Flow injection determination of iodide ion in a photographic developing solution using iodide ion-selective electrode detector.
A potentiometric flow injection determination method for iodide ion in a photographic developing solution was proposed by utilizing a flow-through type iodide ion-selective electrode detector. The sensing membrane of the electrode was Ag(2)S-AgI membrane. The response of the electrode detector as a peak-shape signal was obtained for injected iodide ion in a photographic developing solution. A linear relationship in the subnernstian zone was found to exist between peak height and the concentration of the iodide ion in a photographic developing solution in a concentration range from 0 to 6.0x10(-5) mol l(-1). The relative standard deviation for ten injections of 2x10(-5) mol l(-1) iodide ion in a photographic developing solution was 0.96% and the sampling rate was approximately 12-13 samples h(-1). The iodide ion could be determined under coexisting of an organic reducing reagent and inorganic electrolytes of high concentration in a photographic developing solution sample solution by the present method.
Flow-through tubular ion-selective electrodes responsive to anionic surfactants for flow-injection analysis
Abstract A flow-injection system based on potentiometric detection and designed for the monitoring of anionic surfactant content of printing plates washing solutions is described. Two new PVC membrane ion-selective electrodes, constructed with an all-solid-state tubular flow-through design, are used. The sample, with high ionic strength and extremely alkaline pH, is conditioned in a two-channel flow-injection system, allowing for surfactant determination in the 1 × 10 −4 to 1 × 10 −3 M range, with NaOH contents up to 0.3 M.
Flow injection analysis with tubular membrane ion-selective electrodes in the presence of anionic surfactants
Calcium ion-selective electrodes based on calcium bis{di[4-(1,1,3,3-tetramethylbutyl)phenyl]phosphate} with trioctyl phosphate in poly(vinyl chloride) have improved resistance to interference by anionic surfactants when used in flow injection analysis. Tubular membrane electrodes have been used in flow injection analysis for determining calcium ion levels in selected potable and raw water and the data agree well with determinations by atomic-absorption spectroscopy and EDTA titration.Tubular membrane electrodes with improved membrane sensor have the potential for the determination of free calcium ions for a concentration as low as 10–4M in the presence of a moderate background concentration of detergent, but this is poor compared with the concentration of ⩽10–5M, which can be attained by the conventional type electrode with the same membrane system under static conditions.