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Synthesis of bismuth citrate for medicine

The interaction of solid basic bismuth nitrate (BBN) with citric acid solutions is studied. The formation of bismuth citrate of the type BiC<sub>6</sub>H<sub>5</sub>O<sub>7</sub> occurs in the temperature range 50-70degC at pH 0.5-0.7. The obtained product is characterized by the methods of chemical analysis, X-ray powder diffraction, IR spectroscopy and differentional thermal analysis. The method of synthesis of bismuth citrate BiC<sub>6</sub>H<sub>5</sub>O<sub>7</sub> by the solid-liquid reaction is compared with the precipitate method from nitric acid solutions.