流动注射—褪色光度法测定铁(Ⅲ)研究

Research on Flow Injection Fading Spectrophotometric Determination of Iron(Ⅲ)

基于铁（Ⅲ）可氧化酸性品红溶液而使之褪色,将该方法与流动注射自动进样技术联用,建立了流动注射—褪色光度法测定微量铁（Ⅲ）的新方法.在最优的实验条件下,该方法线性范围为0.05~1.5 mg/L,检出限（3σ）为0.01 mg/L,相对标准偏差（RSD）为2.60%（Fe3＋0.75 mg/L,n=11）.该方法应用于自来水、河水、井水中铁（Ⅲ）含量的测定,加标回收率在96.8%~101.2%之间,具有较好的重现性和准确性.

On the basis of the fading reaction of acid fuchsin with iron（Ⅲ）,a fading spectrophotometric method combined with flow injection technology was developed for the determination of iron（Ⅲ）.Under optimum analytical conditions,the concentration of iron（Ⅲ） is linear with absorbency in the range of 0.05～1.5 mg/L and the detection limit is 0.01 mg/L.The relative standard deviation（RSD） is 2.60% for 0.75 mg/L iron（Ⅲ）（n=11）.The method has been successfully applied to the determination of iron（Ⅲ） in tap water,river water and well water,and the recoveries are between 96.8% and 101.2%,which has better reproducible and accurate effects.