical Components ◽  
The Past ◽  
Solid State Devices

Cadmium telluride has become increasingly important in a number of technological applications, particularly in the area of laser-optical components and solid state devices, Microstructural characterizations of the material have in the past been somewhat limited because of the lack of suitable sample preparation and thinning techniques. Utilizing a modified jet thinning apparatus and a potassium dichromate-sulfuric acid thinning solution, a procedure has now been developed for obtaining thin contamination-free samples for TEM examination.

Oxidative peeling of carbon black nanoparticles

RSC Advances ◽  
2015 ◽  
Vol 5 (112) ◽  
pp. 92539-92544 ◽  
Author(s):  
Peter M. Wilson ◽  
François Orange ◽  
Maxime J.-F. Guinel ◽  
Mikhail Shekhirev ◽  
Yang Gao ◽  
...  
Keyword(s):  
Sulfuric Acid ◽  
Carbon Black ◽  
Potassium Permanganate ◽  
Carbon Black Nanoparticles

We demonstrate that layered carbon black nanoparticles can be oxidatively peeledviathe reaction with potassium permanganate in sulfuric acid.

Effect of Oxidant on the Leaching Rate of Indium from Water Quenching Slag

2013 ◽  
Vol 591 ◽  
pp. 122-125
Author(s):  
Li Jiao Yang ◽  
Si Chen ◽  
Yan Zhang ◽  
Nan Chun Chen ◽  
Jun Gao ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Sulfuric Acid ◽  
Potassium Permanganate ◽  
Crystal Violet ◽  
Acid Leaching ◽  
Water Quenching ◽  
Test Results ◽  
Leaching Rate ◽  
Initial Concentration ◽  
Solid Ratio

Extracting indium from water quenching slag, which contains poor indium, by two process of leaching, the effect of different oxidants and dosages on the leaching rate of indium in water quenching slag were studied. The leaching conditions: temperature 80 °C, leaching time 2 h, the liquid to solid ratio of neutral leaching 8︰1, the liquid to solid ratio of acid leaching 2︰1, initial concentration of sulfuric acid 500 g·L-1, adding different oxidants, the concentration was detected by crystal violet spectrophotometry. Test results showed that the leaching rate of indium was significantly improved by adding hydrogen peroxide and potassium permanganate. Compared with the effect of different oxidants, the effect of potassium permanganate was significantly higher than that of hydrogen peroxide on the leaching rate of indium.

Who Made Mauveine First: Runge, Fritsche, Beissenhirtz or Perkin?

2016 ◽  
Vol 40 (12) ◽  
pp. 758-762
Author(s):  
M. John Plater ◽  
Andrea Raab
Keyword(s):  
Sulfuric Acid ◽  
Potassium Dichromate ◽  
Original Method

The oxidation of aniline or a mixture of aniline with o-toluidine and p-toluidine following Runge's original method as carefully as possible, using chloride of lime [Ca(OCl)2], produces a coloured solution from which small amounts of mauveine were purified, isolated and analysed by LC-MS. The oxidation of aniline by the method of Fritsche and Beissenhirtz, using potassium dichromate and sulfuric acid, similar to W.H. Perkin's patented method, also gave small quantities of mauveine. The composition of the anilines are suggested depending upon their sources and Kekulé's comments on these early contributions are summarised.

Feline Insular Amyloid: Histochemical Distinction from Secondary Systemic Amyloid

1981 ◽  
Vol 18 (2) ◽  
pp. 181-187 ◽  
Author(s):  
B. L. Yano ◽  
K. H. Johnson ◽  
D. W. Hayden
Keyword(s):  
Sulfuric Acid ◽  
Potassium Permanganate ◽  
Congo Red ◽  
Staining Procedure ◽  
Domestic Cats ◽  
Tissue Sections ◽  
Dilute Sulfuric Acid ◽  
Congo Red Staining ◽  
Red Dye ◽  
Human Primate

Amyloid in islets of Langerhans from 48 domestic cats, one human, one non-human primate, and one raccoon was compared with secondary systemic amyloid from three domestic cats, one dog, one human, and one cow to determine affinity for Congo red dye after treatment of paraffin-embedded tissue sections with potassium permanganate and dilute sulfuric acid. Insular amyloid from all six species was resistant to pretreatment with potassium permanganate, i.e., affinity for Congo red was retained, whereas secondary systemic amyloid from all species was sensitive to the potassium permanganate pretreatment. Other stains did not distinguish between insular and secondary systemic amyloid. The potassium permanganate-Congo red staining procedure thus can be used to differentiate insular from secondary systemic amyloid in the cat and other species. The results also indicate that insular amyloid and secondary systemic amyloid are of different chemical composition and pathogenesis.

Potassium Permanganate and Potassium Dichrornate Standard Solutions

1965 ◽  
Vol 48 (4) ◽  
pp. 701-702
Author(s):  
Radmilo Ristich
Keyword(s):  
Potassium Permanganate ◽  
Potassium Dichromate ◽  
Methods Of Analysis ◽  
Official Methods Of Analysis ◽  
Standard Solutions

Abstract A review of Official Methods of Analysis revealed no revision necessary for the preparation and standardization of potassium dichromate solutions. Recommendations are made for the standardization of potassium permanganate solutions for three methods of analysis.

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