银催化HDEA电化学发光法测定矿样中的痕量银

Determination of Trace Silver in Ores by the Electrochemiluminescence System of HDEA

在碱性介质中,痕量Ag(Ⅰ)对新试剂6-(2-羟基-4-二乙基氨苯偶氮)-2,3-二氢-1,4-酞嗪二酮(简称HDEA)的电化学发光具有显著的催化作用。基于此,提出了HDEA-KCI-KOH体系测定矿样中痕量Ag的新方法。方法的检测限为2.0×10^(-8)mol/L Ag,线性范围为5.0×10^(-8)—3.0×10^(-6)mol/L Ag。采用巯基棉富集分离,应用本法测定一些矿样中的Ag,结果良好。

The electrochemiluminescence of the new reagent 6-(2-hydroxy-4-diethyl-aminophenylazo) -2,3-dihydro-l,4-phthalazine-l,4-dione(HDEA) in an aqueous alkaline solution is catalyzed by trace silver (Ⅰ). A new highly sensitive method for determination of trace silver with HDEA-KC1-KOH system is suggested. The detection limit of the method is 2.0×10-8 mol/L Ag and linear range is from 5.0×10-8 to 3.0×l0-6 mol/L Ag. The method has been applied to the determination of Ag in ores after preconcentration Ag(Ⅰ) using sulf-hydrylated cotton fiber and the results were satisfactory.