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EC number: 204-310-9 | CAS number: 119-27-7
- 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
Phototransformation in water
Administrative data
Link to relevant study record(s)
- Endpoint:
- phototransformation in water
- Type of information:
- experimental study
- Adequacy of study:
- weight of evidence
- Study period:
- September 2014
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- guideline study without detailed documentation
- Qualifier:
- according to guideline
- Guideline:
- other: ASTM Method E 896-92
- GLP compliance:
- not specified
- Specific details on test material used for the study:
- SOURCE OF TEST MATERIAL
- Source and lot/batch No.of test material: US Army armament research development and engineering center
- Expiration date of the lot/batch: not specified
- Purity: 98% - Radiolabelling:
- no
- Analytical method:
- high-performance liquid chromatography
- Details on sampling:
- - Sampling intervals for the parent/transformation products: before and after irridiation
- Sampling method: solutions of DNAN were exposed to the simulated sunlight and quantified the concentration changes using an HPLC with UV/Vis detector.
A sample was dissolved in deionized water, adjusted to pH 7 using a phosphate buffer, to achieve a 1 mg/L concentration and placed it in quartz NMR 5 mm tubes. Phototransformation was measured by using a solar simulator, SUNTEST CPS+ Xenon Test Instrument by Atlas Material Testing Technology (Chicago, IL). The Atlas Suntest CPS+ uses an air-cooled xenon lamp to simulate UV and visible solar radiation in the 300–800 nm range. Irradiance (the radiative flux, or the amount of light incident on a unit area of a surface) of 765 W/m2 was used for a period of 200–500 min with samples collected and analyzed over time.
Concentrations of DNAN in solution before and after irradiation by using an Agilent 1200 series HPLC with C18 column at 30°C, a 10 μL manual injection loop, and acetonitrile/water (60/40) mobile phase. A UV/Vis detector measured DNAN at 300 nm (using 360 nm as a reference). No analysis of phototransformation products was done during phototransformation rate studies. Dark samples of DNAN were monitored as the control. Both compounds were found to be stable in the dark over the time of the experiment.
According to ASTM 896 (ASTM International 2005), phototransformation of ionizable materials can exhibit marked pH effects that are attributable to changes in speciation. Therefore, if different species are present in the pH 5–9 range, testing should be conducted at 2–3 pH values throughout the pH 5–9 range. - Light source:
- Xenon lamp
- Light spectrum: wavelength in nm:
- >= 300 - <= 800
- Details on light source:
- See: Details on analytical Methods
- Type of sensitiser:
- natural water
- Details on sensitiser:
- U.S. EPA method OPPTS 835.5270. Humic acid in 60 ppm dissolved OC concentration served as natural organic matter.
- Concentration of sensitiser:
- ca. 60 other: ppm
- Details on test conditions:
- To determine the contribution of dissolved natural organic matter present in solution to the transformation of IM compounds under light, we used U.S. EPA method OPPTS 835.5270, “Indirect Photolysis Screening Test” (U.S. EPA 1998). Humic acid (from Sigma Aldrich, St. Louis, MO) in 60 ppm dissolved OC concentration served as natural organic matter.
