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 TypeDr GradeEmail
محمد سرور الشهاويEl-Shahawi, Mohammad SResearcherDoctoratemalsaeed@kau.edu.sa
عبدالعزيز صالح باشماخBashammakh, Abdulaziz SalehResearcherDoctorateabashammakh@kau.edu.sa
M AbdelmageedAbdelmageed, M ResearcherDoctorate 

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