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Environmental fate & pathways

Hydrolysis

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Description of key information

Key value for chemical safety assessment

Half-life for hydrolysis:
108 d
at the temperature of:
25 °C

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.

In two guideline studies ZnPT was found to be relatively hydrolytically stable (Table 5.1.2).

Table  5.1.2 Hydrolysis

Guideline /
Test method

pH

Temperature
[°C]

Initial TS concentration, C0
[mg/L]

Reaction rate constant, Kh

Half-life, DT50

Coefficient of correlation, r2

Reference

EPA 161-1 (similar to OECD 111)

pH 5, 7 and 9 (fw)

pH 8.2 (sw)

25 ± 1°C(pH 5, 7 and 9 fw)

25 ± 1°C(pH 8.2 sw)

2.0 mg/L

0.00703 d-1at 25°C (pH 5 fw)

0.00576 d-1at 25°C (pH 7 fw)

0.00562 d-1at 25°C (pH 9 fw)

0.00721 d-1at 25°C (pH 8.2 sw)

DT50values at:

pH 5: 98 days (25°C)

pH 7: 120 days (25°C)

pH 9: 123 days (25°C)

pH 8.2 (sw): 96 days (25°C)

 

0.9994

0.9804

0.9291

0.9248

Reynlods (1995)

Federal Register Vol. 50, No. 188 (Friday 27 1985) Rules and Regulations, p. 39252.

pH 3, 7 and 11

25 ± 1°C

5 mg/L

4.6 x 10-4h-1at pH 3,

0 at pH 7

7.1 x 10-4h-1at pH 11,

 

DT50values at:

pH 3: 63 days

pH 7: >1 year

pH 11: 41 days

 

0.76

n.a.

0.97

Stanley, Croudace, Magor (1996)

EPA 161-1 (similar to OECD 111)

pH 5, 7 and 9 (fw)

pH 8.2 (sw)

25 ± 1°C(pH 5, 7 and 9 fw)

25 ± 1°C(pH 8.2 sw)

0.05 mg/L
(copper pyrithione)

0.00301 d-1at 25°C (pH 5 fw)

0.00639 d-1at 25°C (pH 7 fw)

0.0939 d-1at 25°C (pH 9 fw)

0.0536 d-1at 25°C (pH 8.2 sw)

DT50values at:

pH 5: 230 days (25°C)

pH 7: 108 days (25°C)

pH 9: 7.4 days (25°C)

pH 8.2 (sw): 12.9 days (25°C)

 

0.9257

0.9895

0.9982

0.9991

Key Study

Fenn (1999)