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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Phototransformation in water

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Administrative data

phototransformation in water
Type of information:
Adequacy of study:
weight of evidence
4 (not assignable)
Rationale for reliability incl. deficiencies:
other: The reference given is a risk assessment report on hydrogen peroxide considering the available experimental and other data on the substance. Only short summary of original studies/publications are reported.

Data source

Reference Type:
European Union Risk Assessment Report, CAS-No. 7722-84-1, Hydrogen peroxide
European Commission
Bibliographic source:
Institute for Health and Consumer Protection, European Chemicals Bureau, Existing Chemicals, Second Priority List, Vol. 38

Materials and methods

Results and discussion

Applicant's summary and conclusion

Executive summary:

The following text is copied from the EU risk assessment carried out for hydrogen peroxide:

"Direct photolysis is not expected to be an important degradation process in the aquatic environment. Hydrogen peroxide has absorption bands in the infrared, but is not decomposed by the light of these frequencies. The UV absorption spectrum is a continuous spectrum but the measured molar extinction coefficient values are low. Highest value is ∈ = 4.2 l/ (at 280 nm) decreasing continuously to 0.22 l/ (at 320 nm) and 0.00066 l/ (at 400 nm) (Schumb et al., 1955)."