Cylinders nitrogen dioxide

Gaseous nitrogen dioxide is a brown, paramagnetic, non-flammable, toxic, strongly oxidizing, coiTosive substance shipped in approved, low-pressure steel cylinders. It is prepared in situ by heating lead nitrate ... 

FIGURE 7.2 A gas spontaneously fills its container. A glass cylinder containing the brown gas nitrogen dioxide (upper piece of glassware in the top illustration) is attached to an evacuated flask. When the stopcock between them is opened, the gas spontaneously fills both upper and lower vessels (bottom illustration). The reverse process, in which the gas now in both vessels collects spontaneously back in the upper vessel, does not occur. 

Burkhardt, M. R N. I. Maniga, D. H. Stedman, and R. J. Paur, Gas Chromatographic Method for Measuring Nitrogen Dioxide and Peroxyacetyl Nitrate in Air without Compressed Gas Cylinders, Anal. Chem., 60, 816-819 (1988). 

Nitric Oxide Pass 550 50 mL of sample gas, released from the vapor phase of the contents of the sample gas cylinder, through a nitric oxide-nitrogen dioxide detector tube at the rate specified for the tube. The indicator change corresponds to not more than 1 ppm, by volume. 

NITROGEN (liquid, refrigerated) nitrogen chloride NITROGEN DIOXIDE (cylinder) nitrogen monoxide (cylinder) NITROGEN MONOXIDE (cylinder)... 

Nitrogen dioxide is not combustible (NFPA rating = 0) but is a strong oxidizing agent and will support combustion. Cylinders of NO2 gas exposed to fire or intense heat may vent rapidly or explode. 

Because of its high acute toxicity, nitrogen dioxide should be handled using the "basic prudent practices" of Chapter 5.C, supplemented by the additional precautions for work with compounds of high toxicity (Chapter 5.D) and compressed gases (Chapter 5.H). In particular, cylinders of nitrogen dioxide should be stored and used in a continuously ventilated gas cabinet or fume hood. 

In the event of a release of nitrogen dioxide, use appropriate protective equipment and clothing. Positive pressure air-supplied respiratory protection may be required in cases involving a large release of nitrogen dioxide gas. If a cylinder is the source of the leak and the leak cannot be stopped, remove the leaking cylinder to a fume hood or a safe place, if possible, in the open air, and repair the leak or allow the cylinder to empty. 

Platinum in the Grove cell had been replaced by gas carbon by J. T. Cooper in London. Bunsen used carbon prepared by heating a powdered mixture of coal and coke he tried potassium chlorate or dichromate as a depolariser, but found concentrated nitric acid best. At first he used a carbon cylinder soaked in concentrated nitric acid and put into dilute sulphuric acid containing amalgamated zinc, but he soon used a porous clay pot containing a zinc cylinder in dilute sulphuric acid, outside of which was a carbon cylinder in concentrated nitric acid. In later forms, the nitric acid and a carbon plate were inside the porous pot and a zinc cylinder and dilute sulphuric acid outside it. Batteries of Bunsen cells were used to operate arc lanterns, and since they emitted copious fumes of nitrogen dioxide they were usually put out of doors. 

Nitrogen dioxide is authorized for shipment in DOT/TC approved cylinders and tank cars (ton containers) as a liquefied gas under its own vapor pressure of 14.66 psia (101.1 kPa, abs) at 70°F (21.1°C). Approved cylinders include those of specifications 3A480, 3AA480,... 

Nitrogen monoxide and nitrogen dioxide. The gas cylinder contains colorless nitrogen monoxide, which can be seen as bubbles in the liquid. When the nitrogen monoxide in the bubbles contacts the oxygen in the air, a reaction occurs, producing red-brown nitrogen dioxide. 

Nitric oxide at room temperature is a colorless, nonflammable, toxic gas. Nitric oxide in the presence of air forms brown fumes of nitrogen dioxide, which is extremely reactive and a strong oxidizing agent. The conversion of nitric oxide to nitrogen dioxide is rate dependent on the concentration of oxygen and the square of the concentration of nitric oxide. It also reacts vigorously with fluorine oxides and, when moisture is present, chlorine. Nitric oxide is shipped in a nonliquefied form at a cylinder pressure of 514.7 psia (3549 kPa abs) at 70°F (21.1°C). 

Protect cylinders of nitrogen dioxide from physical damage. Store in a cool, dry, well-ventilated area away from heavily traveled areas and emergency exits. Do not allow the temperature where cylinders are stored to exceed 125°F (51.7°C). Cylinders should be stored upright and firmly secured to prevent falling or being knocked over. Full and empty cylinders should be segregated. Use a first in/first out inventory system to prevent... 

Should it become necessary to dispose of nitrogen dioxide from a leaking cylinder, the following procedure may be used. Move the cylinder to a hood or safe out-of-doors area. 

Attach an appropriate needle valve with a long piece of flexible tubing to the cylinder valve, and run the liquid nitrogen dioxide into excess 5-10 percent aqueous sodium hydroxide solution at a moderate rate. Transfer the resulting solution to the plant disposal unit for neutralizing and disposal. [2], [3], and [4]... 

The standard valve outlet connection in the United States and Canada for nitrogen dioxide cylinders is Connection CGA 660. 

The possibility of obtaining spin-labelled rubbers by interaction of their solutions in the inert solvents with a mixture of nitrogen dioxide and oxygen has been demonstrated in the work [34]. Such rubbers can be prepared simply and rapidly by reactions of block polymeric samples with gaseous NOj [35], The experiments were carried on 1,4-cw-polyisoprene (PI) and copolymer of ethylene, propylene and dicyclopentadiene. The samples had the form of cylinders of 1.5 cm height and 0.4 cm in diameter. On exposure these polymers to NO2 (10 -2.3xl0" molxk ) at 293 K, identical EPR spectra were registered. The spectra represent an anisotropic triplet... 

---