Hydrolytic method for processing bismuth to obtain compounds

The hydrolytic processing of metallic bismuth to obtain compounds was investigated by methods of chemical, X-ray diffraction analyses, thermogravimetric analyzes, as well as electron microscopy. The conditions for obtaining bismuth nitrate pentahydrate composition Bi(NO3)3∙5H2O, oxide, citrate of bismuth of composition BiС6Н5O7, bismuth-potassium-ammonium citrate and oxohydroxotribromophenolate of bismuth of the pharmacopoeial composition [Bi6O6(OH)2](C6H2Br3O)4 Xeroform are presented.

A Novel Spectrophotometric Method for Determination of Chloramphenicol Based On Diazotization Reaction at Room Temperature

An analytical method for determination of chloramphenicol (CAP) based on the diazotization reaction at room temperature has been developed. The CAP was reduced using zinc powder (Zn) and diazotization reaction was carried out at room temperature in the presence of NaNO2, bismuth nitrate pentahydrate (Bi(NO3)3.5H2O) as catalyst. 2-napthol was used as coupling agent to form a red-violet solution and the absorbance was measured by UV-Vis spectrophotometer at 554 nm. The optimization of analytical parameters including reducing agent, catalyst, coupling agent and time response were 0.15 g, 0.15 g, 230.67 µg/mL and 8-9 min respectively.