Dichromate permanganate

Dichromate-permanganate determination is an artificial problem because the matrix of coefficients can be obtained as the slopes of A vs. x from four univariate least squares regression treatments, one on solutions containing only at... 

Electroless nickel-phosphorus should not be used with either fused or hot, strong, aqueous caustic solutions because the coating offers lower resistance to attack than does electrodeposited nickel. As-deposited electroless nickel-boron, however, offers good resistance to hot aqueous caustic solutions It is also resistant to solutions of oxidising salts such as potassium dichromate, permanganate, chlorate and nitrate. 

Wet oxidation Several types of liquid-phase oxidizing agents, such as nitric acid, acidic potassium permanganate, acidic potassium dichromate, dichromate permanganate, hydrogen peroxide, ammonium bicarbonate and potassium persulfate, have... 

Chromate, dichromate, permanganate, chlorate and hypochlorite and other oxidants are readily reduced hy hydrazine for example, removal of chromate from wastewater may he achieved fuUy hy converting water-soluhle chromate to insoluble precipitate of chromium hydroxide, Cr(OH)3 ... 

The most common oxidation agent is air, but oxygen is frequently used. Chemical oxidizing agents (nitric acid, dichromates, permanganates, chromic anhydride, chlorates, and hydrogen peroxide) are also often used. 

V.18 PRELIMINARY TESTS FOR AND SEPARATION OF CERTAIN ANIONS After the systematic separation and detection of cations, the search for anions should be started. At this stage already considerable information is available about the presence or absence of certain anions. Not only the preliminary wet and dry tests supplied this information, but during the separation of cations a number of facts became available thus the presence of phosphate, borate, fluoride, citrate, tartrate, and oxalate has been detected, before the precipitation of Group III cations. Similarly, the presence of chromate (or dichromate), permanganate and arsenate has been established at various stages of these separations. When the systematic examination for anions is carried out, such findings should be kept in mind. 

As can be seen by inspection, there are only a few oxidising agents that are likely to be suitable for making a solvent bleach dichromate, permanganate, persulfate and hydrogen peroxide. The last two in the list are very poor bleaching agents as their oxidation appears to be kinetically hindered. They can only be used in the presence of a suitable catalyst, which will be described later. 

Others, like acid dichromate, permanganate, LiAlH4, and catalytic hydrogenation, are much more versatile. 

Hexavalent plutonium is obtained by the action of strong oxidizing agents (ceric salts, dichromates, permanganates, or hot bromate soln contg nitric acid) on the tri - Or tetravalent form. Reduced to tri- or tetravalent plutonium by sulfur dioxide or ferrocyanide. 

More drastic oxidation of the ethylenic bonds of oleic, linoleic, and similar unsaturated fatty acids causes the action to go beyond the formation of oxygenated groups and to result in rupture of the bond as well as in oxidation. Such agents as the dichromates, permanganates, and nitric acid may be used to obtain the effect. Thus, oleic, dihydroxystearic, and sterolic acids yield azelaic and pelargonic acids, products that may be further oxidized if the reaction is forced. 

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