Registration Dossier
Registration Dossier
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EC number: 939-053-8 | CAS number: -
Endpoint summary
Administrative data
Description of key information
Additional information
The multiconstituent substance is a reaction mass of inorganic an organic acids. The substance itself constains considerable amounts of water (46.2%) that cannot be removed without changing the identity of the substance itself. The constituent sulfuric acid has a strong affinity to water. Therefore it is very difficult to concentrate sulfuric acid. The system water/sulfuric acid is an azeotrope. If heating of the substance is enhanced to remove more water, it is to be expected that H2SO4 will be lost from the substance. Therefore it is not possible to reduce the water content to 20% without changing the composition. Furthermore we cannot exclude any decomposition reactions of the benzene sulfonic acids by high heat.
The substance is imported as aqueous solution. Since the substance is used in all cases as aqueous solution as imported, it was decided to use the aqueous solution for the tests necessary für the information requirements according to the tonnage band 1 - 10 t/a standard requirements (REACH Regulation) for the endpoint "Biodegradation: Annex VII; 9.2.1.1".
The first reason for this procedure is that the substance is only used as aqueous solution, so that the situation of the use of the substance is more realistic for the environment. The second reason is that it makes no sense to concentrate the aqueous solution of the substance prior the above mentioned tests in order to dissolve it again in water to perform the tests.
The ready biodegradation of the test substance was investigated in a study conducted according to OECD Guidelines for Testing of Chemicals No. 301A, “Ready Biodegradability; die away Test”, referenced as method C.4-A of Commission Directive 92/69/EEC, using predominantly domestic activated sludge microorganisms as inoculum. The biodegradation rate was determined by measurement of DOC consumption. This study is regarded as reliable without restriction and satisfies the guideline requirements for ready biodegradation. The test material attained <1% degradation after 28 days and proved not to be readily biodegradable under the stringent test conditions.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
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