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Environmental fate & pathways

Additional information on environmental fate and behaviour

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Administrative data

Endpoint:
additional information on environmental fate and behaviour
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2022
Reliability:
1 (reliable without restriction)

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2022
Report date:
2022

Materials and methods

Test guideline
Qualifier:
according to guideline
Guideline:
other: OECD 29 Guidance Document on Transformation/Dissolution of Metals and Metal Compounds in Aqueous Media.
Version / remarks:
July 2001
GLP compliance:
yes

Test material

Constituent 1
Chemical structure
Reference substance name:
Tellurium
EC Number:
236-813-4
EC Name:
Tellurium
Cas Number:
13494-80-9
Molecular formula:
Te
IUPAC Name:
tellurium
Test material form:
solid: particulate/powder
Details on test material:
- Name of test material (as cited in study report): Tellurium powder
- Substance type: inorganic

Referenceopen allclose all

Constituent 1
Reference substance name:
Disodium tetraoxotellurate
EC Number:
233-259-5
EC Name:
Disodium tetraoxotellurate
Cas Number:
10101-83-4
Molecular formula:
Na2TeO4
IUPAC Name:
disodium tetraoxotellurate
Test material form:
solid
Constituent 1
Chemical structure
Reference substance name:
sodium tellurite
Cas Number:
10102-20-2
Molecular formula:
Na2O3Te
IUPAC Name:
sodium tellurite
Specific details on test material used for the study:
sodium tellurate (VI) and sodium tellurite (IV) have been used as stadards to identify dissolved tellurium species

Results and discussion

Any other information on results incl. tables

For the test at nominal pH 6 at a loading of 100 mg/L Tellurium, average dissolved concentrations of:
• 1.46 ± 0.20 mg/L Tetotal (CVoverall = 14 %; N = 9),
• 1.49 ± 0.20 mg/L Te(IV) (CVoverall = 14 %; N = 9),
• 0.003 ± 0.001 mg/L Te(VI) (CVoverall = 34 %; N = 9),
were found at the 24 hours endpoint.
Based on the tellurium content in the test item and the average dissolved concentrations in the test solutions:
• a release of tellurium of 1.5 % of the content,
• a release of tellurium(IV) of 1.5 % of the content,
• a release of tellurium(VI) of 0.003 % of the content,
could be calculated at the 24 hours endpoint in test medium at pH 6.
For the test at nominal pH 8 at a loading of 100 mg/L Tellurium, average dissolved concentrations of:
• 12.7 ± 0.4 mg/L Tetotal (CVoverall = 3 %; N = 9),
• 12.5 ± 0.3 mg/L Te(IV) (CVoverall = 2 %; N = 9),


• 0.006 ± 0.002 mg/L Te(VI) (CVoverall = 30 %; N = 9),
were found at the 24 hours endpoint.
Based on the tellurium content in the test item and the average dissolved concentrations in the test solutions:
• a release of tellurium of 13 % of the content,
• a release of tellurium(IV) of 13 % of the content,
• a release of tellurium(VI) of 0.006 % of the content,
could be calculated at the 24 hours endpoint in test medium at pH 8.

Applicant's summary and conclusion

Conclusions:
During this study on Tellurium at a loading of 100 mg/L, it was shown that:
• For total tellurium, an average concentration of 1.46 mg/L Tetotal (CVoverall = 14 %; N = 9) was measured at pH 6 (i.e. 1.5 % total tellurium release) and 12.7 mg/L Tetotal (CVoverall = 3 %; N = 9) at pH 8 (i.e. 13 % total tellurium release),
• For tellurium(IV), an average concentration of 1.49 mg/L Te(IV) (CVoverall = 14 %; N = 9) was measured at pH 6 (i.e. 1.5 % tellurium(IV) release) and 12.5 mg/L Te(IV) (CVoverall = 2 %; N = 9) at pH 8 (i.e. 13 % tellurium(IV) release),
• For tellurium(VI), an average concentration of 0.003 mg/L Te(VI) (CVoverall = 34 %; N = 9) was measured at pH 6 (i.e. 0.003 % tellurium(VI) release) and 0.006 mg/L Te(VI) (CVoverall = 30 %; N = 9) at pH 8 (i.e. 0.006 % tellurium(VI) release),
after 24 hours of exposure to the test medium at pH 6 and 8, respectively.
Based on the rounded results of the dissolved element concentrations, we may conclude that nominal “pH 8” is the pH where the highest dissolved tellurium concentrations, available as Te(IV), were measured. Only traces of Te(VI) could be detected.
The results can be assumed reliable since the test conditions stayed constant during the experiment.