金属与磷有机化合物中硫的微量分析──离子选择性电极电位滴定法

Micro-analysis of sulfur in metals and Phosphorus-containing organic compounds-ISE-potentiometric titration

封管钾熔融分解有机硫样品。以０．０１ＮＰｂ（ＮＯ３）２溶液直接电位滴定Ｓ＝，银离子选择性电极作指示电极，对照饱和甘汞电极（硝酸钾—琼脂盐桥）测量电位。方法的终点有明显的突跃，化合物中含磷、砷、氟、氮、氯、溴、碘、硼、硅、钾、钠、钙、镁、钡、铬、铝、铁、锆与铂不干扰硫的测定。

Organic samples containing S were decompounded by sealing tube fusion with K and the resulting S￣(2-) was potentiometric titrated by 0.01N pb(NO3)2 solution directly,with a silver ion-selective electrode was used as a indicator electrode,potentials measured vs.SEC (KNO_3-agar salt bridge).The method has a sharp end point.The presen -ce of P,As,F,N,Cl,Br,I,B,Si,K,Na,Ca,Mg, Ba,Al,Fe,Cr,Zr,ahd Pt do not interfered with the sulfur determination.