Studies with an inorganic ion-exchange membrane exhibiting selectivity for Pb(II) ions.
A solid membrane electrode made with titanium arsenate as membrane material and "Araldite" as binder has been used to measure the activity of lead in the concentration range from 0.1 M to 5 x 10(-6)M. The electrode is unaffected by many cations, nitrate and acetate. The response time is 40-60 sec over the whole concentration range (in a static system) and the electrode has a working life of at least four months. The electrode can work in the pH range 2-5 and is tolerant of ethanol up to a content of 30% v v . It has been successfully used for end-point indication in potentiometric titration of lead. A membrane treated with cationic surfactant exhibits better selectivity.
Srivastava
S K
SK
Department of Chemistry, University of Roorkee, Roorkee-247667, India.
Kumar
S
S
Jain
C K
CK
Kumar
S
S