We took initial phototransformation rate measurements (including those at varying pH for NTO) at 35°C because it is the lowest temperature that the solar simulator can maintain. This temperature is within the recommended standard range of test temperatures for phototransformation according to ASTM E896-92 (ASTM International 2005) but is higher than can be expected in some environments. Consequently, to describe temperature dependence of phototransformation rates, we performed direct phototransformation measurements at pH 7 for four different temperatures between 70°C and 35°C. Control solutions set in the dark indicated that both compounds were stable across the temperature range used. - Dark controls:
- yes
- Key result
- DT50:
- ca. 330 min
- Test condition:
- Direct phototransformation
- Key result
- DT50:
- ca. 5.5 h
- Test condition:
- Direct phototransformation
- Key result
- DT50:
- ca. 0.23 d
- Test condition:
- Direct phototransformation
- Transformation products:
- not measured
- Validity criteria fulfilled:
- not specified
- Conclusions:
- Phototransformation half-life of DNAN is 330 min (i.e. 5.5 h or 0.23 d)
- Executive summary:
Following ASTM Method E 896-92 guideline, Phototransformation Half-life of DNAN is 330 min, (i.e. 5.5 h or 0.23 d)
- Endpoint:
- phototransformation in water
- Type of information:
- experimental study
- Adequacy of study:
- weight of evidence
- Study period:
- June 2011
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- comparable to guideline study with acceptable restrictions
- Remarks:
- no GLP certificate
- Study type:
- direct photolysis
- Qualifier:
- equivalent or similar to guideline
- Guideline:
- OECD Guideline 316 (Phototransformation of Chemicals in Water - Direct Photolysis)
- Deviations:
- not applicable
- GLP compliance:
- not specified
- Radiolabelling:
- no
- Analytical method:
- high-performance liquid chromatography
- other: LC-MS for DNAN degradation products, attached to an HPLC system
- Details on sampling:
- - Sampling intervals for the parent/transformation products: 1 time per day
- Sampling method:
The total power of the Solar Simulator output spectrum was calibrated to the best approximation of ASTM Air Mass 1.5 Global Tilt Standard in the 280-800nm region: total irradiance of 590,000 W m-2. Experiments were conducted at 25ºC in 20 mL quartz covered crucibles (25 mm, internal diameter) with 5 mL of aqueous solutions of NQ (28 mg/ L) or DNAN (51 mg/ L) in deionized water. All tests were done in duplicate. DNAN was analyzed by reverse phase HPLC-UV. Products were analyzed as follows. Ammonium cation was analyzed by HPLC (Thermo-separation-products (TSP) model P4000 & AS3000) using a Hamilton PRP-X200 cation resin column (250 x 4.1 mm I.D., 10 μm) and a conductivity detector (Waters model 432). A mobile phase consisting of 4 mM nitric acid with 30% methanol was used at a flow rate of 0.5 mL/ min and 40°C. Detection limit of the method is 0.050 mg/ L. Formaldehyde was analyzed by HPLC after derivatization with 2,4-pentanedione. Detection limit of the method is 0.025 mg/ L.
Glycolate, acetate, formate, and glyoxylate were quantified by HPLC (Waters) equipped with a pump model 600, an autosampler model 717 plus, and a conductivity detector (model 432).The separation was made on a DIONEX IonPac AS15 column (4 x 250 mm). A mobile phase of 5 mM KOH was first run for 20 min then a gradient up to 40 mM KOH was used for 30 min which was maintained for additional 5 min at a flow rate of 1.5 mL/ min and 40°C. The detection of anions was enhanced by reducing the background with an autosuppressor from ALTECH (model DS-Plus) which allowed detection limits for each anion of 0.15 mg/ L. Other anions (NO2-, NO3-) were monitored using an HPLC from Dionex (system DX-500) equipped with a conductivity detector and Dionex ion chromatography column (IonPac AS15) (250 mm x 4 mm ID). The mobile phase is 30 mM KOH solution. Analysis was carried out at room temperature under a flow rate of 1.5 mL/ min.
DNAN degradation products were analyzed by LC-MS using a mass spectrometer (MS, Bruker MicroTOFQ mass analyzer) attached to an HPLC system (Hewlett Packard 1200 Series) equipped with a DAD detector. Aliquots (10 μL) were injected into a 3.5 micron-pore size Zorbax SB-C18 column (2.1 mm ID × 150 mm; Agilent, Mississauga, Canada) at 25°C. The solvent system was composed of a CH3OH/H2O gradient (40 to 90% v/v) at a flow rate of 0.15 mL/ min. For mass analysis, negative electrospray ionization (ES-) was used to produce deprotonated molecules (M-H)¯ and characteristic mass fragments. Mass range was scanned from 40 to 1000 m/z. Degradation products, mass balances, and stoichiometries were determined to elucidate degradation pathways to better understand the fate of these compounds when exposed to solar irradiation.
