Solvent extraction and chemiluminescence determination of gold in silver alloy with luminol in reverse micelles

Abstract

A new method, based on the direct combination of solvent extraction with luminol chemiluminescence (CL) In a reversed micellar system of cetyltrimethylammonlum chloride-water (buffered with sodium carbonate)-6:5 (v/v) chloroformcyclohexane, Is established for the determination of gold In aqueous solutions. The Interference behavior of 15 metals on the reference gold CL signals was evaluated. By dispersing an aqueous solution of the Individual Interferent alone and In admixture with the analyte, a comparative Inquiry on their CL behavior was also carried out In the reversed micellar medium. Separation of analyte from Interferents by extraction with trln-octylphosphlne oxide In chloroform resulted In reduced or no Interference. The present method was applied to the determination of gold In Industrial samples of silver-based alloy.This work was partially supported by a Grant-in-Aid for Scientific Research, No. 04453038, from the Ministry of Education, Science, and Culture, Japan, and one of the authors, Imdadullah, also thanks this Ministry for awarding a Scholarship. We thank the Analytical Center of Sumitomo Metal Mining Co., Ltd., Niihama, Japan, for providing us silver-based alloy samples.

Flow Chemiluminescence Determination of Antimony(III,V) Using a Rhodamine B-Cetyltrimethylammonium Chloride Reversed Micelle System Following Liquid-Liquid Extraction

“…When reversed micelles are incorporated into the CL detection system, several advantages, including sensitivity and improved selectivity, are achieved. [18][19][20][21][22][23][24][25][26][27]29 It is believed that the reversed micellar-mediated CL (RMM-CL) reactions occur at water-surfactant interfaces of the reverse micelles. 18,19,23 We have pointed out that the uptake of CL-active species or CL reagents by reversed micelles into their water pools is significant in the RMM-CL process.…”

“…We have developed new hybrid analytical methods based on the combination of extraction procedures with the RMM-CL detection system. 19,22,25,26 For the liquid-liquid extraction of Sb(V), an ion-pair formation between the protonated rhodamine B, RBH + , and the negatively charged Sb(V) chloro-complex, [SbCl6]…”

A sensitive immunosensor using colloidal gold as electrochemical label

“…Some instruments involved are expensive and require skillful personnel to operate. Many other methods, such as inductively coupled plasma mass spectrometry [9], chemiluminescence [10], electrochemical stripping technique [11,12] have also been reported to measure the amount of colloidal gold in immunoassay or DNA assay. All of these methods require dissolving the gold nanoparticles using bromine or other oxidants * Corresponding author.…”

Reversed Micellar-Mediated Luminol Chemiluminescence Reaction with Bis(acetylacetonato)oxovanadium(IV)

“…The area with the most applications of reversed micellar media in spectrometry may be that of chemiluminescence (CL) analysis [1][2][3][4][5] , where the significance of reverse micelles is attributed to their unique structure (shape/size) and composition; besides other advantages, enhanced sensitivity can be achieved when reverse micelles are incorporated in the CL analysis. Most of our analytical work in this area has concerned the use of reverse micelles to enhance the performance of the CL methods for analysis of metal complexes in organic media, mainly combined with solvent extraction techniques: [6][7][8][9] the extract can be mixed directly with a macroscopically homogeneous solution of reverse micelles containing a luminescent reagent like luminol. The reversed micellar luminescent solution is produced by dispersing an aqueous solution of luminol in the bulk non-polar organic media containing surfactant molecules.…”