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EC number: 220-239-6 | CAS number: 2682-20-4
- 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:
- key study
- Study period:
- 14 May 1990 - 27 February 1992
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- other: GLP/Guideline study
- Study type:
- direct photolysis
- Qualifier:
- according to guideline
- Guideline:
- EPA Guideline Subdivision N 161-2 (Photodegradation Studies in Water)
- Deviations:
- not specified
- GLP compliance:
- yes
- Specific details on test material used for the study:
- Details on properties of test surrogate or analogue material (migrated information):
Not applicable. - Radiolabelling:
- yes
- Analytical method:
- other: HPLC and radioassay
- Details on sampling:
- Samples were taken for analysis by radioassay and by HPLC at Days 0, 4, 10, 16, 24, and 30.
- Buffers:
- pH 7 buffer solution prepared by adding 22.4 ml of KH2PO4 (0.1M) to 25.8 ml of Na2HPO4 (0.1M) then adding water to a final volume of one liter.
The solution was sterilized by filtering through a 0.22 micron filter. The pH was rechecked using an Orion 501 pH Meter. - Light source:
- sunlight
- Details on light source:
- Natural sunlight
- Details on test conditions:
- 14C RH-573 was exposed to natural sunlight at 10.8 ppm in sterile pH 7 aqueous buffer solution for up to 30 days, concurrent with an identical dark control system. Light exposed samples were contained in quartz tubes and dark controls were contained in Pyrex tubes wrapped with foil to prevent irradiation. Both samples were placed in a temperature controlled water bath at 24.9±0.8 °C.
- Duration:
- 30 d
- Temp.:
- 25 °C
- Initial conc. measured:
- 10 mg/L
- Reference substance:
- not specified
- Dark controls:
- yes
- Remarks:
- Dark controls were contained in Pyrex tubes wrapped with foil to prevent irradiation
- Computational methods:
- Average (arithmetic mean), standard deviation, standard error and linear regression were the only statistical methods employed in the analysis of data.
- Predicted environmental photolytic half-life:
- The pseudo first-order calculated half-life of degradation was 266 hours (11 days) (R(2) = 0.86) for light exposed samples and 10191 hours (425 days) (R(2) = 0.11) for dark control samples. The low coefficient of correlation observed in the control samples reflects the minimal degradation which occurred in the dark during the sample period.
- Transformation products:
- yes
- No.:
- #1
- No.:
- #2
- Details on results:
- The recovery of applied radioactivity is 96.0±4.4% for the light exposed samples and 99.0±5.3% for the dark control samples. At the termination of the experiment (Day 30), parent comprised approximately 18% and 96% of the applied radiocarbon in the light exposed and dark controls, respectively. Half-life was calculated as 11 days for the light exposed samples and 425 days for the dark control samples. 14C CO2 accounted for 2.7% of the total applied activity and its presence demonstrated that the isothiazolone ring was cleaved. Two major photodegradates were detected in the light exposed samples. One, less polar than the parent accounted for 39.5% of the applied radiocarbon and was identified as 3-methyl-4-thiazolin-2-one, by mass spectroscopy and NMR. The other, accounted for 37.5%, was identified as N-methyl malonamic acid chromatographically.
- Results with reference substance:
- No data.
- Validity criteria fulfilled:
- yes
- Conclusions:
- Half-life was calculated as 11 days for the light exposed samples and 425 days for the dark control samples.
- Executive summary:
The photodegradation capability of test material was determined in water. Half-life was calculated as 11 days for the light exposed samples and 425 days for the dark control samples.
Reference
Radiochemical Purity of [14C]RH-573 used in this study was determined by HPLC to be 96.8%. Stability of the test substance under the conditions of administration was demonstrated by the HPLC analysis of the zero time samples which showed no degradation of RH-573.
Solution Stability (Sorption Test)
The average radiocarbon in solution at 10.3 ppm was 97.9 + 2.5% for the quartz sample holders. Similar results were obtained in pyrex containers in a hydrolysis study on RH-573. This [14C]RH-573 does not irreversibly adsorb to the glass sample tubes.
