碘化物-CTMAB体系共振光散射法测定铋

Resonance Scattering Spectrometric Determination of Bismuth by the Reaction with Iodide and Cetyl-Trimethyl Ammonium Bromide

用简易荧光计研究了在微酸性介质中，铋-碘化钾-十六烷基三甲基溴化铵（CTMAB）体系的共振光散射光谱，考查了光谱特征、影响因素和适宜的反应条件；确定了散射光强度与溶液中铋浓度的关系，提出了共振光散射法测定铋的方法；该法在室温下进行，线性范围为0．2～0．6mg·L^-1，方法的检出限0．003mg·L^-1；用于胃药中铋的测定，并在此样品的基础上加入铋（Ⅲ）标准进行了回收试验，得回收率结果为107．3％。

Resonance sacttering spectrometry of the reaction among Bi^3＋ , KI and CTMAB in a weakly acidic solution of pH 3.7 buffered＇ with formate buffer solution was studied with a simple fluorospectrophotomer, including observation of its spectral characteristics, testing of influential factors to the reaction and choice of suitable conditions for the reaction. Linear relationship was kept between the magnitude of scattered light intensity （measured at 440 nm） and the corresponding concentration of bismuth ion in the range from 0. 2-0. 6 mg·L^-1 under room temperature. Detection limit （3 S） of the method was found to be 0. 003 mg·L^-1. The proposed method was used in the determination of bismuth in a sample of bismuth aluminate, a drug for stomach disease; and test for recovery was made by adding bismuth standard to this sample, giving value of recovery equal to 107. 3%.