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Environmental fate & pathways

Biodegradation in water: screening tests

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Reference
Endpoint:
biodegradation in water: ready biodegradability
Data waiving:
study scientifically not necessary / other information available
Justification for data waiving:
the study does not need to be conducted because the substance is inorganic
Justification for type of information:
JUSTIFICATION FOR DATA WAIVING
The substance strontium diacetate is composed of two ions : Sr2+ ion and acetate ion.

Strontiun ion is inorganic, consequently according to the § 9.2.1.1. in column 2, annex VII of REACH the study does not need to be conducted. Only the organic part (acetate) is relevant.

Acetate ion is part of a substance (sodium acetate) considered as readily biodegradable since it is used as control substance in OECD tests. This susbtance have been used in several studies in biodegradability test method development and have been identified as readily biodegradable. The report attached (MCC report 007) summaries the pratical experience on sodium acetate and is based on different references (Nyholm 1996 ; O’Malley 2006 ; Baginska 2015 ; Andreja Žgajnar Gotvajn 1996).

Consequently the substance is considered as readily biodegradable.


Ref :
Nyholm N, Ingerslev F, Berg UT, Pedersen JP, Frimer-Larsen H (1996). Estimation of kinetic rate constants for biodegradation of chemicals in activated sludge wastewater treatment plants using short term batch experiments and microgram/L range spiked concentrations. Chemosphere. 1996 Sep;33(5):851-64.

O’Malley LP (2006). Evaluation and Modification of the OECD 301F Respirometry Biodegradation Test Method with Regard to Test Substance Concentration and Inoculum. Water, Air, and Soil Pollution. November 2006, Volume 177, Issue 1, pp 251-265.

Baginska E, Haiss A, Kümmerer K (2015). Biodegradation screening of chemicals in an artificial matrix simulating the water-sediment interface. Chemosphere. 2015 Jan;119:1240-6.

Andreja Žgajnar Gotvajn, Jana Zagorc-Koncan (1996). Comparison of biodegradability assessment tests for chemical substances in water. Water Science and Technology, Volume 33, Issue 6, 1996, Pages 207–212.
Reason / purpose for cross-reference:
data waiving: supporting information

Description of key information

The substance strontium diacetate is composed of two ions : Sr2+ ion and acetate ion.

Strontiun ion is inorganic, consequently according to the § 9.2.1.1. in column 2, annex VII of REACH the study does not need to be conducted. Only the organic part (acetate) is relevant.

Acetate ion is part of a substance (sodium acetate) considered as readily biodegradable since it is used as control substance in OECD tests. This susbtance have been used in several studies in biodegradability test method development and have been identified as readily biodegradable. The report attached (MCC report 007) summaries the pratical experience on sodium acetate and is based on different references (Nyholm 1996 ; O’Malley 2006 ; Baginska 2015 ; Andreja Žgajnar Gotvajn 1996).

Consequently the substance is considered as readily biodegradable.

Key value for chemical safety assessment

Biodegradation in water:
readily biodegradable
Type of water:
freshwater

Additional information

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