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Papers by Sami Sheikheldin

Research paper thumbnail of Chemical Analysis of Some Penicillin And Cephalosporin Drugs

Research paper thumbnail of Effect of Water Quality Parameters on the Migration of Vinyl Chloride Monomer from Unplasticized PVC Pipes

Water Air and Soil Pollution, 2000

The migration of vinyl chloride monomer (VCM) from unplasticizedpolyvinyl chloride (uPVC) pipes w... more The migration of vinyl chloride monomer (VCM) from unplasticizedpolyvinyl chloride (uPVC) pipes was investigated using locallymanufactured pipes. Specimens of 33 cm long were used throughoutthe research. The investigation was carried out under differentconditions of water temperature, pH and total dissolved solidsconcentration and at different durations of exposure. The VCMconcentration in the water was evaluated using the gaschromotography (GC)/head-space technique. A

Research paper thumbnail of Effect of solar radiation on the migration of vinyl chloride monomer from unplasticized PVC pipes

Research paper thumbnail of Determination of phenol in water by pervaporation–flow injection analysis

Analytica Chimica Acta, 2000

... This method cannot detect nitro-and para-substituted phenols since they do not react with 4-A... more ... This method cannot detect nitro-and para-substituted phenols since they do not react with 4-AAP. This drawback was overcome by a flow injection (FI) based method with electrochemical detection developed by Christophersen and Cardwell [11]. ...

Research paper thumbnail of Pervaporation-flow injection analysis of phenol after on-line derivatisation to phenyl acetate

Analytica Chimica Acta, 2003

A reverse pervaporation-flow injection (rPFI) method coupled with on-line derivatisation was deve... more A reverse pervaporation-flow injection (rPFI) method coupled with on-line derivatisation was developed for the determination of trace phenol in aqueous samples. On-line rPFI derivatisation was performed by direct injection of acetic anhydride into a donor stream of standard or sample phenol solution, which had been merged upstream with an alkaline concentrated sodium chloride stream. The reaction mixture was passed through

Research paper thumbnail of Migration of vinyl chloride monomer (VCM) and additives into PVC bottled drinking water

Journal of Environmental Science and Health . Part A: Environmental Science and Engineering and Toxicology, 1997

Research paper thumbnail of Concentration of metals of health significance in commonly consumed shrimps in the eastern province of Saudi Arabia

Journal of Environmental Science and Health . Part A: Environmental Science and Engineering and Toxicology, 1995

... Key word:Arsenic, metal contamination, shrimp types, Arabian Gulf shrimp Muhammad Sadiq, TH Z... more ... Key word:Arsenic, metal contamination, shrimp types, Arabian Gulf shrimp Muhammad Sadiq, TH Zaidi, and S. Sheikheldin Water Resources and Environment Division The Research Institute King Fahd University of Petroleum and Minerals Dhahran 31261, Saudi Arabia ...

Research paper thumbnail of Development of a simple monitoring technique for oil pollution in sediment

Journal of Environmental Science and Health, Part A, 1999

... Key Words: Oil hydrocarbons, contamination, sediment, determination, HPLC Aarif H. El-Mubarak... more ... Key Words: Oil hydrocarbons, contamination, sediment, determination, HPLC Aarif H. El-Mubarak*, Sami Y. Sheikheldin, Nabil M. Fayad and Naseem Khaja ... A correlation coefficient r2 of 0.996 over a wide range of up to 12 mg/ml and a detection limit of 80 Ag/ml. ...

Research paper thumbnail of Determination of Henry's law constants of phenols by pervaporation-flow injection analysis

Environmental …, 2001

A novel dynamic nonequilibrium technique for the determination of Henry's law constant (HLC) of p... more A novel dynamic nonequilibrium technique for the determination of Henry's law constant (HLC) of phenols based on pervaporation-flow injection (PFI) is described. A linear relationship between HLC and the amount of phenol measured by a detector in the acceptor line of a PFI system was demonstrated. This relationship was constructed using five frequently encountered phenols (phenol, 2,4dimethylphenol, 2,4-dichlorophenol, 2-chlorophenol, and 2,3dimethylphenol) and used for the determination of the HLC of three other phenols (2,4,6-trichlorophenol, 2-methylphenol, and 3-methylphenol). The HLC of all eight phenols were also determined by the single equilibrium static technique (SEST). Fairly good agreement was observed between both techniques regarding the HLC of 2,4,6trichlorophenol, 2-methylphenol, and 3-methylphenol. On the basis of the results obtained, it was concluded that the PFI technique offers considerable advantages over SEST in terms of precision, speed, labor intensity, and possibilities for automation.

