Registration Dossier
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EC number: 918-205-7 | CAS number: -
Biodegradation in water: screening tests
Administrative data
Link to relevant study record(s)
Description of key information
n-Butyltriphenylphosphonium bromide is not readily biodegradable under the conditions of the CO2 Evolution Test (modified Sturm test, OECD 301B, GLP, read-across from structural analogue).
Key value for chemical safety assessment
- Biodegradation in water:
- under test conditions no biodegradation observed
Additional information
The read-across hypothesis is based on the assumption that biodegradability of source and target is similar. Source and target are both n-Butyltriphenylphosphonium salts with an identical organic moiety, the n-Butyltriphenylphosphonium ion. Source and target deviate only in their counterions - the source substance has chloride as counterion, the target substance bromide. However, source substance as well as target substance are soluble in water. When dissolved, the organic moiety and the counterions act individually. The counterions chloride and bromide are inorganic. Inorganic substances do not degrade biotically. Biodegradability testing of inorganic substances is not required in accordance with REACH Regulation Annex VII, 9.2.1.1., column 2. Thus, biodegradability is determined by the organic moiety only. As source and target do have an identical organic moiety, this read-across is justified.
The biodegradation of n-Butyltriphenylphosphonium chloride was investigated over a 29-day period in a CO2 Evolution Test (modified Sturm test) according to OECD guideline 301 B (1992).
n-Butyltriphenylphosphonium chloride is not readily biodegradable in this test.
n-Butyltriphenylphosphonium chloride is not inhibitory to microorganisms at a concentration of 16 mg/L.
By read-across, n-Butyltriphenylphosphonium bromide is considered to be not readily biodegradable.
By read-across, n-Butyltriphenylphosphonium bromide is considered to be not inhibitory to microorganisms.
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