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chromium iii encyclopedia

Chroom(III)oxide - Wikipedia

Chroom(III)oxide is een oxide van chroom, met als brutoformule Cr 2 O 3.De stof komt voor als een groen, reukloos hygroscopisch kristallijn poeder, dat onoplosbaar is in water.Bij verhitting kleurt het bruin, na afkoeling weer groen. Het synthetische pigment chroomoxidegroen werd in 1929 door Bayer AG op de markt gebracht. In tegenstelling tot andere chroomverbindingen, wder de ...

Chromium - World Encyclopedia - Ik wil alles weten - 2021

chromium (chemisch symbool Cr, atoomnummer 24) is een hard, glanzend, staalgrijs metaal dat een hoge glans krijgt en niet aantast.Het wordt daarom gebruikt in legeringen, zoals roestvrij staal, en in verchromen. Het menselijk lichaam heeft sporen van driewaardig chroom (chroom (III)) nodig voor het suikermetabolisme, maar zeswaardig chroom (chroom (VI)) is zeer giftig.

Chromium III Oxide - Big Chemical Encyclopedia

Chromium III Oxide Reduction with ammonium salts provides chromium(lll) oxide with a particularly low sulfur content Chromiutti(lII) oxide is obtained by reducing sodium dichromate with organic materials, charcoal or sulfur in an exothermic reaction These reactions are carried out continuously in furnaces. The reacted mixture is leached with water to remove soluble products, filtered, dried ...

Chromium(III) oxide powder, 99.9% trace metals basis ...

Chromium(III) oxide (Cr 2 O 3) ... Ullmann's Encyclopedia of Industrial Chemistry (2000) Wang, X. et al. Inorganic Chemistry, 37, 3252-3252 (1998) High levels of dietary unsaturated fat decrease alpha-tocopherol content of whole body, liver, and plasma of chickens …

Chromium as an Environmental Pollutant: Insights on ...

In the past decades the increased use of chromium (Cr) in several anthropogenic activities and consequent contamination of soil and water have become an increasing concern. Cr exists in several oxidation states but the most stable and common forms are Cr(0), Cr(III) and Cr(VI) species. Cr toxicity in plants depends on its valence state. Cr(VI) as being highly mobile is toxic, while Cr(III) as ...

chromium ore encyclopedia

Chromium processing Encyclopedia Britannica. Chromium processing, preparation of the ore for use in various products. Chromium (Cr) is a brilliant, hard, refractory metal that melts at 1,857 °C (3,375 °F) and boils at 2,672 °C (4,842 °F). In the pure state it is resistant to ordinary corrosion, resulting in its application as an electroplated

Chromium - an overview | ScienceDirect Topics

A. Yalçın Tepe, in Encyclopedia of Food Safety, 2014 Chromium. Chromium (III) is an essential mineral and is widely present in a variety of foods. Intake of chromium(III) by the general population is considered adequate. However, the additional intake of chromium(III) supplements for nutritional purposes is not considered to be of concern provided that the amount of total chromium does not ...

Chromium(III) chloride 1 wiki - GuideChem

Chromium(III) chloride Iupac Name:chromium(3+);trichloride CAS No.:1 Molecular Weight:158.346 Introduction: Chromium(III) chloride is used for chromium plating; as textile mordant; in tanning; as a waterproofing agent; and as catalyst for polymerization of olefins.

Effective Removal of Chromium(III) from Low Concentration ...

In this study, a novel coordination polymer [CdL2(H2O)0.5]n (1), [HL = 4-(2-(4-((pyridin-3-yl)methoxy)phenyl)diazenyl)benzoic acid] was fabricated via an in situ ligand transformation reaction under solvothermal conditions. The as-prepared polymer exhibited a selectivity and efficiency for Cr(III) removal with a high uptake capacity of 106.13 mg·g−1. Interestingly, even in the low ...

