CAS RN:107-15-3

Exposure Summary

Ethylenediamine is produced in large quantities and large amounts of the chemical may be released, as emissions and in wastewater during its production and use as a chemical intermediate. Despite its wide use, no monitoring data or information concerning concentrations in effluents could be located. If released to air, a vapor pressure of 12.1 mm Hg at 25 deg C indicates ethylenediamine will exist solely as a vapor in the ambient atmosphere. Vapor-phase ethylenediamine 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 6 hours. In the atmosphere, ethylenediamine should react with photochemically-produced hydroxyl radicals and carbon dioxide to form the insoluble carbonate. It will also be scavenged by rain. If released to soil, ethylenediamine is expected to have slight mobility based upon an average Koc of 4766. Volatilization from moist soil surfaces is not expected to be an important fate process based upon a Henry's Law constant of 1.73X10-9 atm-cu m/mole. Ethylenediamine may volatilize from dry soil surfaces based upon its vapor pressure. However, adsorption to soil may attenuate volatilization. If released into water, ethylenediamine is expected to adsorb to suspended solids and sediment in water based upon the average Koc value. Based on aerobic screening studies, biodegradation is expected to be the most important degradation process for this compound in the environment but no experimental rates in water or soil are available. Biodegradation of ethylenediamine using sewage inocula ranged from 47 to 95% loss of the theoretical BOD over 2 to 3 weeks. Volatilization from water surfaces is not expected to be an important fate process based upon this compound's Henry's Law constant. As ethylenediamine has two primary amine groups, at the pH range found in most environmental waters, it is expected to be partially protonated; the dissociated form will not volatilize. An estimated BCF of <1 suggests the potential for bioconcentration in aquatic organisms is low. Human exposure to ethylenediamine is primarily occupational via dermal contact and inhalation with the vapor and aerosol at workplaces where ethylenediamine is produced or used. (SRC)
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