Search Results - "Delchev, Vassil Borisov"

Vanadium-Containing Anionic Chelate for Spectrophotometric Determination of Hydroxyzine Hydrochloride in Pharmaceuticals by Kirova, Gergana Kirilova, Velkova, Zdravka Yancheva, Delchev, Vassil Borisov, Gavazov, Kiril Blazhev

“…Four azo dyes known to form anionic complexes with V(V) were investigated as potential liquid-liquid extraction-spectrophotometric reagents for the…”
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A 2:2:2 Complex of Vanadium(V) with 4-(2-Thiazolylazo)orcinol and 2,3,5-Triphenyl-2H-Tetrazolium Chloride by Gavazov, Kiril Blazhev, Delchev, Vassil Borisov, Mileva, Kremena Tomova, Stefanova, Teodora Stefcheva, Toncheva, Galya Kostadinova

“…The complex formation in the vanadium(V)/4-(2-thiazolylazo)orcinol (TAO)/2,3,5-triphenyl-2H-tetrazolium chloride (TTC) liquid-liquid extraction-chromogenic…”
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Extraction System for the Spectrophotometric Determination of Tungsten(VI) with 4-Nitrocatechol and Benzalkonium Chloride by Divarova, Vidka Vassileva, Stojnova, Kirila Trifonova, Radkovska, Ivelina Dobromirova, Saravanska, Antoaneta Dimitrova, Toncheva, Galya Kostadinova, Delchev, Vassil Borisov, Gavazov, Kiril Blazhev

“…A novel chromogenic system for the liquid-liquid extraction and determination of trace amounts of tungsten(VI) was investigated. The system comprises…”
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