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- 저자 : H.M. Al-Saidi (검색결과 2 건)
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M.S. El-Shahawi,A.A. Al-Sibaai,A.S. Bashammakh,H. Alwael,H.M. Al-Saidi 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.28 No.-
The sorption profile of trace concentrations of bismuth(III) species from aqueous KI–H2SO4 media ontothe ion pairing procaine hydrochloride (PQ+.Cl ) based polyurethane foam (PUFs) was studied. A dual–mode of bismuth(III) sorption as a ternary complex ion associate [PQ+.BiI4] involving absorption due toa ‘‘weak base anion exchanger’’ and an added component for ‘‘surface adsorption’’ seems the proposedmechanism for bismuth(III) retention. The capacity of bismuth(III) sorption was found equal40.05 1.10 mg g 1. Complete separation of spiked bismuth(III) at various concentrations (5–15 mg mL 1)1) from water onto the proposed sorbent packed columns at 5 mL min 1 flow rate was successfully achieved. The retained bismuth(III) species were recovered quantitatively from the sorbent packed columns(98.4 2.4%, n = 5) with HNO3 (1.0 mol L 1). Bismuth(V) after reduction to Bi(III) was also preconcentrated,recovered from the sorbent packed column and subsequently analyzed by inductively coupled plasma–optical emission spectrometry (ICP–OES). The height equivalent to the theoretical plates (HETP), number ofplates (N), critical and breakthrough capacities of sorbent packed column towards bismuth(III) retentionwere evaluated. Based on these results, a simple and sensitive PQ+.Cl –PUF packed column was developed fordetermination and speciation of trace concentrations of bismuth(III & V) species in water by ICP–OES. Thelimits of detection (LOD) and quantification (LOQ) of Bi(III) were found 0.09 and 0.30 mg L 1, respectively. The relative standard deviation (RSD) for 5 replicates of 50 ng L 1 Bi at 2.0 mL min 1 flow was 3.7%. Theproposed column was validated and applied for the preconcentration, separation and subsequentdetermination of analyte in Environmental water reference material (TMDW) and water samples. Theresults were found to be in good agreement with the CRM at the 95% confidence level.
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M.S. El-Shahawi,A. Hamza,A.A. Al-Sibaai,A.S. Bashammakh,H.M. Al-Saidi 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.2
A simple new micelle mediated preconcentration method was developed for analysis of sunset yellow (SY) prior to its spectrophotometric determination. The method was based upon cloud point extraction of the ion associate of SY and trioctylamine (TOA) in HCl–Triton X-100. In the surfactant phase the SY species react with TOA yielding hydrophobic ion associate of SY-+TOA+. The distribution coefficient of SY between surfactant-rich phase and aqueous phase was approximately 104. Validation was tested by comparing the results with standard HPLC. Isotherm and thermodynamic parameters, chemical equilibrium, extraction constants and stiochiometry of the associate were assigned.
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