Flow injection fluorimetric determination of chromium(VI) in electroplating baths by luminescence quenching of tris(2,2′-bipyridyl) ruthenium(II)
Hassan S.; Ayman Abdel-Shafi; Mohammed A.;
Abstract
A sensitive and selective luminescence quenching method is developed and used for manual and flow injection analysis (FIA) of chromium(VI) by reaction with [Ru(bpy)3]2+. The emission peak of ruthenium(II) at 595 nm is linearly decreased as a function of Cr(VI) concentration. This permits determination of chromium(VI) ion over the concentration range 0.1-20 μg ml-1with a detection limit of 33 ng ml-1. The quenching process is due to an electron transfer from the luminescent [Ru(bpy)3]2+complex ion to Cr(VI) resulting in the formation of the non-luminescent [Ru(bpy)3]3+complex ion. Selectivity for Cr(VI) over many anions and transition, alkali and alkaline earth metal cations is demonstrated. High concentration levels of sulphate, chloride, borate, acetate, phosphate, nitrate, cyanide, Pb2+, Zn2+, Hg2+, Cu2+, Cd2+, Ni2+and Mn2+ions are tolerated. The effects of solution pH and [Ru(bpy)3]2+reagent concentration are examined and the reaction conditions are optimized. Validation of the method according to the quality assurance standards show suitability of the proposed method for use in the quality control assessment of Cr(VI) in complex matrices without prior treatment. The method is successfully applied to determine chromium(VI) in electroplating baths using flow injection analysis. Results with a mean standard deviation of ±0.6% are obtained which compare fairly well with data obtained using atomic absorption spectrometry. © 2005 Elsevier B.V. All rights reserved.
Other data
Title | Flow injection fluorimetric determination of chromium(VI) in electroplating baths by luminescence quenching of tris(2,2′-bipyridyl) ruthenium(II) | Authors | Hassan S. ; Ayman Abdel-Shafi ; Mohammed A. | Issue Date | 15-Oct-2005 | Journal | Talanta | DOI | 4 https://api.elsevier.com/content/abstract/scopus_id/24344460926 696 67 10.1016/j.talanta.2005.03.019 |
Scopus ID | 2-s2.0-24344460926 |
Recommend this item
Similar Items from Core Recommender Database
Items in Ain Shams Scholar are protected by copyright, with all rights reserved, unless otherwise indicated.