Air-potentials

The cathode can of an air -zinc cell has a hole for the air access (the respiratory hole). The substitution of the cathode oxides, which are used in traditional batteries, with air increases capacity and energy density of such a battery. The battery voltage depends first of all on the air potential, which at constant current density and temperature is also constant hence the voltage of an air-zinc battery at the discharge practically does not change. 

The pyrolysis products of expls in tandem with GC/MS served as indirect identification of contaminant expls in the environment. The pyrolysis products generated, which are indicative of the parent molecule, are separated by GC and identified by MS (Ref 108). Red water produced by the sellite purification of crude TNT was analyzed by GC/MS for potentially useful organic compds, 2,4-DNT, 3- and 5-sulfonic acids (Ref 124). The enhanced detection of TNT vapors was achieved by pre-concn on a metal surface, and flash-desorbed onto a chromatograph interfaced with a quadrupole MS (Ref 76). Vapors of TNT, acetone, toluene, cyclohexanone, and an organosilicon were detected and identified by GC/MS (Ref 78). Various reports were surveyed to determine which methods, including GC/MS, aire potential candidates for the detection of traces of TNT emitted from military land-mines (Ref 80) The vapors collected from Comp B were analyzed by GC/MS besides the TNT and RDX, H20, N20, C02, plus several unidentified compds, were detected (Ref 79). By the use of GC, isomeric impurities in the vapor, as well as solid phase of TNT, were resolved and identified by MS (Refs 61,62 115)... 

SAFETY PROFILE Suspected carcinogen. Taken internally as Th02, it has proven to be carcinogenic due to its radioactivity. On an acute basis it has caused dermatitis. Flammable in the form of dust when exposed to heat or flame, or by chemical reaction with oxidizers. The powder may ignite spontaneously in air. Potentially hazardous reactions with chlorine, fluorine, bromine, oxygen, phosphorus, silver, sulfur, air, nitryl fluoride, peroxyformic acid. 

Ariya P. A., Hopper J. F., and Harris G. W. (1999) C2-C7 hydrocarbon concentrations in Arctic snowpack interstitial air potential presence of active Br within the snowpack. J. Atmos. Chem. 34, 55—64. 

Confusion often occurs with the use of the terms exposure , concentration , and dose . Dose is the amount of contaminant that is deposited or absorbed in the body of an exposed individual over a specific duration. Dose occurs as a result of exposure. Concentration is that level of contaminant present in the air potentially available to be inhaled. The atmospheric concentration of a chemical by itself does not define the total dose of a chemical delivered or the specific sites of potential injury. For a substance present in inhaled air to be toxic, a significant dose must first be removed from the inhaled air and be deposited on sensitive tissue. Knowledge of the dose to initial target sites provides a critical link between exposure and the subsequent biological response. Understanding the disposition of inhaled xenobiotics is complex and, due to space limitations, cannot be described in detail here. However, certain basic concepts need to be presented to provide information on the various factors related to exposure, dose, and response that are fundamental to understanding the potential human risk from inhaled chemical agents. 

Incompatibilities and Reactivities None reported [Note Spontaneously combustible in high concentrations in air. Potential exposure to gaseous PF when polyphosphinates are heated above 392°F.] ... 

Properties Colorless clear volatile llq. sweet alcohol odor sol. In water, methanol, diethyl ether, chloroform, acetone m.w. 46.08 sp.gr. 0.789 (20 C) m.p. -114 C b.p. 78 C flash pt. (CC) 13 C Toxicology TLV 1000 ppm In air potentially poisonous by Ingestion Precaution Flamm. llq. fire hazard mod. explosion hazard NFPA , Flammability 3, Reactivity 0 Storage Hygroscopic... 

Toxicology LD50 (oral, rat) > 20 g/kg irritating to eyes, skin, mucous membranes, upper respiratory tract may be harmful by inh., ing., or skin absorp. TSCA listed Precaution Flamm. vapor may flash back incompat. with strong acids/bases/oxidizers container explosion can occur may dec. to form flamm./explosive mixts. in air potentially explosive protect against static discharges Hazardous Decomp. Prods. Toxic fumes of CO, CO2, silicon oxide emits toxic fumes underfire conditions... 

Precaution DOT Dangerous when wet violent reactions with water, NaOH + H2, etc. flamm. exposed to heat or flame powd. ignites spontaneously in air potentially explosive with water, sulfur dioxide, etc. incompat. with halogens, glycerin, etc. 

NOx emissions did not decrease with the cofiring. Experimentation showed that the transport air potentially overcame the... 

FIGURE 11.8 Pt distribution maps in three MEAs (left anode right cathode) (a) fresh, (b) N2 potential cycled, and (c) H2/air potential cycled [69]. 

Physical properties of matter are those that ean be measured without altering the ehemieal eomposition of the matter. A typieal physical property is eolor, which can be observed without changing matter at all. Malleability of metals, the degree to whieh they ean be pounded into thin sheets, eertainly alters the shape of an object but does not ehange it chemically. On the other hand, observation of a chemical property, sueh as whether sugar bums when ignited in air, potentially involves a eomplete ehange in the chemical composition of the substance tested. 

Lifetime extension of FeCrAIRE alloys in air. Potential role of enhanced Al reservoir and surface pre-treatment (SMILER)... 

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