聚四氟乙烯毛细管在线富集分离痕量钌(Ⅲ)及荧光测定

Determination of Trace Ruthenium by On-line Concentration and Spectrofluorimetric Method Using a Teflon Capillary Tube

利用碱性条件下聚四氟乙烯毛细管（PTFE tube）对钌-邻菲罗啉具有富集作用,建立了单道流动注射在线富集分离及检测痕量钌的荧光分析法.本方法考察了毛细管壁、流速、pH值、温度及掩蔽剂EDTA、干扰离子等因素对富集效果的影响.当浓缩液pH值为11.8,邻菲罗啉浓度为1×10 ^-4 mol/L,浓缩和洗脱速度为3.8 mL/min及EDTA的浓度为2×10^-2 mol/L时,获得最佳结果.在优化的实验条件下,该方法在0～50 ng/L范围内呈良好的线性关系,检出限为0.8 ng/L（S/N=3）; RSD=2.1%（n=3）.

A single channel flow injection method for the spectrofluorimetric determination of Ru（Ⅲ） at trace level was developed. The method is based on the adsorptive power of polytetrafluoroehtylene （PTFE） tube for Ru（Ⅲ） o-phenanthroline complex and its relative thermostability and fluorescence character. Some factors such as inner wall of tube, flow velocity, pH, temperature, and interference metal ions were investigated. At pH 11.8, an amount of 1 × 10^-4 mol/L o-phen, 2 × 10^-2 mol/L of EDTA concentration, at a flow velocity of 3.8 mL/min and treatment of heating tube, it showed good results. Under the optimum experimental conditions, the linear range and detection of the proposed method are 0 - 50 ng/L and 0. 8 ng/L （ S/N = 3 ）, RSD = 2.1%.