- Sampling intervals/times for pH measurements: not specified
- Sampling intervals/times for sterility check: not specified
- Sample storage conditions before analysis: not specified
- Other observation, if any (e.g.: precipitation, color change etc.): not specified - Light source:
- sunlight
- Light spectrum: wavelength in nm:
- >= 280 - <= 800
- Relative light intensity:
- 590 000
- Details on light source:
- In order to predict the degradability of those chemicals in naturally occurring conditions, the irradiation experiments were conducted using artificial sunlight generated from a SolSim Solar Simulating Photoreactor (Luzchem Research, Inc, Canada). The total power of the Solar Simulator output spectrum was calibrated to the best approximation of ASTM Air Mass 1.5 Global Tilt Standard in the 280-800nm region: total irradiance of 590,000 W m-2.
- Details on test conditions:
- TEST SYSTEM
- Type, material and volume of test apparatus/vessels: 20 mL quartz covered crucibles
- If no traps were used, type of test system: closed
TEST MEDIUM
- Kind and purity of water: deionized water
REPLICATION
- No. of replicates (dark): 2
- No. of replicates (irradiated): 2
- Duration:
- 25 d
- Temp.:
- 25 °C
- Initial conc. measured:
- 51 mg/L
- Reference substance:
- not specified
- Dark controls:
- not specified
- Key result
- % Degr.:
- 50
- Sampling time:
- 3.1 d
- Test condition:
- disappeareance with SolSim
- Quantum yield (for direct photolysis):
- 0.22
- Predicted environmental photolytic half-life:
- 3.1 d
- Transformation products:
- yes
- Remarks:
- C7H7NO4, C6H4N2O5, C6H6N2O3, C6H4N2O4, C7H6N2O4, C7H4N2O4, C7H4N2O5, C7H4N2O5.
- No.:
- #1
- No.:
- #2
- No.:
- #3
- No.:
- #4
- No.:
- #6
- No.:
- #5
- Validity criteria fulfilled:
- yes
- Conclusions:
- Photodegradation of DNAN and the formation of its degradation products with time. Similar to NTO, plot of ln {C[DNAN] /C0 [DNAN]} vs. time gave straight line with r2 =0.99 confirming that photolysis of DNAN (51 mg/ L) proceeded was a first order reaction. The rate constant kDNAN SS and t1/2 of DNAN disappearance with SolSim were 0.22 d-1 and 3.1 d, respectively.
- Executive summary:
The report summarizes findings on the environmental fate and ecological impact of DNAN. Firstly, aqueous solubility (Sw), octanol/water partition coefficients (Kow), sorption and stability were measured in two soils (DRDC-08 and DRDC-09 as provided by DRDC). Secondly the toxicity of the chemical on various ecological receptors including earthworms, alga, and bacteria were determined. Preliminary findings showed that DNAN has a higher sorption coefficient indicating that this chemical will stay close to the soil surface.
However DNAN was found to photodegrade at wavelengths within the range of solar irradiation. Also indigenous bacteria in soil were found capable of degrading DNAN. These preliminary experimental findings indicate that DNAN may not stay in the open environment indefinitely but rather they can photodegrade (soil surface) and biodegrade.
Referenceopen allclose all
Description of key information
For this endpoint 2 different independent sources of data were provided. Every information provided is relevant for this endpoint, even if the information from each single source alone could be judged insufficient, as these studies did not followed strictly established guidelines, under GLP conditions.
Despite, a strong consistency in the results presented in both studies used for this endpoint was noticed, leading to conclude that combined weight is substantial for allowing an expert judgement.
In fact, every study presented for this endpoint, did not follow strictly established guidelines, but these studies all concluded on the same key value: Half-life of the susbtance in water (i.e. 2,4 -dinitroanisole) is 0.22 d.
Key value for chemical safety assessment
- Half-life in water:
- 0.22 d
Additional information
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