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Diss Factsheets

Environmental fate & pathways

Biodegradation in water: screening tests

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Administrative data

Link to relevant study record(s)

Reference
Endpoint:
biodegradation in water: ready biodegradability
Type of information:
experimental study
Adequacy of study:
key study
Study period:
1988-10-13 to 1988-10-14
Reliability:
1 (reliable without restriction)
Reason / purpose for cross-reference:
reference to same study
Reason / purpose for cross-reference:
reference to other study
Qualifier:
according to guideline
Guideline:
EU Method C.6 (Degradation: Chemical Oxygen Demand)
Deviations:
no
Qualifier:
according to guideline
Guideline:
other: NEN 6633: Determination of the Chemical Oxygen Demand; Nederlands Normalisatie Instituut; Oct. 1987;
Deviations:
no
Principles of method if other than guideline:
no
GLP compliance:
yes
Oxygen conditions:
not specified
Inoculum or test system:
not specified
Details on inoculum:
NA
Details on study design:
NA
Preliminary study:
NA
Test performance:
NA
Key result
Parameter:
other: The chemical oxygen demand (COD) of the test substance was determined to be negligible (26E-03 g COD per g test substance).
Remarks on result:
other: The chemical oxygen demand (COD) of the test substance was determined to be negligible (26E-03 g COD per g test substance).
Details on results:
no
Parameter:
COD
Value:
0.03 other: g COD/g test mat.
Results with reference substance:
no reference substance

no remarks

Validity criteria fulfilled:
not specified
Conclusions:
Diammonium peroxodisulfate was tested for the Chemical Oxygen Demand in a test according to EU Guideline C.6
The chemical oxygen demand (COD) of diammonium persulfate was determined to be negligible (26E-03 g COD per g test substance).
Executive summary:

In a triplicate experiment, the chemical oxygen demand was determined to be negligible (26E-03 g COD/g test substance (individual values: 26E-03, 26E-03 and 25 E-03 g COD/g diammonium persulfate, respectively). Upon contact with water or water vapour substances of the Persulfate Category hydrolyse into cation and persulfate anion. Hydrolysis is temperature and pH dependent and decomposition rates increase with decreasing pH value and increasing temperature. The persulfate anion, independent of the cation, undergoes further decomposition in normal water or acid conditions, readily oxidizing water to oxygen, producing sulphate and hydrogen ions. All persulfate decomposition products are ubiquitous to the environment. Hydrolysis is metal catalyzed, and rapid reaction with organic matter also are possible.

Description of key information

Diammonium persulfate was tested for Chemical Oxygen Demand in according to EU Guideline C.6. The chemical oxygen demand (COD) of a sample was determined to be negligible (26E-3 g COD per g test substance).

Key value for chemical safety assessment

Additional information

In a triplicate experiment, the chemical oxygen demand was determined to be negligible (26E-03 g COD/g diammonium persulfate) (individual values: 26E-03, 26 E-03 and 25 E-03 g COD/g diammonium persulfate, respectively). Upon contact with water or water vapour substances of the Persulfate Category hydrolyse into cation and persulfate anion. Hydrolysis is temperature and pH dependent and decomposition rates increase with decreasing pH value and increasing temperature. The persulfate anion, independent of the cation, undergoes further decomposition in normal water or acid conditions, readily oxidizing water to oxygen, producing sulphate and hydrogen ions. All persulfate decomposition products are ubiquitous to the environment. Hydrolysis is metal catalyzed, and rapid reaction with organic matter also are possible.