ANODIC STRIPPING VOLTAMMETRIC DETERMINATION OF SILVER(I) IN WATER USING A 4-TERT-BUTYL-l-(ETHOXYCARBONYLMETHOXY) THIACALIX[4]ARENE MODIFIED GLASSY CARBON ELECTRODE

摘要

A glassy carbon electrode coated with film of 4-tert-butyl-l-(ethoxycarbonylmethoxy) thiacalix[41arene is designed for the determination of trace amounts of Ag~+. Compared with bare glassy carbon electrode, the modified electrode can greatly improve the measuring sensitivity for Ag~+. Under the optimum experimental conditions, the modified electrode in B-R buffer solution (pH 4.5) shows a hnear voltammetric response in the range of 5.0 x 10~(-8)—3.0 x 10~(-6) M with detection limit 1.0 x 10~(-8) Mfor Ag~+. The high sensitivity, selectivity, and stability of modified electrode also demonstrate its practical application for a simple, rapid and economical determination of Ag~+ in water samples.