Odors oxidative

Properties Crystals with unpleasant odor. Oxidizes on contact with air. Mp 97C. Soluble in water. Combustible. 

Properties Water-white liquid offensive odor. Oxidizes on exposure to air supplied under nitrogen atmosphere. D 1.080 (15.5/15.5C), refr index 1.5815 (25C), fp—15C, bp 169C. Insoluble in water very soluble in aromatic and aliphatic hydrocarbons. Hazard Store out of contact with air and acids. Toxic by inhalation. TLV 0.5 ppm. 

Yellow powder odorless or slight odor. Oxidizes in air, becoming darker and more toxic higher temps accelerate the oxidation hence marketed in air-evacuated ampuls or filled with a nonoxidizing gas. Very sol in water sol in glycerol. Slightly sol in alcohol or acetone. Practically insol in chloroform, ether. Its aq soln is practically neutral, unlike arsphenamine, which Is acid. LDH i.v, in rats 300 mg/kg. 

White or grayish -white, cryst powder slight characteristic odor. Oxidizes in air more readily so in presence of moisture or when in soln) to bisulfite and bisulfate and acquires an acid reaction. Very sol in water, slightly in alcohol. 

Properties Colorless volatile liq. or needles musty odor oxidizes in air sol. in alcohol, benzene, chloroform, acetone, CCU, chlorinated and aromatic soivs. insol. in water m.w. 170.75 dens. 

The feed gas CCI4 is a colorless nonflammable liquid that has a characteristic odor. Oxidative decomposition by flame causes phosgene and HCl to form. Carbon tetrachloride has been identified as a human carcinogen and an insidious property is its high percutaneous absorption. The TLV is 5 ppm and the IDLH is 300 ppm. Excessive exposure results in central... 

Time of storage facilitates migration to the surface and decreases the coefficient of friction. The influence of contact with liquids and solids may remove a sufficient amount of slip agent from the surface of material to increase the coefficient of friction (see Figures 5.9, 5.10, and 7.11). Slip agent present in polyethylene used in food-contact was found to leach odorous oxidation products. Optical properties of polyethylene films were affected by several antiblocking agents but not by erucamide. ... 

Terpene-based resins are obtained from turpentine sulfate, a byproduct of the paper industry, and from limonene, a product of the citrus industry. Products obtained are alpha-pinene, beta-pinene, and dipentene. The alpha-pinenes are apparently the preferred product for hot melt adhesives as they are the most compatible with EVA copolymers. Adhesives compounded with dipentenes have excellent color and thermal stability, odor, oxidation resistance and hot tack properties. Typical of the products available in this class are the Piccolyte series of resins (Hercules). Limonene-based products are exemplified by Zonatac 105 (Arizona Chemicals). 

The element is a steel gray, very brittle, crystalline, semimetallic solid it tarnishes in air, and when heated is rapidly oxidized to arsenous oxide with the odor of garlic. Arsenic and its compounds are poisonous. 

Physical Properties. Tetrahydrofurfuryl alcohol (2-tetrahydrofuranmethanol) [97-99-4] (20) is a colorless, high-boiling liquid with a mild, pleasant odor. It is completely miscible with water and common organic solvents. Tetrahydrofurfuryl alcohol is an excellent solvent, moderately hydrogen-bonded, essentially nontoxic, biodegradable, and has a low photochemical oxidation potential. Most appHcations make use of its high solvency. The more important physical properties of tetrahydrofurfuryl alcohol are Hsted in Table 1. 

With a special (usually oxidized or heated) odor, the result of treatment or aging ( d) Without film yeast involvement... 

Analysis of Trace or Minor Components. Minor or trace components may have a significant impact on quaHty of fats and oils (94). Metals, for example, can cataly2e the oxidative degradation of unsaturated oils which results in off-flavors, odors, and polymeri2ation. A large number of techniques such as wet chemical analysis, atomic absorption, atomic emission, and polarography are available for analysis of metals. Heavy metals, iron, copper, nickel, and chromium are elements that have received the most attention. Phosphoms may also be detectable and is a measure of phosphoHpids and phosphoms-containing acids or salts. 

Another modification of this process was reported in 1988 (84). In this process, a precondensate of THPC and urea, plus excess urea, are neutralized to a pH of about 5.7, and the buffer salt is added. The fabric is then given a standard pad-dry-cure process followed by oxidation and laundering. The principal advantage of this modification is a reduction in both formaldehyde vapors and phosphine-like odors released during processing (84). 

Hydrazine [302-01-2] (diamide), N2H4, a colorless liquid having an ammoniacal odor, is the simplest diamine and unique in its class because of the N—N bond. It was first prepared in 1887 by Curtius as the sulfate salt from diazoacetic ester. Thiele (1893) suggested that the oxidation of ammonia (qv) with hypochlorite should yield hydrazine and in 1906 Raschig demonstrated this process, variations of which constitute the chief commercial methods of manufacture in the 1990s. 

Mesityl Oxide. Mesityl oxide (MSO) (4-metliyl-3-penten-2-one) is an oily colorless liquid with an unpleasant odor. It exhibits the versatiUty and unusual reactivity associated with conjugated a,P unsaturated carbonyl compounds (172). On standing ia air, mesityl oxide slowly forms bis(3,5,5-trimethyl-l,2-dioxolanyl)-3-peroxide (173). 

Methanol [67-56-1] (methyl alcohol), CH OH, is a colorless Hquid at ambient temperatures with a mild, characteristic alcohol odor. Originally called wood alcohol siace it was obtained from the destmctive distillation of wood, today commercial methanol is sometimes referred to as synthetic methanol because it is produced from synthesis gas, a mixture of hydrogen and carbon oxides, generated by a variety of sources. 

Nickel acetate tetrahydrate [6018-89-9] Ni(C2H202) 4H2O, is a green powder which has an acetic acid odor, density 1.74 g/cm. When heated, it loses its water of crystallization and then decomposes to form nickel oxide. Nickel acetate is used as a catalyst intermediate, as an intermediate in the formation of other nickel compounds, as a dye mordant, as a sealer for anodized aluminum, and in nickel electroplating (59). 

It is unlikely that two odors when combined will cancel each other and result in no odor, ie, 1 + 1 = 0 there is always some residual odor. However, reduction of an odor by an oxidation process can destroy the odor molecule permanently and leave no residual odor. 

Of all these, probably P-phenethyl alcohol (2) comes closest to the odor of fresh rose petals however, mixing all these components does not reproduce the total fine character of the natural oil. It has been determined that a number of trace constituents representing less than 1% of the volatiles are critical to the development of the complete rose fragrance (10). These include cis- and trans-i.ose oxide (1), nerol oxide (12), rose furan (13), /)i7n7-menth-l-en-9-al (14), P-ionone (15), P-damascone (16), and P-damascenone (3). 

In 1961, chemists (19) isolated a minor component of geranium oil, characterized it as rose oxide (1), and reported that this compound contributed to the characteristic geranium odor. Rose oxide (1) is manufactured by the photooxidation of citroneUol (8). 

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