Citation: Mei FANG, Shou Kun HU. STUDY AND APPLICATION OF SPECTROPHOTOMETRIC DETERMINATION OF MICRO AMOUNTS OF BISMUTH WITH MESO-TETRAKIS-(4-N-TRIMETHYL AMMONIUMPHENYL) PORPHINE[J]. Chinese Chemical Letters, ;1991, 2(10): 789-792. shu

STUDY AND APPLICATION OF SPECTROPHOTOMETRIC DETERMINATION OF MICRO AMOUNTS OF BISMUTH WITH MESO-TETRAKIS-(4-N-TRIMETHYL AMMONIUMPHENYL) PORPHINE

Mei FANG ,
Shou Kun HU

Department of Chemistry, Sichuan University, Chengdu 610064

Received Date: 13 May 1991

A new highly sensitive spectrophotometric method has been developed for the determination of micro amounts of bismuth (Ⅲ), based on the formation of Bi (Ⅲ)-meso-tetrakis-(4-N-trimethylammonium phenyl) porphine [T (4TMAP) P] complex. In the presence of Cd (Ⅱ), Bi (Ⅲ) reacts almost instantaneously with T (4TMAP) P in a 0. 6 mol/l NaAc-HAC buffer (PH5.8) at room temperature. The composition of the complex is T (4TMAP) P:Bi=1:1. The absorbance complex obeys Beer's law over the Bi (Ⅲ) concentration range 0.1-1.4 μg/ml. The linear relative coefficient γ is 0.9998. The apparent molar absorptivity was 1.75×10⁵ 1.mol^-1. cm^-1 at 463nm. The relative standard deviation of the method is 1.50% for Bi (Ⅲ) 7ug/10ml (10 determinations). The interference of foreign ions has been examined. This simple and rapid method can be applied to the assay of Bi (Ⅲ) in some tablets directly.
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