Character Of Sol-Gel-Alizarin Red S Modified Electrode And Determination Of Alumium And Molybdenum

The chemically modified electrode which immobilized Alizarin Red S (ARS) on glassy canbon(GC) electrode using the Sol-Gel film and its application for the determination of metal ions was investigated. The influence factors on properties of sol-gel film, such as proportion of dilution, additive and pretreatment of the electrode, were studied and optimized. The electrochemical behavior of ARS-sol-gel modified electrode was similar to ARS in solution. The dynamics parameters of ARS on GC electrode were compared with that in solution. This ARS-sol-gel modified electrode was applied for determination of aluminum. The linear range of aluminum concentration was from 1.44 l0-7mol/L to 1.44 l0-6mol/L.A new high sensitive spectrophotometric determination of trace molybdenum was investigated. Copper(â…¡) ions greatly enhanced the sensitivity of the determination of molybdenum, which based on the color charge transfer complex of molybdotungstophosphate-3,3',5,5' -tetramethylbenzidine, in the presence of poly vinyl alcohol. Molar absorption coefficient ( ) was 4.92 105 1 mol-1 cm-1 . The improved method maintained the features of simplicity, rapidity and selectivity, especially eliminating the interference from tungsten.