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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Environmental fate & pathways

Hydrolysis

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Administrative data

Link to relevant study record(s)

Description of key information

A preliminary test (Tier 1) was performed for the determination of the rate of hydrolysis of di C8-C10, branched, C9 rich, alkylnaphthalene sulphonic acid (DNNSA) at pH values normally found in the environment (pH 4-9). At each pH value a degree of hydrolysis of < 10% was observed after 5 days. According to the guideline, performance of the main study (Tier 2) was not required.

The half-life time of the test substance at 25°C is > 1 year at the pHs tested.

Key value for chemical safety assessment

Half-life for hydrolysis:
1 yr
at the temperature of:
25 °C

Additional information

The half-life time of the test substance at 25°C was:

t½ pH 4: > 1 year

t½ p H 7 > 1 year

t½ pH 9 > 1 year