تفاصيل الوثيقة

نوع الوثيقة : مقال في مجلة دورية 
عنوان الوثيقة :
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
 
الموضوع : كيمياء 
لغة الوثيقة : الانجليزية 
المستخلص : 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. 
ردمد : 0910-6340 
اسم الدورية : Analytical Sciences 
المجلد : 27 
العدد : 7 
سنة النشر : 1432 هـ
2011 م 
نوع المقالة : مقالة علمية 
تاريخ الاضافة على الموقع : Sunday, February 12, 2012 

الباحثون

اسم الباحث (عربي)اسم الباحث (انجليزي)نوع الباحثالمرتبة العلميةالبريد الالكتروني
محمد سرور الشهاويEl-Shahawi, Mohammad Sباحثدكتوراهmalsaeed@kau.edu.sa
عبدالعزيز صالح باشماخBashammakh, Abdulaziz Salehباحثدكتوراهabashammakh@kau.edu.sa
M AbdelmageedAbdelmageed, M باحثدكتوراه 

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اسم الملفالنوعالوصف
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