F. Abu-Shammala's research while affiliated with Islamic University of Gaza and other places
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Publications (8)
A new solid-phase microextraction (SPME) procedure extracts aromatic compounds in water at part-per-billion concenrations from aqueous samples using a small disk of poly (dimethyl siloxane) (PDMS) and ultraviolet absorption spectroscopy. The reversed-phase disk (PDMS) removes nonpolar aromatic compounds from contaminated water at equilibrium time m...
The sites of accumulation of manganese in cells of the unicellular chlorophyte algae Chlamydomonas and Chlorella, and the blue-green alga Anabaena, have been determined by energy-dispersive X-ray microanalysis of freeze-dried cryosections in a scanning transmission electron microsocpe. Following exposure of the cells to a solution containing 200 pp...
An apparently simple and novel technique was developed to aid detection of the total fuel aromatics in natural water. The method depends upon preconcentration of the aromatic compound into poly (dimethyl siloxane) disk and the use of ultraviolet absorption spectroscopy. The equilibrium times for the fuels studied, unleaded gasoline, kerosene, and n...
The effect of the addition of surfactants (50 nM, i.e., above cmc) as organic modifiers into a solution containing 50% acetonitrile (+ 50% water) at neutral pH (7.0) for separating 17 organic compounds has been studied experimentally. The results have shown that the capacity factors, k′, of the organic compounds are sharply dependent on the types a...
A new chromatographic method is presented that successfully determines nirite in natural water at subnanomolar concentration. The procedure was based on converting the nitrite to a derivative using 2,4-dinitro phenyl hydrazine followed by separation using High-Performance Liquid Chromatography (HPLC). The method is simple, rapid, and requires minim...
Dithizone (diphenyl thiocarbazone, H2Dz) has been solubilized in a mixed micellar solution of nonionic (poly (oxyethylene) (23) dodecanol) (Brij 35) and anionic (sodium dodecylsulfate) (SDS) surfactants. Increasing the surfactants concentration above the critical micelle concentration produces more micelles that provide local nonpolar microenvironm...
A solid phase extraction (SPE) system has been modified with cationic surfactants and evaluated for extraction and preconcentration of trace phenolic compounds contaminants in water at low ppb concentrations. Cationic surfactants such as cetyl trimethyl ammonium bromide (CTAB) has been steadily adsorbed on the surface of C-18 bonded silica, and the...
Includes bibliographical references. Thesis (Ph. D.)--University of Queensland, 1996.
Citations
... No other metals were detected (data not shown). These structures corresponded to the polyphosphate bodies which have been reported in some other algae and cyanobacteria (Cembella et al., 1984; Tang et al., 1995; Abu-Shammala, 1999; Rangsayatorn et al., 2002). Interestingly, growth in low phosphate had little effect on the number or size of these bodies (Fig. 4). ...
... The LODs ranged from 0.016 to 0.075 µg/L based on a signal-to-noise (S/N) ratio of 3. The LOQs ranged from 0.053 to 0.250 µg/L based on S/N = 10. In previous studies, conventional SPE, SPME or in-syringe DSPE were usually applied as the preconcentration step in the analysis of US EPA-listed phenols [24][25][26][27][28][29][30][31]. As Table 3 shows, the LODs achieved in this work were lower than those previously reported using Amberlite XAD-2 [27,28], multi-walled carbon nanotubes [29], olive wood [26], 3D honeycomb-layered double hydroxides [32] or normal GA [33] as sorbents. ...
