Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

ADONA is an emulsifier for use in production of fluoropolymers. The formulation is a ca. 30% aqueous solution, which sets a minimum water solubility level. The water acts as a solvent, and isolation of the pure salt is not practicable. Therefore, all testing was conducted of the aqueous solution rather than the pure salt. The measured vapor pressure, 1900 Pa at 20 °C, cannot be separated from the vapor pressure of pure water. However, as an ionic substance little volatility is expected for ADONA itself. Based on low expected volatility for the ionic components and high water solubility, ADONA will ultimately be present in the aquatic compartment.

During drying processes the ammonium salt ADONA is released with the off-gas as ammonia and the acid DONA. If present in the atmosphere, the high water solubility of both DONA and ADONA indicates removal with atmospheric precipitation. Long-distance transportation is not expected. ADONA will dissociate in soils and surface waters to form ammonium ion, which is subject to nitrogen cycling in the environment, and DONA anion. DONA anion is very persistent based on 6% CO2/ThCO2 in a 28-day OECD 301B assay. The 301B test measures CO2 evolution and provides information on DONA anion biodegradation only.

Ammonium is a normal metabolic product subject to homeostatic regulation and is not expected to be bioaccumulative. DONA anion is not bioaccumulative based on a measured 34-day BCF for ADONA of 0.094 in carp (OECD 305). In this test, only the DONA anion was quantified.

ADONA Koc was measured in an HPLC study (OECD 121). As with the BCF study, only the DONA anion was examined. A Koc < 20 L/kg was measured for DONA anion by HPLC. The anion is not expected to bind to soils and sediments and is readily transported within the soil profile. As a cation, ammonium is capable of associating with negatively charged clay surfaces. Some sorption may occur, but the major fate of ammonium is nitrification, with denitrification occurring under appropriate conditions.

Summary: ADONA is an ionic substance that will be present in dissociated form in the aqueous compartment. It will be subject to little or no biodegradation, but will not bioaccumulate.