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Diss Factsheets
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EC number: 247-852-1 | CAS number: 26628-22-8
- Life Cycle description
- Uses advised against
- Endpoint summary
- Appearance / physical state / colour
- Melting point / freezing point
- Boiling point
- Density
- Particle size distribution (Granulometry)
- Vapour pressure
- Partition coefficient
- Water solubility
- Solubility in organic solvents / fat solubility
- Surface tension
- Flash point
- Auto flammability
- Flammability
- Explosiveness
- Oxidising properties
- Oxidation reduction potential
- Stability in organic solvents and identity of relevant degradation products
- Storage stability and reactivity towards container material
- Stability: thermal, sunlight, metals
- pH
- Dissociation constant
- Viscosity
- Additional physico-chemical information
- Additional physico-chemical properties of nanomaterials
- Nanomaterial agglomeration / aggregation
- Nanomaterial crystalline phase
- Nanomaterial crystallite and grain size
- Nanomaterial aspect ratio / shape
- Nanomaterial specific surface area
- Nanomaterial Zeta potential
- Nanomaterial surface chemistry
- Nanomaterial dustiness
- Nanomaterial porosity
- Nanomaterial pour density
- Nanomaterial photocatalytic activity
- Nanomaterial radical formation potential
- Nanomaterial catalytic activity
- Endpoint summary
- Stability
- Biodegradation
- Bioaccumulation
- Transport and distribution
- Environmental data
- Additional information on environmental fate and behaviour
- Ecotoxicological Summary
- Aquatic toxicity
- Endpoint summary
- Short-term toxicity to fish
- Long-term toxicity to fish
- Short-term toxicity to aquatic invertebrates
- Long-term toxicity to aquatic invertebrates
- Toxicity to aquatic algae and cyanobacteria
- Toxicity to aquatic plants other than algae
- Toxicity to microorganisms
- Endocrine disrupter testing in aquatic vertebrates – in vivo
- Toxicity to other aquatic organisms
- Sediment toxicity
- Terrestrial toxicity
- Biological effects monitoring
- Biotransformation and kinetics
- Additional ecotoxological information
- Toxicological Summary
- Toxicokinetics, metabolism and distribution
- Acute Toxicity
- Irritation / corrosion
- Sensitisation
- Repeated dose toxicity
- Genetic toxicity
- Carcinogenicity
- Toxicity to reproduction
- Specific investigations
- Exposure related observations in humans
- Toxic effects on livestock and pets
- Additional toxicological data
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Other distribution data
Administrative data
- Endpoint:
- other distribution data
- Type of information:
- experimental study
- Adequacy of study:
- supporting study
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- comparable to guideline study with acceptable restrictions
Data source
Reference
- Reference Type:
- review article or handbook
- Title:
- Dissipation and phytotoxicity of sodium azide in soil.
- Author:
- Ketchersid M.L., Merkle M.G.
- Year:
- 1 976
- Bibliographic source:
- Weed Science 24: 312-315.
- Report date:
- 1976
Materials and methods
Test guideline
- Qualifier:
- equivalent or similar to guideline
- Guideline:
- OECD Guideline 312 (Leaching in Soil Columns)
- Deviations:
- yes
- Remarks:
- : no reference substance, only 1 soil, lower amount of artificial rain applied
- GLP compliance:
- no
- Type of study:
- soil leaching
- Media:
- water - soil
Test material
- Reference substance name:
- Sodium azide
- EC Number:
- 247-852-1
- EC Name:
- Sodium azide
- Cas Number:
- 26628-22-8
- Molecular formula:
- N3Na
- IUPAC Name:
- sodium azide
Constituent 1
Results and discussion
Any other information on results incl. tables
There was no difference in leaching pattern when leaching the equivalent of 112 kg/ha of Sodium azide through soil with pH values of 5.5 and 8.0; in both cases almost 50 % of the azide remained in the top 2.5 cm and almost 75 % remained in the top 5.0 cm (Table 1). The azide did not move as a band with the water front but gradually spread into the soil with the water. All of the herbicide applied to alkaline soil could be accounted for while 15.7 % was lost in the acid soil presumably due mainly to vapor losses.
Table 1. Percentages of Sodium azide recovered at various depths of Lufkinfine sandy loam soil 1 hr after surface application of 112 kg/ha followed by a 1.3 cm simulated rainfall.
Section analyzed (cm) |
Soil pH |
|
5.5 |
8.0 |
|
0.0-2.5 |
45.4 a |
47.6 a |
2.5-5.0 |
26.7 b |
26.4 b |
5.0-7.6 |
9.4 cd |
16.7 be |
7.6-10.2 |
2.1 cd |
7.3 cd |
10.2-12.7 |
0.6 d |
2.5 cd |
12.7-15.2 |
0.1 d |
0.8 d |
total detected |
84.3 |
101.3 |
Values followed by the same letter are not significantly different at the 1 % level using Duncan's multiple range test.
Applicant's summary and conclusion
- Conclusions:
- The degree of leaching was not affected by pH.
- Executive summary:
Sodium azide is used as a non-selective, broad spectrum herbicide effective against both annual and perennial weeds. The biological activity of azides has been shown to arise from liberation of undissociated hydrazoic acid, which is dependent on soil pH. This study was conducted to compare the degree of leaching of sodium azide applied as 15 % granular formulation from acid and alkaline soil.
The results show no difference in leaching pattern when leaching the equivalent of 112 kg/ha of Sodium azide through soil with pH values of 5.5 and 8.0; in both cases, almost 50 % remained in the top 2.5 cm and almost 75 % in the top 5 cm. All of the Sodium azide applied to alkaline soil could be recovered while 15.7 % were lost in the acid soil. This was ascribed to vapor losses of Sodium azide after hydrolysis to hydrazoic acid.
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