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Environmental fate & pathways

Hydrolysis

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Description of key information

The test item Active Substance of Granofin Easy F-90 liq in Aqueous Solution showed a faster transformation at higher pH values at the environmental typical temperature of 20 °C for pH 4 and 7 and 20.5 °C for pH 9 (due to technical reasons).

Key value for chemical safety assessment

Half-life for hydrolysis:
5 d
at the temperature of:
20 °C

Additional information

Hydrolysis as a function of pH was determined according to OECD Guideline No. 111 and Council Regulation (EC) No. 440/2008, Method C.7 for the test item Active Substance of Granofin Easy F-90 liq in Aqueous Solution from 2012-08-03 to 2012-10-18 atDr.U.Noack-Laboratorien, 31157 Sarstedt, Germany.

Analyses of the test item were performed viaUV detection (HPLC-DAD)on a reversed phase column using an external standard. The method was

validated with satisfactory results in regard to linearity, accuracy, precision and specificity.

For pH 4, 7 and 9 a 5 day (preliminary) testing at 50 °C was performed. During this testing hydrolysis (more than 10 % reduction of the test item) was observed and therefore for all pH conditions the definitive testing was performed. The definitive testing was conducted with a test item concentration of 10 mg/L in buffer solutions of pH 4, 7 and 9 at a temperature of 20 °C. At pH 9 the definitive test was conducted at a temperature of 20.5 °C due to technical reasons. For pH 4, 7 and 9 samples were taken at test start (0 h) and at a minimum of 8 spaced points until end. Buffer solutions were analysed at test start and test end and there was no analytical interference with the test item. The test itemActive Substance of Granofin Easy F-90 liq in Aqueous Solutionshowed a faster transformation at higher pH values at the environmental typical temperature of 20 °C for pH 4 and 7 and 20.5 °C for pH 9 (due to technical reasons).

Reaction Rate Constants and Half Lives of ActiveSubstance of Granofin Easy F-90 liq in Aqueous Solutionat 20 °C

pH 4

pH 7

pH 9

Reaction rate constantkobs
[1/s]

7.42 x 10-7

1.61 x 10-6

8.75 x 10-5

Half lifeT½[h]

259

120

2.20

Half lifeT½[d]

11

5.0

n.a.

n.a. = not applicable