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Showing papers on "Sodium dichromate published in 1975"


Patent
24 Dec 1975
TL;DR: Gelled acidic compositions suitable for either matrix acidizing or fracture-acidizing of subterranean formations, and methods of using said compositions in acidizing operations, are provided in this paper, where water, a water-dispersible polymer of acrylamide, an acid, and a flavotannin gelling agent.
Abstract: Gelled acidic compositions suitable for either matrix acidizing or fracture-acidizing of subterranean formations, and methods of using said compositions in acidizing operations, are provided. Said compositions comprise water, a water-dispersible polymer of acrylamide, an acid, and a flavotannin gelling agent. In a preferred embodiment, said compositions also comprise a gelation promoter, e.g., sodium dichromate or potassium dichromate.

25 citations


Journal ArticleDOI
21 Mar 1975-Science
TL;DR: The amino acid sequence of the first 35 residues of a low-molecular-weight protein obtained from the urine of rabbits treated with sodium dichromate was determined and shown to be identical with human beta2-microglobulin in 30 positions.
Abstract: The amino acid sequence of the first 35 residues of a low-molecular-weight protein obtained from the urine of rabbits treated with sodium dichromate was determined and shown to be identical with human beta2-microglobulin in 30 positions. Rabbit beta2-microglobulin, like the human protein, is strikingly homologous to the constant regions of rabbit immunoglobulin G, particularly the CH3 region.

23 citations


Journal ArticleDOI
TL;DR: A kinetic study of the oxidation of a series of substituted benzyl alcohols and benzaldehydes by neutral aqueous sodium dichromate has been completed in this paper, showing that the aldehydes are more resistant to oxidation than the alcohols.
Abstract: A kinetic study of the oxidation of a series of substituted benzyl alcohols and benzaldehydes by neutral aqueous sodium dichromate has been completed. The aldehydes are more resistant to oxidation ...

14 citations


Patent
02 Jan 1975
TL;DR: In this paper, a solution of 12.5 to 37.5 g/l. of sodium dichromate and 12.3 to 15 ml/l of formaldehyde and maintaining the pH of the solution at a pH value of 1.4 to 2.7.
Abstract: Zinc articles or, respectively, articles being electroplated with zinc are rapidly coated with a resistant and well adhering colored electroless chromium plating by immersing the articles in an aqueous bath containing besides known wetting agents A. a solution of 12.5 to 37.5 g/l. of sodium dichromate and 12.5 to 37.5 g/l. of sodium nitrate, said solution being adjusted to a pH value of 0.3 with nitric acid, B. 25 to 70 g./l. of formic acid and/or chloroformic acid, C. 0 to 40 ml./l. of glacial acetic acid and concentrated acetic acid respectively and/or glycolic acid, glycocoll, chloroacetic acid, trifluoro-acetic acid and, if desired D. 0 to 15 ml./l. of formaldehyde and maintaining the pH of the solution at a pH value of 1.4 to 2.7.

4 citations


Journal ArticleDOI
TL;DR: When crystals of sodium dichromate dihydrate are heated at 1 atm pressure, the phase change Na2Cr2O7,2H2O → Na2cr2O 7,H 2O + saturated solution occurs at 82.8°C with the absorption of 17.6±0.95 kJ per mole of dihydrates as discussed by the authors.
Abstract: When crystals of sodium dichromate dihydrate are heated at 1 atm pressure, the phase change Na2Cr2O7,2H2O → Na2Cr2O7,H2O + saturated solution occurs at 82.8°C with the absorption of 17.6±0.95 kJ per mole of dihydrate. A second phase change Na2Cr2O7,H2O → Na2Cr2O7 + saturated solution occurs at 91.1°C with the absorption of a further 12.4±1.5 kJ per mole of dihydrate.

1 citations