Ferric sulfate peroxide

Eor the cover-coat direct-on process, a ferric sulfate [10028-22-5] Ee2(S0 2> etch is included in the metal pretreatment for rapid metal removal. It is designed to remove ca 20 g/m (2 g/ft ) of iron from the sheet metal surface. Hydrogen peroxide [7722-84-1/, H2O2, is added intermittently to a 1% ferric sulfate solution to reoxidize ferrous sulfate [7720-78-7] EeSO, to ferric sulfate. 

TABLE 2-52 [Fe,(S04)3] Ferric Sulfate TABLE 2-53 [FeCNOala] Ferric Nitrate TABLE 2-58 Hydrogen Fluoride (HF) TABLE 2-59 Hydrogen Peroxide (H O ) ... 

Silver is tarnished by sulfur, sulfur dioxide, and mercury. It also is attacked by ozone, hydrogen peroxide, chromic acid, ferric sulfate, and permanganate solutions. 

ADD HYDROGEN PEROXIDE SOLUTION. LIGHT-GREEN FERROUS SULFATE SOLUTION TURNS REDDISH-BROWN. H,Oj HAS OXIDIZED FeSO TO FERRIC SULFATE (FeJSO, ,). 

Aldoses can be degraded by the following two reactions. First the aldehyde is oxidized with bromine water to form a carboxylic acid. Next the carboxylic acid is decarboxy-lated with hydrogen peroxide and ferric sulfate leaving an aldehyde. The new aldose is one carbon shorter. When glucose is degraded in this manner, and the product is oxidized by dilute nitric acid, an optically active compound is formed. 

The conversion of a-hydroxy acids into aldehydes with one less carbon has great importance in the chemistry of sugars. Oxidation with bromine water transforms aldoses into the corresponding aldonic acids, which, in the form of their calcium salts, are treated with aqueous hydrogen peroxide in the presence of ferrous or ferric sulfate (Fenton reagent) and are degraded to aldoses with one less carbon (Ruff degradation) (equation 479) [57]. 

Dehydrogenation of 2-amino-3,4-dihydroquinoxaline to 2-aminoquinoxaline is effected smoothly by reaction with hydrogen peroxide in combination with a trace amount of ferrous chloride, ferric sulfate, or lead dioxide as carrier. Details are... 

Oxidation of ethylene according to Eq. (9.2) occurs stoichiometrically. A catalytic oxidation is possible if palladium(O) is reoxidized immediately. This happens in the presence of oxidizing agents such as cupric and ferric chlorides ferric sulfate chromates heteropoly acids of phosphoric, molybdic, and vanadic acids peroxides and others. Benzoquinone is used by Moiseev et al. for their kinetic investigations [11]. Gaseous oxygen does not oxidize palladium black in a sufficiently short time. 

Chromium acetate (ic) Copper cyanide Cumene hydroperoxide 1,3-Dibromo-5,5-dimethyl hydantoin Dicumyl peroxide Dimethyl ether Ferric sulfate Ferrous ammonium sulfate Hydrazine Lithium aluminum hydride... 

Two different catalysts for hydrogen peroxide decomposition, the enzyme peroxidase (isolated from the horseradish root, HRP), and polymer-supported catalyst (acid form of poly-4-vinylpyri-dine functionalized by ferric sulfate, apFe) [99,100], are examined with an aim to compare their activity. The active center in the peroxidases is the ferric ion in protoporphyrin IX. Besides the complex made of ferric ion and protoporphyrin IX, that is ferricprotoporphyrin IX, also known as ferric heme or hemin, peroxidase possesses a long chain of proteins [101,102]. On the other hand, the macroporous acid form of polyvinyl pyridine functionalized by ferricsulfate is obtained from cross-linked polyvinyl pyridine in macroporous bead form [103]. Pyridine enables it to form coordination complexes or quaternary salts with different metal ions such as iron (111) [104]. An active center on the polymeric matrix functionalized by iron, as metallic catalyst immobilized on polymer by pyridine, has similar microenvironment conditions as active center in an enzyme [105]. 

Just as the Kiliani—Fischer synthesis can be used to lengthen the chain of an aldose by one carbon atom, the Ruff degradation can be used to shorten the chain by a similar unit. The Ruff degradation involves (1) oxidation of the aldose to an aldonic acid using bromine water and (2) oxidative decarboxylation of the aldonic acid to the next lower aldose using hydrogen peroxide and ferric sulfate. d-(—)-Ribose, for example, can be degraded to D-(—)-erythrose ... 

Ferric sulfate ferrous sulfatelhydrogen peroxide Radical oxidation-reduction... 

The principal value of oxidations with hydrogen peroxide is for the degradation of aldonic acids to sugars with one less carbon atom ferric sulfate is used as a catalyst (see p. 118). It is noteworthy that although ferric salts catalyze this reaction, ferrous salts are used for sugars and ferric salts are not effective. 

Ferric Sulfate 2-4 160 71 B E - E ferrous Sulfate 0-2%. sulfuric acid 0.5%. pH 12. hydrogen peroxide trace, aeration... 

Ferric sulfate/ferrous sulfate hydrogen peroxide Radical oxidation-reduction Azides from ethylene derivatives... 

A number of methods have been proposed for the detection of rancidity. The determination of active oxygen consists of dissolving the fat in a suitable medium such as chloroform and acetic acid, adding potassium iodide, and titrating the liberated iodine with a standard thiosulfate solution (16, 20). This is perhaps the most widely used method at the present time. Another procedure which has been proposed for the detection of peroxides employs ferrous ammonium sulfate and ammonium thiocyanate in acetone. The resulting red color of ferric thiocyanate is measured spectrophotometrically, and is said by the authors to yield more reproducible results than do the usual titration methods (21). 

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