New Pb(II)-selective membrane electrode based on a new Schiff base complex
摘要:
Schiff base complex [Co(L)(2)](ClO4)center dot(C3H6O)center dot(H2O) (1) was synthesized and structurally determined [L=2-((E)-(3-aminopyridin-4-ylimino)methyl)-phenol and C3H6O=acetone]. With 1 as the ionophore a new Pb(II)-selective membrane electrode was exploited. The electrode exhibits Nernstian response to Pb(II) over a wide concentration range (1.0 x 10(-5) to 1.0 x 10(-2) M), with a slope of 23.9 mV/dec, a fast response time (t(95%)=10 s), and a lower detection limit of 4.6 x 10(-6) M. It has acceptable selectivity for Pb(II) over a wide variety of other metal ions in a wide pH range of 4-13, showing practical detection for Pb(II). (C) 2011 Elsevier B.V. All rights reserved.