Chromium(III) hydroxide, The Free Encyclopedia

Chromium(III) hydroxide is a gelatinous green inorganic compound with the chemical formula Cr(OH) 3. It is a polymer with an undefined structure and low solubility. It is amphoteric, dissolving in both strong alkalis and strong acids. In alkali: Cr(OH) 3 + OH − → CrO − 2 + 2 H 2 O In acid: Cr(OH) 3 (OH 2) 3 + 3 H + → Cr(OH 2) 3+ 6

Anhydrous Chromium III Sulfate - Big Chemical Encyclopedia

Anhydrous Chromium III Sulfate The method outlined here is similar to the latter but obviates the separation of potassium sulfate from the product. The new methods described below for obtaining various tris (ethylenediamine) chromium(III) salts with anhydrous chromium(III) sulfate as the starting material can be used also for preparing the corresponding propylenediamine derivatives.

Chromium(III)_oxide - chemeurope.com

Structure and properties. Cr 2 O 3 adopts the corundum structure, consisting of cubic close packed oxides with 2/3 of the octahedral holes occupied by chromium. It is an amphoteric oxide, dissolving in acids to give chromium(III) salts and in molten alkali to give chromites. Production. The Parisians Pannetier and Binet first prepared Cr 2 O 3 in 1838 via a secret process.

Chromium(III) chloride Structure, Preparation, Reactions ...

Chromium(III) chloride Chromium trichloride. Other names Chromic chloride. Identifiers CAS Number. 1 ...

Chromium Iii Encyclopedia - meppelink-westerhof.nl

Encyclopedia Of Surfactants Vol 3 Iii P Z PDF Download. 3 iii p z encyclopedia of surfactants vol 3 iii p z oebensde, browse and read ... chromium (iii) by two aqueous phases .

Chromium(III)-Molbase

Molbase found 78 Chromium(III) product information for you, including Chromium(III) formula, Chromium(III) CAS number, Chromium(III) supplier information. 0086-400-6021-666 [email protected]

Chromium | Encyclopedia

Chromium's peculiarity is that its behavior relies on its valence state. Cr(III) is a trace element in humans and plays a major role in glucose and fat metabolism. The beneficial effects of Cr(III) in obesity and types 2 diabetes are known. It has been long considered an essential element, but now it

Chromium(III)_chloride

Chromium(III) chloride (also called chromic chloride) is a violet coloured solid with the formula CrCl 3.. Although it is ionic, the solid state structure is kinetically inert so that anhydrous CrCl 3 is surprisingly reluctant to dissolve in water. However, in the presence of a trace of a reducing agent capable of reducing Cr 3+ to Cr 2+, the CrCl 3 dissolves rapidly to form soluble complexes ...

Chromium Compounds - US EPA

Chromium III No data are available on the carcinogenic potential of chromium (III) compounds alone. (1,8) EPA has classified chromium (III) as a Group D, not classifiable as to carcinogenicity in humans. (8) EPA has stated that "the classification of chromium (VI) as a known human carcinogen raises a

Chromium | Encyclopedia.com

14-05-2018· CHROMIUM (REVISED) Note: This article, originally published in 1998, was updated in 2006 for the eBook edition. Overview. Chromium is found in the center of the periodic table, a chart that shows how chemical elements are related to each other.Elements in Groups 3 through 12 are known as the transition metals.

Chromium(III) acetyl-Molbase

Molbase found 1 Chromium(III) acetyl product information for you, including Chromium(III) acetyl formula, Chromium(III) acetyl CAS number, Chromium(III) acetyl supplier information.

Chromium(III) acetate | C6H9CrO6 - PubChem

Using OECD Guideline 301A (new version) (Ready Biodegradability: DOC Die Away Test) with an adapted activated sludge inoculum, chromium (III) acetate (at 40 mg/L) was found to be readily biodegradable with 33.8, 84.5, 89.3 and 91.8% degradation after 1, 3 …

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