Material Balance of [14C]RH-573 throughout the Study Period
The material balance of [14C]RH-573 was determined by summing the radiocarbon remaining in solution and radiocarbon volatilized, and is expressed as percentages of radiocarbon applied (Table 2). Radiocarbon recoveries averaged 97.5 + 5.0% based on nominal applied radioactivity. No radiocarbon was detected in ethylene glycol traps at levels greater than 0.5%. The KOH traps contained 2.7% of the applied radiocarbon in light exposed samples which was confirmed as 14CO2 by precipitation as barium carbonate.
Table 2 Product Balance of [14C]RH-573 and its Degradates Expressed as Percent of Applied Radiocarbon
Sample/Replicate | % RH-573 | Degradate 11 | Degradate 22 | CO2 | Unkown* | Total Recovery |
Hour 0 | ||||||
Irradiated (1) | 100.9 | - | - | - | - | 100.9 |
Irradiated (2) | 100.8 | 0.1 | - | - | - | 100.9 |
Dark Control (1) | 100.8 | - | - | - | - | 100.8 |
Dark Control (2) | 100.8 | - | - | - | - | 100.8 |
Day 4 (Hour 98.3) | ||||||
Irradiated (1) | 95.5 | - | - | 0.2 | - | 95.5 |
Irradiated (2) | 100.2 | - | - | 0.2 | - | 100.2 |
Dark Control (1) | 107.2 | - | - | - | - | 107.2 |
Dark Control (2) | 97.8 | - | - | - | - | 97.8 |
Day 10 (Hour 242.5) | ||||||
Irradiated (1) | 50.9 | 23.5 | 18.4 | 0.6 | 0.1 | 93.5 |
Irradiated (2) | 54.3 | 24.6 | 19.0 | 0.6 | 0.1 | 98.6 |
Dark Control (1) | 92.9 | - | - | - | 0.8 [1] | 93.7 |
Dark Control (2) | 96.3 | - | - | - | - | 96.3 |
Day 16 (Hour 385) | ||||||
Irradiated (1) | 20.6 | 35.6 | 35.8 | 2.2 | 0.2 | 94.4 |
Irradiated (2) | 22.0 | 33.0 | 33.2 | 2.2 | 0.2 | 90.6 |
Dark Control (1) | 109.2 | - | - | 0.1 | - | 109.3 |
Dark Control (2) | 94.4 | - | - | 0.1 | - | 94.5 |
Day 24 (Hour 575) | ||||||
Irradiated (1) | 48.4 | 7.4 | 30.1 | 2.3 | 0.2 | 88.4 |
Irradiated (2) | 26.8 | 24.7 | 36.8 | 2.3 | 0.2 | 90.8 |
Dark Control (1) | 102.0 | - | - | 0.1 | 0.2 [1] | 102.3 |
Dark Control (2) | 92.7 | - | - | 0.1 | - | 92.8 |
Day 30 (Hour 721) | ||||||
Irradiated (1) | 19.0 | 37.3 | 39.5 | 2.7 | 0.5 | 99.0 |
Irradiated (2) | 17.5 | 37.7 | 39.6 | 2.7 | 0.5 | 98.0 |
Dark Control (1) | 94.2 | - | - | 0.1 | 0.1 | 94.3 |
Dark Control (2) | 97.0 | - | - | 0.1 | 0.1 | 97.1 |
- Indicates none detected
* The % unknowns followed by the number identified by HPLC in brackets [ ].
1) Characterized as a mixture of N-methyl malonamic acid, N-methyl acetamide and N-methyl oxamic acid.
2) 3 -methyl-4 -thiazolin-2 -one
Solution Sterility
All buffer solution samples submitted for environmental cultures showed no growth of bacteria.
Sample Analysis and Storage Stability
Samples were analyzed by HPLC and LSC immediately following their removal from the water bath. Reanalysis of selected samples after 2 months under frozen storage conditions showed no detectable change in product distribution.
Description of key information
The photodegradation capability of test material was determined in water. Half-life was calculated as 11 days for the light exposed samples and 425 days for the dark control samples
Key value for chemical safety assessment
- Half-life in water:
- 11 d
Additional information
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