Pervaporation-flow injection with chemiluminescence detection for determination of iodide in multivitamin tablets.

摘要: Abstract This paper describes the use of a pervaporation (PV) technique in flow injection (FI) system for selective improvement iodide analysis. Iodide sample zone is oxidized to iodine, which permeates through hydrophobic membrane. Detection diffused iodine achieved using chemiluminescent (CL) emission at 425 nm that results from reaction between and luminol. The method was applied analysis some pharmaceutical products, such as nuclear emergency tablets multivitamin tablets. Ascorbic acid present samples interfered seriously with analysis, off-line treatment anion exchange resin employed successfully remove ascorbic before flushed column 0.4 M sodium nitrate followed by elution 2 M nitrate. detection limit (3S.D.) 0.5 mg l−1, reproducibility 5.2% R.S.D. 5 mg l−1. Sample throughput determined 30 injections h−1. There good agreement concentrations extracted four different methods, i.e., PV-FI, gas diffusion-flow injection, potentiometry ICP-MS. A comparison analytical features developed these previously reported chemiluminescence also described.