Nitrogen dioxide
Nitrogen dioxide | |
| Formula | NO2 |
| Structure | |
| Description | Red to brown gas above 21.1 Deg c; brown liquid below 21.1 Deg c; irritating odor. |
| Uses | Has been used to bleach flour, in nitration of organic compound & explosives, manufacture of oxidized cellulose compound (hemostatic cotton). |
| Registry Numbers and Inventories. | |
| CAS | 10102-44-0 |
| EC (EINECS/ELINCS) | 233-272-6 |
| EC Index Number | 007-002-00-0 |
| EC Class | Very toxic; Corrosive |
| RTECS | QW9800000 |
| RTECS class | Mutagen; Reproductive Effector; Human Data |
| UN (DOT) | 1067 |
| Merck | 12,6700 |
| Beilstein/Gmelin | 805 (G) |
| RCRA | P078 |
| Swiss Giftliste 1 | G-2881 |
| Canada DSL/NDSL | DSL |
| US TSCA | Listed |
| Austrailia AICS | Listed |
| New Zealand | Listed |
| Japan ENCS (MITI) | Listed |
| Korea ECL | Listed |
| Properties. | |
| Formula | N2O |
| Formula mass | 46.01 |
| Melting point, °C | -101 |
| Boiling point, °C | 21.2 |
| Vapor pressure, mmHg | 659 (-90.81 C) |
| Vapor density (air=1) | 1.58 |
| Critical temperature | 157.8 |
| Critical pressure | 99.96 |
| Density | 1.4494 g/cm3 (20 C) |
| Solubility in water | Reacts |
| Viscosity | 0.01441 cp (15 C) |
| Thermal expansion | 0.0037026/K |
| Heat of fusion | 6.54 kJ/mol |
| Heat of vaporization | 38.1 kJ/mol |
| Hazards and Protection. | |
| Storage | Corrosive to steel when wet, but may be stored in steel cylinders when moisture content is 0.1% Or less store in a cool, dry, well-ventilated location. Separate from oxidizable materials. Outside or detached storage is preferred. |
| Handling | All chemicals should be considered hazardous. Avoid direct physical contact. Use appropriate, approved safety equipment. Untrained individuals should not handle this chemical or its container. Handling should occur in a chemical fume hood. |
| Protection | Wear appropriate protective gloves, clothing and goggles. |
| Respirators | Wear positive pressure self-contained breathing apparatus (SCBA). |
| Small spills/leaks | Do not touch or walk through spilled material. Fully encapsulating, vapor protective clothing should be worn for spills and leaks with no fire. Stop leak if you can do it without risk or turn leaking containers so that gas escapes rather than liquid. Do not direct water at spill or source of leak. Isolate area until gas has dispersed. Ventilate the area. |
| Stability | May form explosive mixtures with combustible materials. Reactive only under extreme conditions. |
| Decomposition | When heated to decomposition it emits toxic fumes of oxides of nitrogen. |
| Fire. | ||||
| Fire fighting | To extinguish, use media most appropriate for surrounding fire. | |||
| Fire potential | Nonflammable but can support combustion. | |||
| Hazards | Vapors from liquefied gas are initially heavier than air and spread along ground. Containers may explode when heated. | |||
| Combustion products | Fire will produce irritating, corrosive and/or toxic gases. | |||
| NFPA | Health | 3 | ||
| Flammability | 0 | |||
| Reactivity | 0 | |||
| Special | O | |||
| Health. | |
| Exposure limit(s) | TLV (as TWA): 3 ppm; 5.6 mg/m3; (as STEL): 5 ppm; 9.4 mg/m3 (ACGIH 1996). OSHA PEL: C 5 ppm (9 mg/m3) NIOSH REL: ST 1 ppm (1.8 mg/m3) NIOSH IDLH: 20 ppm |
| Poison_Class | 2 |
| Exposure effects | Dyspnea and weak, rapid pulse may develop after a delay of several hours. Fatigue, restlessness, anxiety, mental confusion, lethargy, and loss of consciousness may be noted. Nitrogen dioxide has been fetotoxic in rats and affected behavior and growth statistics in newborn mice. Methemoglobin inducers are considered harmful to the fetus. |
| Ingestion | Nausea and abdominal pain may be seen. |
| Inhalation | May be fatal if inhaled. Causes irritation/burns. |
| Skin | Nitric oxide is a skin irritant. |
| Eyes | Inflammation of the eye would be expected under conditions where nitrogen dioxide would be formed. The liquid may cause severe burns. |
First aid | |
| Ingestion | Do not induce emesis - dilution: following ingestion and/or prior to gastric evacuation, immediately dilute with 4 to 8 ounces (120 to 240 ml) of milk or water (not to exceed 15 ml/kg in a child). The possible benefit of early removal of some ingested material by cautious gastric lavage must be weighed against potential complications of bleeding or perforation. |
| Inhalation | Move patient to fresh air. Monitor for respiratory distress. If cough or difficulty breathing develops, evaluate for respiratory tract irritation, bronchitis, or pneumonitis. Administer oxygen and assist ventilation as required. Treat bronchospasm with beta2 agonist and corticosteroid aerosols. |
| Skin | Remove and isolate contaminated clothing and shoes. Immediately flush with running water for at least 20 minutes. In case of contact with liquefied gas, thaw frosted parts with lukewarm water. Effects may be delayed. |
| Eyes | Immediately flush with running water for at least 20 minutes. Effects may be delayed. |
| Transport. | ||
| UN number | 1067 |  |
| Response guide | 124 | |
| Hazard class | 2.3 | |
| PRTC | T | |
| USCG CHRIS Code | NDO, NOX | |