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Environmental fate & pathways

Additional information on environmental fate and behaviour

Administrative data

Endpoint:
additional information on environmental fate and behaviour
Type of information:
experimental study
Adequacy of study:
key study
Study period:
From August 12 to 13, 1998
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
test procedure in accordance with generally accepted scientific standards and described in sufficient detail

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
1999
Report date:
1999

Materials and methods

Test guideline
Qualifier:
no guideline followed
Principles of method if other than guideline:
Internal method: U.Pagga, K.Taeger. Development of a method for adsorption of dyestuffs on activated sludge. Wat. Res, 1051-1057, 1994.
GLP compliance:
yes
Type of study / information:
Evaluation of the adsorption potential on activated sludge and determination of the elimination percentage of the substance from water.

Test material

Constituent 1
Reference substance name:
Acid Green 001
IUPAC Name:
Acid Green 001
Test material form:
solid

Results and discussion

Any other information on results incl. tables

Colour elimination by adsorption on activated sludge: <10 % after 1 day

DOC elimination by adsorption on activated sludge: <10 % after 1 day

Preliminary investigations

TOC(mg/g) = 316

DOC (mg/g) = 316

Test Results

Vessel BC1 TS1                             TS2                          
colour elimination DOC elimination
Concentration test substance nominal value (mg/l) - 52.1 325
DOC concentration test substance (nominal value) (mg/l) - - 1.0
Absorption value test subslance (nominal value) - 0.9 -

Values: Elimination (%)
Date Days

TS1           

        

BC1

                   

TS2  

        

TS1   

                               

TS2         

                  

    absorption values  mg/l DOC  mg/l DOC colour elimination DOC elimination
12.08.98 0 1.143 0.5 0.3 132 131 0 0
12.08.98 0.125 0.879 3.6 4.1 97.0 100 0 6
13.08.98 1 0.928 5.9 5.9 108 111 -5 -3

BC = blank control, TS= test substance, DS=dry substance

Remarks

DOC values below the limit of detectability of 0.1 mg/l are indicated as 0.0

Water hardness in the test vessel: 2.5 mmol/l (14 °dH)

To gel the correct reference varues for the determination DOC elimnation and coIour elimination the measured data must be multiplicated with 0.77.

Applicant's summary and conclusion

Conclusions:
The test substance is not sufficiently eliminated from water.
Executive summary:

Method:

The adsorption potential of the substance on activated sludge was evaluated in a static test, according to an internal mehod. The substance was incubated for 24 hours with the activated sludge, after which, the color elimination and Dissolved Organic Carbon (DOC) elimination were measured.

Results

Colour elimination by adsorption on activated sludge: <10 % after 1 day

DOC elimination by adsorption on activated sludge: <10 % after 1 day

Conclusion

The test substance is not sufficiently eliminated from water.

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