An-Najah National University

An-Najah Blogs


  • Sunday, December 1, 2002
  • Atrazine Detection Using Reflectometric Interference Spectroscopy in Several Ground and Surface Water Samples in Palestine
  • Published at:مجلة جامعة الأزهر بغزة - سلسلة العلوم الطبيعية، العدد (5) ديسمبر 2002
  • Reflectometric interference spectroscopy (RIFS) was investigated for the detection of atrazine in several ground and surface water samples in Palestine. The basic effect is white light interference at thin transparent films. Chips were modified for covalent modofication of interference layers with atrazine-caproic acid. Binding of proteins at the surface increases the optical thickness of the film which is detected as a change in the reflectance spectra. A calibration curve was constructed and the results of analysis of all samples show the concentration of atrazine did not exceed 0.5ppb.
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  • Monday, January 1, 1996
  • A catalytic method for the determination of trace amounts of mercury uptaken by broad beams plants
  • Published at:MAIN GROUP METAL CHEMISTRY, Vol. 19, Issue. 2, (1996), 103-106
  • A new accurate, fast catalytic method for the determination of trace amounts of mercury uptaken by plants is proposed. The method is based on the catalytic effect of mercury(II) on the rate of ligand-exchange reaction between ferrozine and hexacyanoferrate(II) whereby a coloured violet complex is formed which absorbs at 562 nm. The method allows the determination of mercury(II) in the range 0.05-4.0 ppm. The effect of pH, hexacyanoferrate, ferrozine, temperature, time of reaction and tolerance limit of many ions have been reported. The method is applied to the determination of mercury(II) uptaken by broad beans plants irrigated with water containing different amounts of mercury(II).
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  • Thursday, June 1, 1995
  • Preferential solvation of Fe(phen)2(CN)2 in binary aqueous acetone and 2-methoxyethanol mixtures
  • Published at:Monatshefte für Chemie / Chemical Monthly, Volume 126, Numbers 6-7 / June, 1995
  • Preferential solvation ofbis-1,10-phenanthroline-bis-cyanoiron(II) was investigated in aqueous acetone and 2-methoxyethanol binary mixtures. The solvatochromic behaviour is discussed in terms of donor and acceptor numbers. The thermodynamic model ofFrankel was used to treat preferential solvation in the binary aqueous 2-methoxyethanol mixtures and reveals that preferential solvation by the organic solvent occurs. The preferential solvation constant at 298.15K was found to be equal to 3.30±0.039, and the free energy of preferential solvation amounts to 2.96kJ·mole–1.
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  • Tuesday, November 1, 1994
  • A Sensitive Catalytic Method for the Determination of Copper by Its Catalytic Effect on the Potassium Bromate Indigo Carmine Reaction
  • Published at:Instrumentation Science & Technology, Volume 22, Issue 4 (November 1994), 355 - 363
  • A method for catalytic determination of copper (II) is presented. The method is based on the catalytic effect of copper(II) on the rate of oxidation of indigo carmine by potassium bromate. The method is satisfactory for the determination of copper(II) in the range 1.2 to 38 ng/mL. Effect of acidity, indigo carmine, potassium bromate, temperature and tolerance limits of foreign ions are reported. The method was applied to the determination of copper in synthetic and in various milk samples.
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Bassem Farah Salem Shraydeh
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