Registration Dossier

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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Tellurium exists mainly as Te(IV) and Te(VI) in natural waters and geological samples and its geochemistry is considered comparable to that of selenium.In the oxidative zone of weathering at or near the earth's surface, tellurium is readily oxidized to tellurites (Te03 2-) from tellurides (Te2-) through the normal pH range of 3-8.At relatively high, but feasible, oxidation potentials, tellurites are oxidized to tellurates (Te04 2-) in alkaline environments (pH 6-8.5).

Based on the results of a transformation dissolution screening and determination of the dissolved element concentrations, it is concluded that dissolved tellurium is predominantly available as Te(IV).

Additional information