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Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

Biodegradation

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 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, EZPTF 7011-213).   

 

Table 5.2.1Ready Biodegradability of NaPT, and the primary non-transient degradation product 2-Pyridine sulphonic acid (PSA)

Guideline /
Test method

Test type1

Test parameter

Inoculum

Additional substr.

Test substance concentr.

Degradation

Reference

Type

Concen­tration

Adap­tation

Incubation period

Degree
[%]

OECD guideline 301B

ready

CO2evolution

Activated sludge

30 mg dry material per litre

No

No

NaPT

30.2 mg/L

(5 mg carbon/L)

28 d

0 % degradation after 6 days, 24 % degradation after 20 days

79 % degradation after 28 days

5.2.1.002

EZPTF 7011-214

Clarke (2002)

92/69/EEC, C.4-C.
OECD 301B.

ready

CO2evolution

Activated sludge

30 mg dry material per litre

No

No

NaPT

10 mg/L

43 d

2 % degradation after 8 days, 60 % degradation after 18 days, 70% degradation after 43 days.

5.2.1.001

EZPTF 7011-211

Jenkins (1998)

OECD guideline 301B

ready

CO2evolution

Activated sludge

30 mg dry material per litre

No

No

PSA

26.5 mg/L

(10 mg carbon/L)

29 d

49 % degradation after 6 days, 64 % degradation after 14 days

73 % degradation after 28 days

5.2.1.003

EZPTF 7011-213

Clarke (2002)

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 1907/2006.