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EC number: 231-193-1 | CAS number: 7446-07-3
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:
- 2022
- Reliability:
- 1 (reliable without restriction)
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 2 022
- 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
- Reference substance name:
- Tellurium dioxide
- EC Number:
- 231-193-1
- EC Name:
- Tellurium dioxide
- Cas Number:
- 7446-07-3
- Molecular formula:
- O2Te
- IUPAC Name:
- tellurium dioxide
- Reference substance name:
- oxotellan oxide
- IUPAC Name:
- oxotellan oxide
- Test material form:
- solid: particulate/powder
- Details on test material:
- - Name of test material (as cited in study report): Tellurium dioxide
- Substance type: inorganic
Constituent 1
Constituent 2
- 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
- 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 standards to identify dissolved tellurium species
- Conclusions:
- During this study on Tellurium dioxide at a loading of 100 mg/L, it was shown that:
• For total tellurium, an average concentration of 0.383 mg/L Tetotal (CVoverall = 33 %; N = 9) was measured at pH 6 (i.e. 0.48 % total tellurium release) and 1.80 mg/L Tetotal (CVoverall = 13 %; N = 9) at pH 8 (i.e. 2.3 % total tellurium release),
• For tellurium(IV), an average concentration of 0.389 mg/L Te(IV) (CVoverall = 33 %; N = 9) was measured at pH 6 (i.e. 0.49 % tellurium(IV) release) and 1.79 mg/L Te(IV) (CVoverall = 13 %; N = 9) at pH 8 (i.e. 2.2 % tellurium(IV) release),
• For tellurium(VI), an average concentration of <0.002 mg/L Te(VI) (N = 9) was measured at pH 6 (i.e. <0.003 % tellurium(VI) release) and 0.002 mg/L Te(VI) (CVoverall = 24 %; N = 9) at pH 8 (i.e. 0.003 % 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.
Referenceopen allclose all
Constituent 1
Constituent 1
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 dioxide, average dissolved concentrations of:
• 0.383 ± 0.125 mg/L Tetotal (CVoverall = 33 %; N = 9),
• 0.389 ± 0.129 mg/L Te(IV) (CVoverall = 33 %; N = 9),
• <0.002 mg/L Te(VI) (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 0.48 % of the content,
• a release of tellurium(IV) of 0.49 % 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 dioxide, average dissolved concentrations of:
• 1.80 ± 0.23 mg/L Tetotal (CVoverall = 13 %; N = 9),
• 1.79 ± 0.24 mg/L Te(IV) (CVoverall = 13 %; N = 9),
• 0.002 ± 0.001 mg/L Te(VI) (CVoverall = 24 %; 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 2.3 % of the content,
• a release of tellurium(IV) of 2.2 % 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 8.
Applicant's summary and conclusion
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