Sulfates barium BaSC

Barium sulfate. [CAS1 7727-43-7]. BaSC>4, white precipitate. =... 

Strontium, Barium Strontium was discovered near, and named after, the small town of Strontian, Scotland, in 1787. There are no commercial uses for the pure metal, but the carbonate salt, SrC03, is used in the manufacture of glass for color TV picture tubes. Barium is found principally in the minerals witherite (BaC03) and barite (BaSC ), after which it is named. Though water-soluble salts of barium are extremely toxic, barium sulfate is so insoluble that it is used in medicine as a contrast medium for stomach and intestinal X rays. Like strontium, barium metal has no commercial uses, but various compounds are used in glass manufacture and in drilling oil wells. 

Figure 6 shows the CTL spectra observed during the catalytic oxidation of ethanol on y-alumina, calcium carbonate, and barium sulfate. The profiles of these broad spectrum components are similar to each other, and they peak in the vicinity of 420 nm. The profiles of the CTL spectra from the excited species depend on the kind of catalyst. Fine spectra are observed in the non-porous BaSC>4 catalyst. In Fig. 6b, the thin curves denote the fine spectrum components obtained by the peak-fitting technique. 

For the determination of elements of which the most sensitive lines are in the VUV spectral region, conventional AAS cannot be applied. Indirect methods can be used here, as they can for the determination of chemical compounds. Sulfates, for instance, can be determined by their precipitation as BaSC>4, and then the excess of barium used can be determined with AAS. A similar approach can be used for the determination of the halogenides after their precipitation with silver. 

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