Registration Dossier
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EC number: 236-671-3 | CAS number: 13463-41-7
Phototransformation in water
Administrative data
Link to relevant study record(s)
Description of key information
Half life values: Latitude 40 summer = 3.0minutes, latitude 40 winter = 10.6 minutes, latitude 50 summer = 3.1 minutes, latitude 50 winter = 22.2 minutes
Key value for chemical safety assessment
Additional information
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.
Three studies of the aqueous photolysis rate of zinc pyrithione have been conducted (refer to Table 5.1.3).
Table 5.1.3 Photolysis
Guideline / |
Initial molar TS concentration |
Total recovery of test substance |
Photolysis rate constant (kcp) |
Direct photolysis sunlight rate constant (kpE) |
Reaction quantum yield (fcE) |
Half-life (t1/2E) |
Reference |
US FIFRA 161-2 |
2 μg/mL (6.3 x 10-6M) |
95.9 (in pH 9 buffer) 101.0 (in asw) |
pH 9 buffer: pH 8.2 (artificial sea water): |
Not reported, not applicable to the testingguideline. |
Not reported, not applicable to the testing guideline. |
Half lives under the conditions of this study were 13.3 minutes in pH 9 buffer and 17.5 minutes in artificial seawater. |
Croudace, Gilbert, Woods (1996) |
US FDA Technical Assistance Document, Guideline 3.10 Photodegradation. 1987 |
5 μg/mL (16 x 10-6M) |
Not applicable Non-radiolabelled test substance. |
pH 5: 0.16 to 0.27min-1 pH 7: 0.38 to 0.49min-1 pH 9: 0.44 to 0.47min-1 |
Not reported, not applicable to the testing guideline. |
Not reported, not applicable to the testing guideline. |
<7 minutes for pH 5, 7 and 9 (corrected to UK Midsummer sunlight). |
Reynolds (1996) |
Methods used are similar to the requirements of OPPTS 835.2210 and OPPTS 830.7050 |
1x10-3μg/mL, (3.15x10-9M, 3.15x10-10M) |
Not applicable Non-radiolabelled test substance. |
0.483 min-1to 0.631 min.-1(depending on the weather conditions) |
0.2201 to 0.2869min-1 |
0.17 ± 0.06 |
3.0 /10.6 min (latitude 40 summer/ winter) 3.1 /22.2 min (latitude 50 summer /winter) |
Key Study Fenn (2005) |
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
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