Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

The available environmental fate studies (hydrolysis, ready biodegradability and adsorption/desorption tests) were performed with FAT 41'030/A, a structural analogue of FAT 41045. Both substances are very similar in their chemical structure and, as demonstrated, in a number of physicochemical properties. Therefore, the use of these studies with FAT 41030 for read-across is considered to be appropriate. Simulation tests are not required at this tonnage band.

 

Hydrolysis determination at different pH values was based on OECD Guideline 111, "Hydrolysis as a Function of pH"; adopted May 12, 1981 and on EEC Directive 92169, Section C.7, "Abiotic Degradation: Hydrolysis as a Function of pH", L383 A, December 1992. The solubility of FAT 41'030/A in the buffer solutions pH 4.0, pH 7.0 and pH 9.0 was very low. It was not possible to increase the solubility of the test item with the use of THF as solubilizer. The test item could not be detected in any of the sample solutions. Therefore, no further testing could be performed with FAT 41'030/A at pH 4.0, pH 7.0 and pH 9.0 as the test item shows no significant solubility in the different solvent systems.

Two biodegradability tests were available. One ready biodegradability test was performed under aerobic static exposure conditions using the Manometric Respirometry Test and used as the key study. The result showed the biodegradation of test item after 28 days was 0 %. The other biodegradability test was carried out under the conditions prescribed in the Chemical Substances Control law and used as a supportive study. As a result, the percentage degradation values of the triplicate "test material degradation" systems based on biological oxygen demand were all 1 % (mean: 1 %). And the percentage degradation of test material was 0 % as mean of the triplicate system based on HPLC analysis. Thus, the test material, FAT 41'030/A, is not biodegradable based on the two biodegradability tests.

The chemical oxygen demand was determined being 1675 mg O2/g test material.

The determination of the adsorption coefficient (Koc) was performed according to the OECD Guideline for the Testing of Chemicals, No. 121, Estimation of the Adsorption Coefficient (Koc) on Soil and Sewage Sludge using High Performance Liquid Chromatography (HPLC), January, 2001. The result showed the log Koc of FAT 41'030/A was 6.3 (first peak), 6.6 (second peak) and 7.0 (third peak). The Koc was calculated to be 1995262 (first peak), 3981072 (second peak) and 10000000 (third peak). Thus, FAT 41'030/A is immobile.

In conclusion both, the test substance, FAT 41030, and its structural analogue, FAT 41045, are not biodegradable and are immobile in the environment, adsorbing efficiently to organic matter. Hydrolsis under environmental conditions are considered to be unlikely but could not be experimentally determined due to the low water solubility of the test item.