Registration Dossier
Registration Dossier
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EC number: 690-796-1 | CAS number: 420-16-6
Adsorption / desorption
Administrative data
Link to relevant study record(s)
Description of key information
Key value for chemical safety assessment
Additional information
According to IUCLID Section 5.1.2 (hydrolysis), similar to all coordination complexes of boron trifluoride with organic and inorganic species (like alcohols, ethers, amines, sulfuric acid, sulfuric dioxide, etc) the complex of boron trifluoride and acetonitrile is extremely water sensitive and reacts even with moist air. In the instantaneous reaction with water as a first step acetonitrile and boron trifluoride dihydrates are formed. For this reason, the adsorption-desorption behavior of boron trifluoride acetonitrile complex was assessed in view of these two constituents.
Boron trifluoride:
When released in the atmosphere boron trifluoride (BF3) molecules in contact with atmospheric moisture form a complex: dihydrated boron trifluoride (BF3*2H2O). On the opposite if BF3 is directly brought into contact with water, it reacts violently. That is the reason why the assessment of environmental fate and pathways is based on the properties of the more stable dihydrated form of boron trifluoride.
Measurement of fluoride ion production over a range of pH values (1.2 to 9), using both ion chromatography and an ion-selective electrode, indicated a hydrolytic half-life time of less than 30 minutes for boron trifluoride. Subsequent analysis of boric acid by titration confirmed the rapidity of the reaction. Consequently, the risk associated to dehydrated boron trifluoride when released into water and so in contact with sediments can be assessed based upon the hazards of its breakdown products in water: boric acid and fluoboric acid. So, BF3 2H2O formed in moisture air transfers into soil via dry and/or wet deposition, where in turn, in high moistured soils, it could hydrolyse in pore water. In addition, the sorption potential of boron on soils was widely described and assessed as low (European Risk Assessment of Boric acid, 2007).
Acetonitrile:
No experimental data addressing the adsorption/desorption properties of acetonitrile are available.
According to Annex VIII of REACh, the study does not need to be conducted if based on the physicochemical properties the substance can be expected to have a low potential for adsorption (e.g. the substance has a low octanol water partition coefficient).
The log Pow of acetonitrile was determined to be -0.34 (see IUCLID section 4.7.).
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