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Diss Factsheets

Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

Administrative data

Endpoint:
toxicity to aquatic algae and cyanobacteria
Type of information:
calculation (if not (Q)SAR)
Remarks:
Migrated phrase: estimated by calculation
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: automatic calculation tool in development at Eurometaux
Cross-referenceopen allclose all
Reason / purpose for cross-reference:
reference to same study
Reason / purpose for cross-reference:
reference to other study

Data source

Reference
Reference Type:
other: software
Title:
Unnamed
Year:
2010

Materials and methods

Principles of method if other than guideline:
Aquatic toxicity of the UVCB substance was determined by classifying based on Mixture rules from EU CLP (summation of classified components to derive hazard class) and back calculation to the corresponding L(E)C50 range.
GLP compliance:
no
Remarks:
equivalent quality assurance

Test material

Constituent 1
Reference substance name:
Slimes and Sludges, battery scrap, antimony- and lead-rich
EC Number:
310-061-8
EC Name:
Slimes and Sludges, battery scrap, antimony- and lead-rich
Cas Number:
102110-60-1
Molecular formula:
Molecular weigth/formula concept not applicable to Inorganic UVCB (comlex metal containing substance)
IUPAC Name:
Slimes and Sludges, battery scrap, antimony- and lead-rich
Details on test material:
Elemental composition of maximum of typicals across industry: IUCLID Section 1.2
Representative sample(s) for mineralogical information: IUCLID Section 4.23

Results and discussion

Effect concentrations
Duration:
72 h
Dose descriptor:
EC50
Effect conc.:
<= 1 mg/L
Nominal / measured:
estimated
Conc. based on:
dissolved
Basis for effect:
other: most sensitive species

Any other information on results incl. tables

The derived classification result (via application of mixture toxicity rules) for both grades defined in section 1.2 is "Chronic Category 1; H410". The key driver for environmental classification is Pb compounds (maximum of typical used to derive the classification: 75.2% lead which is equal to ca. 66% lead compounds since 87.73% of lead is present in the compounds form and 12.27% in metal (powder) form (according to reference sample OR25, see section 4.23)) : 10* % Pb compounds > 25%.

Based on this result, the related criteria provided the estimated value for chronic (long term) toxicity to aquatic algae (see EU CLP Guidance Annex I Table 4.1.0): 72h EC50 (for algae) < or equal to 1 mg/L.

Applicant's summary and conclusion

Conclusions:
Good quality estimate of the EC50 (algae) of the UVCB substance. The derived classification result (via application of mixture toxicity rules) for both grades defined in section 1.2 is "Chronic Category 1; H410". The key driver for environmental classification is Pb compounds (maximum of typical used to derive the classification: 75.2% lead which is equal to ca. 66% lead compounds since 87.73% of lead is present in the compounds form and 12.27% in metal (powder) form (according to reference sample OR25, see section 4.23)): 10* % Pb compounds > 25%.
Based on this result, the related criteria provided the estimated value for chronic (long term) toxicity to aquatic algae (see EU CLP Guidance Annex I Table 4.1.0): 72h EC50 (for algae) < or equal to 1 mg/L.
Executive summary:

The study provided a conservative estimate of the EC50 (algae), derived on the basis of the classification outcome (Mixture toxicity rules) from a reasonable worst case sample (maximum of typicals for every constituent) across industry for Slimes and Sludges battery scrap Sb, Pb rich Grade 1 and Grade 2 as defined in IUCLID section 1.2 and the mineralogical information from representative samples (IUCLID section 4.23). The classification result for both grades is "Chronic Category 1; H410" resulting in an 72h EC50 (for algae) < or equal to 1 mg/L. The key driver for environmental classification is Pb compounds

(maximum of typical used to derive the classification: 75.2% lead which is equal to ca. 66% lead compounds since 87.73% of lead is present in the compounds form and 12.27% in metal (powder) form (according to reference sample OR25, see section 4.23)) : 10* % Pb compounds > 25%.

Validity of the model used:

1. Defined end points: Chronic aquatic toxicity

2. Unambiguous algorithm from EU CLP Guidance: summation formula to determine classification, followed by back-calculation to related hazard criteria

3. Applicability domain: applicable to classify complex metal containing materials. Available input information: elemental composition and representative mineralogical information (no correction for bio availability)

4. Mechanistic interpretation - metal species: the tool translates the elemental composition into a mineralogical composition relevant for classification (ie distribution pattern for each element/constituent of the UVCB substance). The classification is derived (by means of the Summation formula) without taking into account any bio availability correction.  

 

Adequacy of prediction: the substance falls within the applicability domain described above and, therefore, the predicted value can be considered as reliable. The prediction is moreover conservative since only elemental composition and mineralogy is known, no T/D data is available. Same conclusions apply to the prediction of the aquatic toxicity value.