锰(Ⅱ)-PAR配合物极谱吸附波的研究及应用

Studies on Polarographic Adsorption Wave of Mn(Ⅱ)-PAR Complex and Its Analytical Application

4-(2-吡啶偶氮)-间苯二酚(PAR)能与锰(Ⅱ)离子形成配合比为2:1的配合物,可用于光度法测定锰,但其电化学行为及其分析应用未见报道.本文研究了Mn(Ⅱ)-PAR配合物的极谱行为,发现此配合物在碱性介质(pH=12.5)中,在滴汞电极上于—0.94 V(vs SCE,下同)产生一良好的灵敏吸附还原波,据此建立了测定痕量锰的极谱吸附波分析法.

In Na2B4O7(0. 08 mol/L)-NaOH medium at pH 12. 5, the complex compound of Mn ( Ⅱ )-4-(2-pyridyazo)-resorcinol (PAR) gives a sensitive polarographic adsorption wave with relation to the concentration of Mn( Ⅱ ) at -0. 94 V(vs. SCE) in single-sweep oscillopolarograph, on the basis of which a new sensitive method for the determination of manganese by this polarographic adsorptive wave is established. There is a good linear relationship between the peak height of this wave and the concentration of Mn( Ⅱ ) in the range of 4. 0×10-8-5. 2×10-6 mol/L and the detection limit is 1. 0×10-8 mol Mn( Ⅱ )/L.