![Sample our Physical Sciences journals, sign in here to start your FREE access for 14 days]({"type":"image" , "src" : "/sda/110819/TOC-Subject-Sample-2021-Physical-Sciences.jpg"})
Abstract
Silver iodide is determined in soil and water samples after reduction by zinc, in acidic with acetic acid environment at 60°C, for 2 h. Iodide ions are subsequently determined by High Pressure Ion Chromatography using a low capacity, PRP-X100 Hamilton 150 × 4.1mm, 10μm, anion exchange column filled with spherical poly(styrene-divinylbenzene)trimethylammonium exchanger, with a mobile phase consisted of CH3OH-NaCl 0.1 M (55:45 v/v).
Identification of iodide ions was achieved by UV detection and quantitation was performed at 230 nm. Nitrate ions were used as internal standard at a concentration of 1.5 ng/μL. Limit of detection (S/N=3) was 0.8 ng for iodide ions. Recovery of iodide from silver salt was 95% with a reproducibility better than 6% RSD. Recovery of silver iodide from spiked soil matrices was 90%.
Solid phase extraction, using SAX Lichrolut Merck cartridges, revealed recoveries of iodide ions ranging from 86 - 108%. Iodides were eluted from sorbent using a mixture of 70-30% v/v 0.1M NaCl-CH3OH as eluent.
Statistical evaluation of presented method was examined performing intra-day (n=8) and inter-day (n=8) calibration studies and was found to be satisfactory with high accuracy and precision results.