Pre-concentration of aqueous hexavalent chromium using tributyltin chloride immobilised on C18 cartridges

Abstract

Disposable commercial CI8 mini-cartridges are treated with tributyltin chloride (TBTCI) and used for selective pre-concentration of Crvl from aqueous solutions. The accumulated Crvl -TBTCI adduct is eluted with 5 ml of methanol and measured using electrothermal atomic absorption spectrometry. Pre-concentration factors of 100-fold are readily achieved for 0.100 ng ml-1 samples of CrVl with an average recovery of 98 k 8%.

Preconcentration and Speciation of Chromium in Water Samples by Atomic Absorption Spectrometry after Cloud-Point Extraction

“…15,16 Compared with the recent developments in the preconcentration, speciation and determination of Cr(III) and Cr(VI), such as solid-phase extraction and cloud-point extraction, the proposed method is simple and sensitive. 10,[12][13][14][15][16][17]21,22 In the present work we developed a CPE procedure for the speciation of chromium.…”

“…For this purpose, various separation and preconcentration methods, such as liquid-liquid extraction, 2,3 coprecipitation, 4,5 ion exchange, 6-8 adsorption [9][10][11][12] and solid-phase extraction, 10,[13][14][15] have been developed. In recent years, several methods for the preconcentration and separation of Cr(III) and Cr(VI) have been developed by using a micelle-mediated methodology.…”

Solid-Phase Extraction on Alkyl-bonded Silica Gels in Inorganic Analysis

“…63,66,75,[107][108][109] Exractions are also performed with membrane disks containing C18-bonded silica (8-µm particles, 6-nm pore size) on polytetrafluoroethylene (PTFE) or glass fiber supports (J. T. Baker, Varian). The typical composition of the disks is 80 -90% w/w C18 or C8-bonded silica and 10 -20% support, the disk dimensions are 47 mm in diameter and 0.5 mm thick.…”

A novel method for fast enrichment and monitoring of hexavalent and trivalent chromium at the ppt level with modified silica MCM-41 and its determination by inductively coupled plasma optical emission spectrometry

“…For this purpose, various separation and pre-concentration methods such as liquid-liquid extraction 1,6 , coprecipitation 3,7 , ion exchange [8][9][10] and adsorption [11][12][13][14] have been developed. Sugiyama et al 6 determined trace elements including chromium in natural waters by ICP OES after preconcentration by dithiocarbamate extraction.…”