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Four different fatty acids (C7, C10, C14, and C18) were studied to characterize their abilities as lead(II) ion carrier in PVC membrane electrodes. The electrode based on capric acid [CH 3 (CH 2 ) 8 COOH] shows good Nernestian response for Pb 2+ ions. The optimum composition of the membrane was 30wt.% poly(vinyl chloride), 60wt.% NPOE as plasticizer, 5wt.% ionophore,...
A simple, rapid and sensitive flow injection spectrophotometric method for determination of selenium (0.005–1.5 μg ml −1 ) is described. The method is based on the catalytic effect of Se(IV) on the reduction reaction of thionine (TN) with sulphide ion, monitored spectrophotometrically at 598 nm. The detection limit is 5 ng ml −1 the relative standard deviation for eight replicate measurements...
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