非平衡流动注射分光光度法在线测定痕量铅的研究

Non-equilibrium Flow Injection Spectrophotometry for Pb^(2+) On-line Determination

采用流动注射分析技术，研究了在碱性介质中铅与ｍｅｓｏ－四－（４－三甲钱基苯）卟琳高灵敏的显色反应，用自制的微机化流动注射分析仪准确控制反应时间，利用非平衡法原理，优化了实验条件，建立了在线测定痕量铅的新方法。线性范围为０．００～２．００ ｍｇ／Ｌ，分析速度每小时测定１２０次。方法适用于直接测定煤矿井水、鱼塘水、电场废水和自来水中的铅，所得的结果令人满意。

The colour reaction of Pb2+ with meso -tetrakis -(4- trimethylammoniumphenyl ) porphyrin in alkaline medium was studied. The experimental conditions were optimized by using self- made micro- computerized flow injection spectrophotometric analyzer, and a new analytical method for the on -line determination of Pb2+ based on non - equilibrium principle was established. The linear range of the method is 0.00-2.00 mg/L for Pb2+, and its analytical rate is 120/h. It is suitable for the determi- nation of trace lead in mine water, fishpond water, power plant waste water and well water with satis- factory results.