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EC number: 200-543-5 | CAS number: 62-56-6
Phototransformation in air
Administrative data
Link to relevant study record(s)
- Endpoint:
- phototransformation in air
- Type of information:
- experimental study
- Adequacy of study:
- supporting study
- Study period:
- no data
- Reliability:
- 4 (not assignable)
- Rationale for reliability incl. deficiencies:
- documentation insufficient for assessment
- Qualifier:
- according to guideline
- Guideline:
- other: no guideline reported
- Principles of method if other than guideline:
- In the test, thiourea was adsorbed on silica gel and irradiated with light (290 nm). Volatile compounds, as well as CO2, were analysed after irradiation.
- GLP compliance:
- not specified
- Light source:
- not specified
- Light spectrum: wavelength in nm:
- 290
- Key result
- % Degr.:
- 4.7
- Test condition:
- no data
- Transformation products:
- not specified
- Validity criteria fulfilled:
- not specified
- Conclusions:
- At a wavelength of 290 nm thiourea is degraded to 4.7 % (test duration not reported).
- Executive summary:
In the test, thiourea was adsorbed on silica gel and irradiated with light (290 nm). Volatile compounds, as well as CO2, were analysed after irradiation.
At a wavelength of 290 nm thiourea is degraded to 4.7 % (test duration not reported).
- Endpoint:
- phototransformation in air
- Type of information:
- calculation (if not (Q)SAR)
- Adequacy of study:
- supporting study
- Study period:
- no data
- Reliability:
- 4 (not assignable)
- Rationale for reliability incl. deficiencies:
- secondary literature
- Qualifier:
- no guideline available
- Principles of method if other than guideline:
- Computer estimation of the Atmospheric gas-phase reaction rate of organic compounds with hydroxyl radicals and ozone.
- GLP compliance:
- not specified
- Light source:
- not specified
- Validity criteria fulfilled:
- not applicable
- Conclusions:
- The rate constant for the vapour-phase reaction of thiourea with photochemically-produced hydroxyl radicals has been estimated as 4.2X10-11 cu cm/molecule-sec at 25 °C using a structure estimation method, corresponding to an atmospheric half-life t1/2 of about 3 h at an atmospheric concentration of 5X10+5 hydroxyl radicals per cu cm.
- Executive summary:
Meylan & Howard conducted a computer estimation of the atmospheric gas-phase reaction rate of organic compounds with hydroxyl radicals and ozone.
The rate constant for the vapour-phase reaction of thiourea with photochemically-produced hydroxyl radicals has been estimated as 4.2X10-11 cu cm/molecule-sec at 25 °C using a structure estimation method, corresponding to an atmospheric half-life t1/2 of about 3 h at an atmospheric concentration of 5X10+5 hydroxyl radicals per cu cm.
- Endpoint:
- phototransformation in air
- Type of information:
- experimental study
- Adequacy of study:
- supporting study
- Study period:
- no data
- Reliability:
- 4 (not assignable)
- Rationale for reliability incl. deficiencies:
- secondary literature
- Qualifier:
- according to guideline
- Guideline:
- other: GSF Test on photodegradation
- GLP compliance:
- not specified
- Light source:
- not specified
- Transformation products:
- not specified
- Validity criteria fulfilled:
- not specified
- Conclusions:
- Thiourea is photochemically degraded to 0.23 % (test duration not reported).
- Executive summary:
Under the conditions of the GSF test, Schmidt-Bleek et al. (1982) report that thiourea is photochemically degraded to 0.23 % (test duration not reported).
Referenceopen allclose all
Description of key information
An atmospheric half-life t1/2 of about 3 hours at an atmospheric concentration of 5X10+5 hydroxyl radicals per cu cm is reported for thiourea.
Key value for chemical safety assessment
- Half-life in air:
- 3 h
Additional information
Available literature on phototransformation of thiourea in air reports that the substance is degraded from 0.23% to 4.7% under the conditions of the GSF test (Schmidt-Bleek et al., 1982) and when irridiated at a wavelength of 290 nm (Freitag et al., 1985), respectively. The total test duration for these two experiments is however unknown.
In addition, Meylan & Howard (1993; as cited in the Hazardous Substances Data Bank) determined an atmospheric half-life t1/2 of about 3 hours at an atmospheric concentration of 5X10+5 hydroxyl radicals per cu cm.
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