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Diss Factsheets

Administrative data

Endpoint:
transformation / dissolution of metals and inorganic metal compounds
Type of information:
experimental study
Adequacy of study:
key study
Study period:
October 2019
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2019

Materials and methods

Test guideline
Qualifier:
according to guideline
Guideline:
OECD Series on Testing and Assessment No. 29 (23-Jul-2001): Guidance document on transformation/dissolution of metals and metal compounds in aqueous media
GLP compliance:
no
Other quality assurance:
ISO/IEC 17025 (General requirements for the competence of testing and calibration laboratories)
Type of method:
flask method

Test material

Constituent 1
Chemical structure
Reference substance name:
Phosphoric acid, iron(2+) lithium manganese(2+) salt (10:3:10:7)
EC Number:
943-492-0
Cas Number:
1354700-46-1
Molecular formula:
Li(Fe0.3Mn0.7)PO4
IUPAC Name:
Phosphoric acid, iron(2+) lithium manganese(2+) salt (10:3:10:7)
Test material form:
solid: particulate/powder

Results and discussion

Solubility of metal ions in aqueous mediaopen allclose all
Key result
Type of test:
screening transformation/dissolution test - sparingly soluble metal compounds
Mean dissolved conc.:
86 µg/L
Element analysed:
Iron
Loading of aqueous phase:
100 mg/L
Incubation duration:
24 h
Test conditions:
pH 6
Key result
Type of test:
screening transformation/dissolution test - sparingly soluble metal compounds
Mean dissolved conc.:
880 µg/L
Element analysed:
Mn
Loading of aqueous phase:
100 mg/L
Incubation duration:
24 h
Test conditions:
pH 6
Key result
Type of test:
screening transformation/dissolution test - sparingly soluble metal compounds
Mean dissolved conc.:
893 µg/L
Element analysed:
Li
Loading of aqueous phase:
100 mg/L
Incubation duration:
24 h
Test conditions:
pH 6
Details on results:
The following observations could be made in the test vessels at the nominal pH 6 with a loading of 100 mg/L LMFP EXM6001 (Annex 2b):
 An average dissolved concentration of 83 ± 17 μg/L Fe was found at the 24 hours endpoint with a between-vessel coefficient of variation of 20 % (N = 3) which met the <20 % quality criterion at the 24 hours endpoint. The within-vessel coefficients of variation met the <10 % quality criterion for all test vessels.
Based on the specific surface area of the LMFP EXM6001 powder (i.e. 30 m²/g test item, Annex 7), an iron release per surface of 0.028 mg/m² was calculated at the 24 hours endpoint.
Based on the iron content of the test item (10.2 %Fe, Annex 7) and the average dissolved iron concentration, an iron release of approximately 0.81 % could be calculated at the 24 hours endpoint.
 An average dissolved concentration of 893 ± 40 μg/L Li was found at the 24 hours endpoint with a between-vessel coefficient of variation of 4 % (N = 3) which met the <20 % quality criterion at the 24 hours endpoint. The within-vessel coefficients of variation met the <10 % quality criterion for all test vessels.
Based on the specific surface area of the LMFP EXM6001 powder (i.e. 30 m²/g test item, Annex 7), a lithium release per surface of 0.30 mg/m² was calculated at the 24 hours endpoint.
Based on the lithium content of the test item (4.5 % Li, Annex 7) and the average dissolved lithium concentration, a lithium release of approximately 20 % could be calculated at the 24 hours endpoint.

Applicant's summary and conclusion

Conclusions:
During this study on LMFP EXM6001 at a loading of 100 mg/L, it was shown that:
• For iron, an average concentration of 83 μg/L Fe (CVoverall = 17 %; N = 9) was measured at pH 6 (i.e. 0.81 % iron release) and <3 μg/L Fe (N = 9) at pH 8 (i.e., <0.029 % iron release),
• For lithium, an average concentration of 893 μg/L Li (CVoverall = 4 %; N = 9) was measured at pH 6 (i.e. 20 % lithium release) and 574 μg/L Li (CVoverall = 3 %; N = 9) at pH 8 (i.e., 13 % lithium release),
• For manganese, an average concentration of 880 μg/L Mn (CVoverall = 8 %; N = 9) was measured at pH 6 (i.e. 3.7 % manganese release) and 234 μg/L Mn (CVoverall = 6 %; N = 9) at pH 8 (i.e., 1.0 % manganese release),
after 24 hours of exposure to the test medium at pH 6 and pH 8, respectively.
Based on the rounded results, of the dissolved element concentrations, we may conclude that pH 6 is the pH where the highest concentrations of iron, lithium and manganese were measured.
The results can be assumed reliable since the test conditions stayed constant during the experiment.