Noxious vapor

Scbwaden, m. noxious vapor or exhalation, damp specif., choke damp gas cloud smoke cloud swath. — feurlger —, fire damp. 

Cautionl Parts A and B of this procedure should be carried out in an efficient hood to avoid exposure to noxious vapors (acetic add, ammonia). 

For some applications, an adsorbent may be impregnated with a material that enhances its contaminant-removal ability. The improved effectiveness may be related to any of several mechanisms. The impregnating material may react with the vapor contaminant to form a compound or complex that remains on the adsorbent surface. Some impregnants react with the contaminant, or catalyze reactions of the contaminant with other gas constituents, to form less noxious vapor-phase substances. In some instances, the impregnant acts as a catalyst intermittently, for example, under regeneration conditions. In this case, the contaminant is adsorbed by physical adsorption and destroyed by a catalytic reaction during regeneration. 

Detn of small quantities of aromatic nitrocompds in air using colorimetric and nephelometric methods) 6)J.B.Ficklen, "Manual of Industrial Health Hazards, Service to Industry, West Hartford, Connecticut (l940)(Iududed are methods for detn of over 90 noxious vapors, gases and dusts) 7)K-... 

Caution The following reactions should he performed in an efficient hood to protect the experimentalist from noxious vapors (pyrrolidine, phosphorus oxychloride, and triethylamine). 

Z Anal Chem 113,182-9(1938) CA 32,7858 (19 38)(Colorimetric procedure using dimethyl-aniline for detg small quantities of cnioro-picrin in air, water, etc) 5)l.S.Shereshev-skava. PromOreKhim Industrial Health Hazards, Service to Industry, West Hartford, Connecticut (1940)(Included are methods for detn of over 90 noxious Vapors, gases ana dusts) 7)K. Kay, Can J Res 196,86-9(1941) CA 35,3562... 

When smoke formation accompanies traces of noxious vapors, it may be called a fume—for example, a metallic oxide developing with sulfur in a melting or smelting process. The term fume is also used in a more general way to describe a particle cloud resulting from mixing and chemical reactions of vapors diffusing from the surface of a pool of liquid. 

Any chemistry laboratory is a place that has many sources of hazards, including explosive, toxic or flammable chemicals, noxious vapors, broken glass, and hot liquids and solids. In addition to the rules given below, good practice requires that the instructor and student review each experiment for all potential hazards and discuss steps to avoid or mitigate such hazards. The review should include considerations of dangerous chemicals and conditions in each experiment. 

Other general applications have included catalyst carriers and decolorizing for gold recovery from cyanide leach solutions. Of particular interest is its effective use for military and industrial clothing where protection from noxious vapors is necessary. Recent studies have shown its ability to separate chemical isomers, such as the separation of dioxin isomers. It has been used worldwide for analytical methods for determining trace (PPB) toxic substances in water,... 

Likewise, in industrial countries, increasingly stringent regulations limit noxious vapor discharge from chemical plants, which are required to treat their effluents effectively. The transport of dangerous substances is also closely monitored by the authorities. Such precautions stem not only from the publicity which the media now gives to any catastrophe worldwide, but also from the public s instinctive distrust of chemistry, which it still regards as a mysterious science. 

Erskine et al. (1993) measured the threshold concentration of ammonia required to elicit reflex glottis closure, which is a protective response stimulated by inhaling irritant or noxious vapors at concentrations too small to produce cough. Glottis closure was measured in 102 healthy nonsmoking subjects between the ages of 17 and 96. The results showed a strong correlation between age... 

Tank (pressure vessel) filters are useful where noxious vapors are involved, and a completely closed system is desirable. Pressure vessel filters are divided into the following types ... 

The polymerization process of cyanoacrylates is so fast that it can react with the water present on skin, causing it to bond skin instantly. As such, it should be handled with extreme care, because a small amount rubbed in the eye can instantly bond eyelids shut. It causes irritation of the nose, throat, and lungs from the noxious vapors of the acrylate monomer. There are different commercially available chemical variants that have slightly different setting properties and viscosities depending upon the application. 

Pressure vessel Alters are useful where noxious vapors are involved, and a completely closed system is desirable. 

The principle of the gas mask is employed to eliminate odors and noxious vapors from living and working spaces. Such use has gained... 

We can expect that there will be increasing public pressure on governmental bodies at all levels—local, state, and federal—to provide measures to reduce atmospheric pollution. All of which will present purification engineers with many new problems. Many situations will be handled by existing types of carbon adsorbers others may necessitate an extension of the gas mask principle to include the use of activated carbon to catalyze the destruction of noxious vapors by chemical change. We can expect, however, to encounter situations for which the gas mask principle in any form may be inadequate or even unsuitable, and it will be necessary then to supplement or even substitute the use of carbon by other methods of purification. 

Hazardous Decomp. Prods. Thermai decomp. yieidsCO, CO2, and other noxious vapors... 

Similarly, operation under vacuum not only provides excellent cooling but simultaneously prevents escape of noxious vapors and eliminates the need for hydrochloric acid-vapor blowers, plus their attendant cost and maintenance charges. A reduced pressure of 250-330 mm of mercury and a corresponding slurry temperature of 75 -80°C represent typical operating conditions. 

In this case, we believe that the out-of-control excursion was caused by a batch of raw material that met written specifications but was not suitable for the then-current operating parameters, which had been changed in recent months. When the new raw material hit the reactor, the process overheated and blew a rupture disk inside a process building. Several anploy-ees were exposed to noxious vapors and were treated for their symptoms. 

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