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EC number: 223-296-5
CAS number: 3811-73-2
Sodium pyrithione, which is
completely ionized in water, was shown to be readily biodegradable under
the conditions of OECD 301B (seeTable 5.2.1) in two separate
The major non transient
metabolite, pyridine sulphonic acid, was also shown to be readily
biodegradable under the conditions of OECD 301B (5.2.1.003, EZPTF
Biodegradability of NaPT, and the primary non-transient degradation
product 2-Pyridine sulphonic acid (PSA)
Guideline /Test method
Test substance concentr.
OECD guideline 301B
30 mg dry material per litre
(5 mg carbon/L)
0 % degradation after 6 days, 24 % degradation after 20 days
79 % degradation after 28 days
92/69/EEC, C.4-C.OECD 301B.
2 % degradation after 8 days, 60 % degradation after 18 days, 70% degradation after 43 days.
(10 mg carbon/L)
49 % degradation after 6 days, 64 % degradation after 14 days
73 % degradation after 28 days
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