National Toxicology Program

National Toxicology Program

CAS Registry Number: 26628-22-8 (Sodium azide)

http://ntp.niehs.nih.gov/go/21315

Selected information from two of the National Library of Medicine's databases: ChemIDPlus1 and HSDB2.

Structure

Chemical Structure for Chemical Abstracts Service Registry Number 26628-22-8 from NLM

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Chemical Properties2

Property Description
Color/Form
  • Colorless hexagonal crystals
  • Colorless to white, crystalline solid
Odor
  • Odorless
Taste
  • None found
Boiling Point
  • None found
Melting Point
  • 275 deg C (decomp)
Molecular Weight
  • 65.010
Corrosivity
  • VERY CORROSIVE TO ALUMINUM, MODERATE TO COPPER & LEAD
Critical Temperature & Pressure
  • None found
Density/Specific Gravity
  • 1.846 @ 20 DEG C
Disassociation Constants
  • pK= 4.8, aq solns contains NH3 which escapes readily at 37 deg C.
Heat of Combustion
  • None found
Heat of Vaporization
  • None found
log P (octanol-water)
  • None found
pH
  • None found
Solubilities
  • Slightly soluble in ethanol, insoluble in ethyl ether
  • Insol in ether; sol in liq ammonia
  • Sol 40.16% @ 10 deg C, and 41.7% @ 17 deg C in water
  • Slightly sol in alcohol @ 25 deg C
  • In water, 41.0 g/100 ml @15 deg C
Spectral Properties
  • None found
Surface Tension
  • None found
Vapor Density
  • None found
Vapor Pressure
  • 1 Pa @ 20 deg C
Relative Evaporation Rate
  • None found
Viscosity
  • None found
Other Properties
  • DECOMP @ 275 DEG C TO SODIUM AND NITROGEN. DECOMP IN VACUUM.
  • Sodium azide reacts vigorously with water.
  • Thermal decomposition occurs at 300 deg C with formation of sodium metal and nitrogen.

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Uses2

  • ... In the prepn of hydrazoic acid, lead azide, pure sodium.
  • Herbicide, fungicide, nematocide, soil fumigant
  • PREPLANT INCORPORATION: THIS MODE OF APPLICATION ... USED WITH THE HIGHER LEVELS OF SODIUM AZIDE FOR BROAD-SPECTRUM WEED CONTROL & GENERAL "FUMIGANT" ACTION AGAINST SOIL MICROORGANISMS & INSECTS. ... POSTEMERGENCE: AQ SPRAY ... USED TO DEFOLIATE COTTON & AS A DIRECT TREATMENT TO CONTROL WEEDS IN TOLERANT CROPS.
  • FOR CONTROL OF AQUATIC WEEDS IN RICE; FOR CONTROL OF DISEASES IN PEANUTS, TOMATOES, GREEN BEANS, STRAWBERRIES, ORNAMENTALS, & MANY OTHER FRUIT & VEGETABLE CROPS; FOR SOIL FUMIGATION & TURF RENOVATION.
  • SODIUM AZIDE IS A BROAD-SPECTRUM BIOCIDE, SHOWING FUNGICIDAL, BACTERICIDAL, NEMATICIDAL & INSECTICIDAL ACTIVITY.
  • Intermediate in organic synthesis
  • ... Used for stabilization of aqueous prealbumin in fractions (isolated from human serum) during storage....
  • ... The preparation of human blood samples for analysis of acetaldehyde and ethanol ... .
  • ... Enhancement of interleukin-2 production.
  • A /diagnostic/ method using sodium azide ... is proposed as a new and simple means of measuring tocopherol deficiency in erythrocyte membranes.
  • As preservative for laboratory reagents ... As propellant for inflating automotive safety bags.
  • One of the reagents required for the determination of dissolved oxygen in polluted water is a soln of sodium azide in 50% sulfuric acid.
  • The chemical industry has used sodium azide as a retarder in the manufacture of sponge rubber, to prevent coagulation of styrene and butadiene latexes stored in contact with metals, and to decompose nitrites in the presence of nitrates.
  • Used as a preservative for seeds and wine; used by lumber industry to limit the growth of enzymes responsible for formation of brown stain on sugar pine; used by Japanese beer industry to prevent growth of a fungus which darkens its product
  • Air-bag inflation, preservative in diagnostic medicinals, intermediate in explosive manufacture
  • ... Starting material for other metal azides. ... Used in automobile safety devices, e.g. steering-wheel air bags ... .
  • Used in the Curtis reaction for the production of amines.
  • Sensitive probe for studies of the electrostatic interactions between charged sites in myoglobin.
  • ... Preservative found in manufactured antisera.
  • PRESERVATIVE IN DIAGNOSTIC MEDICINALS

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Superlist Classes1

  • Ceiling 0.29 mg/m3 as sodium azide; Not classifiable as a human carcinogen
  • Ceiling (0.11 ppm as hydrazoic acid vapor); Not classifiable as a human carcinogen
  • Reportable Quantity (RQ) = 1000 lb
  • Threshold Planning Quantity (TPQ) = 500 lb

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Notes (Sources: NTP,HSDB,RTECS,MESH)1

  • None found

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Other Registry Numbers1

  • 108592-00-3
  • 12136-89-9
  • 157302-08-4
  • 20828-18-6
  • 503002-54-8
  • 575502-02-2

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Synonyms (Sources: NTP, HSDB,RTECS,MESH)1

  • U-3886
  • Azide, sodium
  • HSDB 695
  • Hydrazoic acid, sodium salt
  • Kazoe
  • NCI-C06462
  • Nemazyd
  • NSC 3072
  • RCRA waste number P105
  • Smite

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Links to Additional Information1

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Footnotes

1 Source: the National Library of Medicine's ChemIDPlus, 04/28/2013.

2 Source: the National Library of Medicine's Hazardous Substance Database, 11/28/2012.

The NTP is administratively located at the National Institute of Environmental Health Sciences, part of the National Institutes of Health.

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