Research paper thumbnail of Chemical Analysis of Some Penicillin And Cephalosporin Drugs

Research paper thumbnail of Effect of Water Quality Parameters on the Migration of Vinyl Chloride Monomer from Unplasticized PVC Pipes

Water Air and Soil Pollution, 2000

The migration of vinyl chloride monomer (VCM) from unplasticizedpolyvinyl chloride (uPVC) pipes w... more The migration of vinyl chloride monomer (VCM) from unplasticizedpolyvinyl chloride (uPVC) pipes was investigated using locallymanufactured pipes. Specimens of 33 cm long were used throughoutthe research. The investigation was carried out under differentconditions of water temperature, pH and total dissolved solidsconcentration and at different durations of exposure. The VCMconcentration in the water was evaluated using the gaschromotography (GC)/head-space technique. A

Research paper thumbnail of Effect of solar radiation on the migration of vinyl chloride monomer from unplasticized PVC pipes

Research paper thumbnail of Determination of phenol in water by pervaporation–flow injection analysis

Analytica Chimica Acta, 2000

... This method cannot detect nitro-and para-substituted phenols since they do not react with 4-A... more ... This method cannot detect nitro-and para-substituted phenols since they do not react with 4-AAP. This drawback was overcome by a flow injection (FI) based method with electrochemical detection developed by Christophersen and Cardwell [11]. ...

Research paper thumbnail of Pervaporation-flow injection analysis of phenol after on-line derivatisation to phenyl acetate

Analytica Chimica Acta, 2003

A reverse pervaporation-flow injection (rPFI) method coupled with on-line derivatisation was deve... more A reverse pervaporation-flow injection (rPFI) method coupled with on-line derivatisation was developed for the determination of trace phenol in aqueous samples. On-line rPFI derivatisation was performed by direct injection of acetic anhydride into a donor stream of standard or sample phenol solution, which had been merged upstream with an alkaline concentrated sodium chloride stream. The reaction mixture was passed through

Research paper thumbnail of Migration of vinyl chloride monomer (VCM) and additives into PVC bottled drinking water

Journal of Environmental Science and Health . Part A: Environmental Science and Engineering and Toxicology, 1997

Research paper thumbnail of Concentration of metals of health significance in commonly consumed shrimps in the eastern province of Saudi Arabia

Journal of Environmental Science and Health . Part A: Environmental Science and Engineering and Toxicology, 1995

... Key word:Arsenic, metal contamination, shrimp types, Arabian Gulf shrimp Muhammad Sadiq, TH Z... more ... Key word:Arsenic, metal contamination, shrimp types, Arabian Gulf shrimp Muhammad Sadiq, TH Zaidi, and S. Sheikheldin Water Resources and Environment Division The Research Institute King Fahd University of Petroleum and Minerals Dhahran 31261, Saudi Arabia ...

Research paper thumbnail of Development of a simple monitoring technique for oil pollution in sediment

Journal of Environmental Science and Health, Part A, 1999

... Key Words: Oil hydrocarbons, contamination, sediment, determination, HPLC Aarif H. El-Mubarak... more ... Key Words: Oil hydrocarbons, contamination, sediment, determination, HPLC Aarif H. El-Mubarak*, Sami Y. Sheikheldin, Nabil M. Fayad and Naseem Khaja ... A correlation coefficient r2 of 0.996 over a wide range of up to 12 mg/ml and a detection limit of 80 Ag/ml. ...

Research paper thumbnail of Determination of Henry's law constants of phenols by pervaporation-flow injection analysis

Environmental …, 2001

A novel dynamic nonequilibrium technique for the determination of Henry's law constant (HLC) of p... more A novel dynamic nonequilibrium technique for the determination of Henry's law constant (HLC) of phenols based on pervaporation-flow injection (PFI) is described. A linear relationship between HLC and the amount of phenol measured by a detector in the acceptor line of a PFI system was demonstrated. This relationship was constructed using five frequently encountered phenols (phenol, 2,4dimethylphenol, 2,4-dichlorophenol, 2-chlorophenol, and 2,3dimethylphenol) and used for the determination of the HLC of three other phenols (2,4,6-trichlorophenol, 2-methylphenol, and 3-methylphenol). The HLC of all eight phenols were also determined by the single equilibrium static technique (SEST). Fairly good agreement was observed between both techniques regarding the HLC of 2,4,6trichlorophenol, 2-methylphenol, and 3-methylphenol. On the basis of the results obtained, it was concluded that the PFI technique offers considerable advantages over SEST in terms of precision, speed, labor intensity, and possibilities for automation.