The Te(VI) solution was prepared from sodium tellurate
([Na.sub.2]Te[O.sub.4] x 2[H.sub.2]O) (Alfa Aesar, USA) in 10% (v/v) hydrochloric acid.
Banerjee et al  uses copper(III) periodate and copper(III) tellurate as oxidants for oxidative decarboxylation of [alpha]-hydroxyacids.
The reagent is easily prepared by heating Cu(II) salt with potassium persulphate as an oxidizing agent in presence of a bulky ligand like tellurate or iodate in alkaline medium of potassium hydroxide [3,8,26,27].
This is batch leached with 5% calcium oxychloride, [CaO(Cl).sub.2], and 5% sodium hydroxide to dissolve and precipitate the tellurium as calcium tellurate
Indeed, Te(IV) and Te(VI) can interact with thiol groups and this interaction is involved in the toxicity of inorganic tellurite and tellurate (Figure 2).
Tang et al., "The organotellurium compound ammonium trichloro(dioxoethylene-0,0') tellurate enhances neuronal survival and improves functional outcome in an ischemic stroke model in mice," Journal of Neurochemistry, vol.
(1995) Frankhawthorneite, a unique HCP framework structure of a cupric tellurate
. Canadian Mineralogist 33, 649-653.
Scalenohedral calcite crystals were observed in vugs on top of penroseite and with clausthalite and chalcopyrite associated with overgrowths of tellurates
Selenates and Tellurates
; Selenites and Tellurites: Classes 33-34, 20 pages, 67 descriptions, 3.35 per page
(Behind the Iron Curtain this trip was represented as a "lecture tour," and Martin's specimens, including benitoite and newly descfibed tellurites and tellurates
, were "samples" for the "lectures." Other "samples" included cigarettes, nylon stockings, etc.).