催化动力学-流动注射停流分光光度法测定微量汞的研究

Catalytic kinetic-stopped-FIA automatic method for determination of microcontent mercury

设计了分光光度自动分析系统的硬、软件 ,利用汞 ( )对藏红 T-碘化钾体系的催化褪色作用 ,建立了微量汞的催化动力学 -流动注射停流分光光度自动测定方法。Hg( )含量在 0～ 6.0 μg/m L范围内符合比尔定律 ,检出限为 3.5×1 0 -7g/m L,分析频率为 2 0 s/h。方法用于合成样品及污水中汞的测定 ,回收率为95.6%和 98.5% ,相对标准偏差为 5.1 %和 4.5% (

A microcomputer based instrument was developed for automatic spectrophotometry. Mercury(Ⅱ) can catalyze discoloration reaction of safranin T with potassium iodide.Based on this, a catalytic kinetics stopped FIA automatic method for determination of trace mercury was investigated. Beer′s law is obeyed in the range of 0 to 6.0 μg/mL with detection limit of 3.5×10 -7 g/mL for Hg(Ⅱ). Analysis frequency was 20 samples per hour. This method was applied to determination of mercury in water samples. The recovery is 95 6% and 98 5%,RSD is 5 1% and 4 5% ( n =9) for synthetic sample and waste water, respectively.