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Sodium dichromate

About: Sodium dichromate is a research topic. Over the lifetime, 421 publications have been published within this topic receiving 6202 citations. The topic is also known as: Disodium salt & sodium bichromate.


Papers
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Journal ArticleDOI
TL;DR: In this paper, an investigation is reported of chemical and electrochemical oxidation of coal as a potential route to coal liquids and other derived products, and it is shown that mild oxidation with a number of reagents gave high molecular mass (MM) material in addition to carboxylic acid derivatives of mono and polycyclic aromatic compounds.

4 citations

Patent
16 Jan 1987
TL;DR: In this article, a wood preservative composition containing as active ingredients compounds of copper, of chromium and of arsenic is produced by mixing copper arsenate and sodium dichromate in an aqueous medium into which is introduced strong acid, for example sulphuric acid, effective to achieve a soluble product.
Abstract: Wood preservative compositions containing as active ingredients compounds of copper, of chromium and of arsenic are produced by mixing copper arsenate and sodium dichromate in an aqueous medium into which is introduced strong acid, for example sulphuric acid, effective to achieve a soluble product. The acid addition is preferably effective to reduce the pH to below 0. The composition so produced is a homogeneous paste which may be dissolved in water to working concentration and used for the preservation of wood by impregnation techniques.

4 citations

Journal ArticleDOI
TL;DR: In this article, the effects of various extraction and stripping parameters, such as equilibrium pH (7.0, 8.5 and 10), extractant concentration (5, 10 and 20 volume %), organic-to-aqueous (O/A) ratio and stripping agent type and concentration were studied on chromium recovery from chromium electroplating rinse bath wastewater using Aliquat 336.
Abstract: In this study, the effects of various extraction and stripping parameters, such as equilibrium pH (7.0, 8.5 and 10), extractant concentration (5, 10 and 20 volume %), organic-to-aqueous (O/A) ratio and stripping agent type and concentration were studied on chromium (VI) recovery from chromium electroplating rinse bath wastewater using Aliquat 336. Results showed that these parameters all had significant effects on chromium (VI) recovery. A pregnant strip solution from a chromium electroplating rinse bath wastewater with 33.4 g/L chromium content, suitable for sodium dichromate production, was generated by 20 vol. % Aliquat 336 in commercial kerosene. The O/A ratio was 1/4 and the equilibrium pH value was 0.87, the as-received pH value. The wastewater was treated with a two-stage countercurrent extraction process to produce a loaded organic phase, which was later stripped at the O/A ratio of two with a 4-M NaOH solution in a two-stage countercurrent stripping process using Taguchi’s optimization technique.

4 citations

Journal ArticleDOI
TL;DR: The spectroscopy and photochemical behavior of chromate ester cluster ions in vacuo in the visible and near-UV is investigated in the framework of organometallic redox mechanisms and density functional theory.
Abstract: In the present study, we investigate the spectroscopy and photochemical behavior of chromate ester cluster ions in vacuo in the visible and near-UV. Chromate ester cluster ions Nan[CrO3(OCH3)]n+1– (n = 1, 2) are generated by electrospray ionization of sodium dichromate in water and methanol. Upon irradiation with photon energies between 2 and 5.6 eV, dissociation occurs. The photodissociation spectra of these ions are very similar to the UV/vis absorption spectra of the sample solution with solvatochromic shifts less than 0.1 eV. The electronic excitations in this photon energy range are assigned to ligand-to-metal charge transfer from the oxygen ligands to the chromium within the chromate ester. Fragment channels corresponding to intracluster reactions involving reduction of the metal centers as well as evaporative processes leading to the loss of a neutral Na[CrO3(OCH3)] salt unit are observed. The results are discussed in the framework of organometallic redox mechanisms and density functional theory.

4 citations

Journal ArticleDOI
TL;DR: Whether there is a connection between the activity of chromate reduction in vitro and nephrotoxicity in vivo and whether the kidneys of young rats are less susceptible to chromate than those of adults is investigated.

4 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20211
20201
201916
201817
20178
201617