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Document Details
Document Type
:
Article In Journal
Document Title
:
Chemical speciation of chromium(III) and (VI) using phosphonium cation impregnated polyurethane foams prior to their spectrometric determination
Chemical speciation of chromium(III) and (VI) using phosphonium cation impregnated polyurethane foams prior to their spectrometric determination
Subject
:
Chemistry
Document Language
:
English
Abstract
:
Fast and selective sorptions of Cr(VI) species from aqueous media onto tetraphenylphosphonium bromide (TPP +·Br̄) physically immobilized polyurethane foams (PUFs) sorbent were achieved. Based on the Scatchard model of binding sites of the PUFs and Langmuir and Dubinin-Radushkevich (D-R) adsorption models of Cr(VI) retention onto TPP +·Br̄ immobilized PUFs, a dual retention mechanism involving absorption related to "weak-base anion ion exchange" and an added component for "surface adsorption" was proposed. Thus, the TPP +·Br̄ loaded PUFs were successfully packed in column mode for preconcentration of trace and ultra trace concentrations of Cr(VI) as halochromates [CrO 3C]̄ aq from aqueous HCl media. The retained [CrO 3C]̄ aq species were recovered with NaOH (1.0 mol L -1) and analyzed by flame atomic absorption spectrometry. Cr(III) species after oxidation to Cr(VI) with H 2O 2 in aqueous KOH (1.0 mol L -1) were also retained and could be recovered by the proposed method. The limits of detection (LOD) and quantification (LOQ) of Cr(VI) were 0.04 and 0.13 μg L -1, respectively. The chemical speciation of Cr(III, VI) species in various water samples at trace and ultra trace levels were carried out by TPP +·Br̄ loaded PUFs packed column. The enhancement factor and sensitivity factor of [CrO 3C]̄ aq sorption were 80.0 and 30.0, respectively.
ISSN
:
0910-6340
Journal Name
:
Analytical Sciences
Volume
:
27
Issue Number
:
7
Publishing Year
:
1432 AH
2011 AD
Article Type
:
Article
Added Date
:
Sunday, February 12, 2012
Researchers
Researcher Name (Arabic)
Researcher Name (English)
Researcher Type
Dr Grade
Email
محمد سرور الشهاوي
El-Shahawi, Mohammad S
Researcher
Doctorate
malsaeed@kau.edu.sa
عبدالعزيز صالح باشماخ
Bashammakh, Abdulaziz Saleh
Researcher
Doctorate
abashammakh@kau.edu.sa
M Abdelmageed
Abdelmageed, M
Researcher
Doctorate
Files
File Name
Type
Description
32261.pdf
pdf
PDF
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