Abstract
A simple and sensitive spectrophotometric method for the determination of trace amounts of bismuth is established. The method is based on the reaction of bismuth with bromopyrogallol red at pH 3 in the presence of a mixture of cetylpyridinium chloride and triton X-100 surfactants to form a blue coloured complex which shows maximum absorbance at 644 nm. A plot of absorbance with bismuth concentration gives a straight line indicating that Beer,s law has been obeyed over the range 3-150 µg/25 ml, i.e., 0.12-6 ppm with a molar absorptivity of 3.3×104 l.mol-1.cm-1 and Sandell,s sensitivity index of 0.006 µg.cm-2. The interfering effect of a number of common captions and anions in the presence of comosite mixture (NaF and tartaric acid) and ascorbic acid as masking agents has been studied. The effect of common excipients has also been examined. The method has been applied successfully to the determination of bismuth in water samples and a veterinary preparation.
Highlights
A simple and sensitive spectrophotometric method for the determination of trace amounts of bismuth is established
Bismuth salts have emerged as efficient lewis acids due to their relatively low toxicity, it used a catalyzed route for the synthesis ofα-aminophosphonates from aldehydes . (Banik et al, 2010)
Preliminary studies of the reaction of bismuth (III) with Bromopyrogallol Red (BPR) reagent indicate that the reaction proceed immediately after mixing
Summary
Preliminary studies of the reaction of bismuth (III) with BPR reagent indicate that the reaction proceed immediately after mixing. The violet coloured complex showed an absorption maximum at 597nm in contrast to the reagent blank which shows maximum absorption at 522nm. Effect of pH The effect of pH on the colour intensity of the complex is studied with solutions containing 100 μg of Bismuth (III) and various volumes of 0.01M HNO3 and NaOH solutions and 2 ml of (1×10-3M) BPR reagent and the volume is completed to 25ml with distilled water. The results are given in Table (1) It can be noticed in Table (1) that buffer solution (B4) is only useful from the analytical point of view. The effect of the presence of cationic (Cetylpyridinium chloride, CPC, Cetyltrimethylammonium bromide, CTAB), anionic (Sodium dodecyl sulphate, SDS) and non- ionic (Iso-octylphenoxypolyethoxy ethanol, Triton X-100) surfactants on the colour intensity of the complex is examined with different orders of addition.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
