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EC number: 205-439-3 | CAS number: 140-89-6
Phototransformation in air
Administrative data
Link to relevant study record(s)
Description of key information
Using the AOPWIN QSAR model, the photochemical degradation rate of Potassium ethyl xanthate in the atmosphere is 6.1734 E-12 cm3/molecule-sec, with a resultant predicted half live of 20.791 Hrs ( 1.733 Days (12-hr day; 1.5E6 OH/cm3)
If released to air, a vapor pressure of 0.00000000263 mm Hg at 25 deg C (0.00000000263 mm Hg is equivalent to vapour pressure of 3.5E-007 Pa ) indicates that Potassium ethyl xanthate will exist solely as a vapor in the atmosphere. Vapor-phase Potassium ethyl xanthate will be degraded in the atmosphere by reaction with photochemically-produced hydroxyl radicals; the half-life for this reaction in air is estimated to be 1.733 days, calculated from its rate constant of 6.1734 E-12 cm3/molecule-sec at 25 deg.
Xanthates do not contain chromophores that absorb at wavelengths >290 nm and therefore Potassium ethyl xanthate is not expected to be susceptible to direct photolysis by sunlight.
Key value for chemical safety assessment
- Half-life in air:
- 1.733 d
- Degradation rate constant with OH radicals:
- 0 cm³ molecule-1 s-1
Additional information
Using the AOPWIN QSAR model, the photochemical degradation rate of Potassium ethyl xanthate in the atmosphere is 6.1734 E-12 cm3/molecule-sec, with a resultant predicted half live of 20.791 Hrs ( 1.733 Days (12-hr day; 1.5E6 OH/cm3)
OVERALL OH Rate Constant = 6.1734 E-12 cm3/molecule-sec
HALF-LIFE = 1.733 Days (12-hr day; 1.5E6 OH/cm3)
HALF-LIFE = 20.791 Hrs
If released to air, a vapor pressure of 0.00000000263 mm Hg at 25 deg C (0.00000000263 mm Hg is equivalent to vapour pressure of 3.5E-007 Pa ) indicates that Potassium ethyl xanthate will exist solely as a vapor in the atmosphere. Vapor-phase Potassium ethyl xanthate will be degraded in the atmosphere by reaction with photochemically-produced hydroxyl radicals; the half-life for this reaction in air is estimated to be 1.733 days, calculated from its rate constant of 6.1734 E-12 cm3/molecule-sec at 25 deg.
Xanthates do not contain chromophores that absorb at wavelengths >290 nm and therefore Potassium ethyl xanthate is not expected to be susceptible to direct photolysis by sunlight.
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