Study of the Solubility of Bismuth,Bismuth Oxide and Bismuth Sulfide in the Acetic Acid Solution of Thiourea

Bismuth(Ⅲ) reacts with thiourea and form a colored complex at which of the maximum absorption is 460 nm wavelength.The relationship between the absorptions and the concentrations of Bi(III) in the range of 0.059~5.7 μg/mL obeys Beer's Law.The regression equation was Y=0.0117+0.17319X with the correlation coefficient R=0.9999.The relative standard deviation(RSD) was 2.66% and the detection limit was 0.013 μg/mL.The molar absorptivity was 3.72×104 L · mol-1 · cm-1.The experimental results show that the solubility of the bismuth oxide,bismuth and bismuth sulfide in the acetic acid solution of thiourea was 0.077,1.347 and 1.245 μg/mL,respectively.The order of solubility increases as bismuth oxide bismuth sulfide bismuth.The recoveries for bismuth oxide,bismuth and bismuth sulfide were 97.4%,98.1% and 96.6%,respectively.