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EC number: 223-296-5
CAS number: 3811-73-2
pyrithione, which is completely ionized in water, was shown to be
readily biodegradable under the conditions of OECD 301B (see Table
5.2.1) in two separate studies.
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,
Table 5.2.1 Ready
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
The information contained within this robust summary document comes from
studies which are in the ownership of Arch Chemicals Inc. and which are
protected in several regions globally. This information may not be used
for any purpose other than in support of the Chemical safety Report
submitted by Arch Chemicals Inc. under RegulationEC
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