甲基三苯基溴化鏻-碘化钾-汞体系的共振光散射光谱及其应用

Resonance light scattering spectrum of methyltriphenylphosphonium bromide-potassium iodide-mercury system and its application

在十二烷基硫酸钠（SLS）存在条件下，KI和Hg^2＋形成的络阴离子[HgI4]^2-与甲基三苯基溴化鳞（MTPB）结合形成的离子缔合物能使共振光散射（RLS）光谱强度明显增强，据此建立了测定汞的新方法。在最佳实验条件下，最大散射波长在383nm处，体系的共振光散射强度与汞的质量浓度在0．04～1．8μg／mL范围内呈良好的线性关系，检出限可达0．0013μg／mL。此方法已用于合成水样、地表水和工业污水中汞的测定，回收率在95．0％～103．5％之间，相对标准偏差范围1．5％～2．9％。

In the presence of sodium dodecyl sulphate （SLS）, the complex anion [HgI4 ]2- formed by KI and Hg^2＋ combined with methyltriphenylphosphonium bromide （MTPB） to form a ion-association complex,which made resonance light scattering （RLS） intensity to increase evidently. On the basis of this principle, a new method has been developed for the determination of mercucry . Under the optimum condition, the maximum scattering wavelength was found to be 383 nm. A good linear relationship between the enhanced RLS intensity and the mass concentration of mercucry was in the range of 0.04--1.8 μg/mL with a detection limit of 0. 001 3 μg/mL. This method had been applied to the determination of mercucry in synthetic samples, surface water, and industry sewerage samples with the recovery between 95.0%-103.5 % and the standard deviation in the range of 1.5%-2.9%.