摘要
汞膜电极以饱和Na_(2)SO_(3)液和浓NH_(4)OH液浸泡后,放置4—6天灵敏度可保持不变,稳定性良好。大面积银基物理涂汞电极问世,解决了化学镀层的复杂性;使其能直接用于海水重金属离子测定,比经典滴汞电极提高灵敏度2—3个量级。电极防吸附膜的研究开辟了固体电极表面防吸附的尝试,本文使用饱和Na_(2)SO_(3)液与浓NH_(4)OH液浸泡电极,使电极放置4—6天可保持灵敏度不变,延长了寿命,方法具有实用价值。
In this paper,a new method of protecting the sensitivity and stability of physically coated mercury film electrode is proposed.The method is to keep the physically coated mercury film electrode in saturated Na_(2)SO_(3)solution or concentrated NH_(4)OH solution in a close condition.The electrode soaked in saturated Na_(2)SO_(3)solution was used to determine Zn(Ⅱ)and in concentrated NH_(4)OH solution to determine Zn(Ⅱ),Cd(Ⅱ),Pb(Ⅱ)simultaneously(Cu(Ⅱ)was not detected).The experiment results show that high sensitivity and constant stability of physically coated mercury film electrode have been maintained for 4—6 days with this method,thus simplifying the analytioal procedure,improving the precision and prolonging the life of electrode.This method can well be applied to voltammaetry analysis,especially in field investigation.
作者
包万友
顾宏堪
刘明星
Bao Wanyou;Gu Hongkan;Liu Mingxing(Institute of Oceanology,Academia Sinica,Qingdao)
出处
《海洋与湖沼》
1986年第5期449-452,共4页
Oceanologia Et Limnologia Sinica
