Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

 Stability

 

Phototransformation in air

 

If released to air, a vapor pressure of 0.68 mm Hg at 25 deg C (0.68 mm Hg is equivalent to vapour pressure of 90.7 Pa ) indicates that O-isopropyl ethylthiocarbamate (IPETC ) will exist solely as a vapor in the atmosphere. Vapor-phase O-isopropyl ethylthiocarbamate 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 0.234 days, calculated from its rate constant of 45.7698 E-12 cm3/molecule-sec at 25 deg.

O-isopropyl ethylthiocarbamate (IPETC) do not contain chromophores that absorb at wavelengths >290 nm and therefore O-isopropyl ethylthiocarbamate (IPETC ) is not expected to be susceptible to direct photolysis by sunlight.

Using the AOPWIN QSAR model, the photochemical degradation rate of O-isopropyl ethylthiocarbamate in the atmosphere is 45.7698 E-12cm3/molecule-sec, with a resultant predicted half live of 2.804 Hrs ( 0.234 Days (12-hr day; 1.5E6 OH/cm3))

 

OVERALL OH Rate Constant = 45.7698 E-12 cm3/molecule-sec

HALF-LIFE = 0.234 Days (12-hr day; 1.5E6 OH/cm3)

HALF-LIFE = 2.804 Hrs

 

Phototransformation in water

It is not applicable for a compound wich is slightly soluble or moderately soluble

Phototransformation in soil

If released to soil, Isopropyl Ethyl Thionocarbamate (IPETC) is expected to have high mobility based upon an estimated Koc of 79.22 . Volatilization from moist soil surfaces is not expected to be an important fate process.

Therefore testing for Phototransformation in soils does not need to be performed.

 

Hydrolysis

 

Hydrolysis is a chemical reaction during which molecules of water (H2O) are split into hydrogen cations (H+, conventionally referred to as protons) and hydroxide anions (OH−) in the process of a chemical mechanism).

The hydrolysis of the substance was less than 10% over the 5 days, so a definitive test was not performed. Based on these results, Reaction mass of O-isopropyl ethylthiocarbamate (98%) and n-butanol (1%) and propan-2-ol (1%) (IPETC) was hydrolytically stable (half life > 1 year) specified by the OECD Guidelines .