Fabrication of a lead all solid state sensor for ppb level monitoring of aqueous lead samples

A novel all-solid-state ion selective electrode (ass-ise) has been constructed for the determination of pb(ii) ions in complex aqueous media. the ass-ise is constructed of a layer of a conductive graphite-epoxy resin composite on a copper wire,further coated with a pb(ii) selective pvc membrane. the optimal pvc membrane is composed of 31% pvc,62% nitrobenzen (nb),2% of sodium tetraphenyl borate,and 5% of n,n՛-dimethylcyanodiaza-18-crown-6 as a selectophore (l). the studies proved the device to have a nernstian response (i.e. 29.4±0.3 mv per decade) in a concentration range from 1.0×10-8 mol l-1 to 1.0×10-3 mol l-1,with a lower detection limit of 4.0×10-9 mol l-1. the proposed ass-ise was also found to possess a good pb(ii)-selectivity as opposed to various interfering cations. the device was further practically tested in the analysis of lead content of some water samples with complex matrices. © 2016 by cee (center of excellence in electrochemistry).