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Unformatted text preview: etector were investigated. Under the optimized conditions, phenolic acids were successfully separated in about 15 min. Separations were carried out on a bare fused -silica capillary (50 µm i.d x 40 cm length) involving 25 mM sodium borate (pH 9.15) and 5 % methanol as a CZE background electrolyte in the normal polarity mode, the voltage of 30 kV, temperature of 25 °C and electropherograms were recorded at 200 nm. The relationship between the CZE migration times and the molecular weight of the phenolic acids, and the amount of their hydroxyl groups and polarity were explored. Differe nt honey samples including the Tualang honey which had been noted for its unique properties was tested. ANA-P15 SPECTROPHOTOMETRIC DETERMINATION OF MERCURY ION AFTER LIQUID -LIQUID EXTRACTION WITH o-TOLUIDINE BLUE H. Parham, H.Noorizadeh and F. Nekouei Department of Chemistry, Faculty of Science, Azad Islamic University of Gachsaran, Iran E-mail: [email protected] A simple and highly sensitive extraction-spectrophotometric determination of mercury was described. -2 The ion-associate formed between the HgI4 and o-Toluidine Blue is extracted with dichloromethane at pH 6.The absorption maximum of the extracted species occurs at 593 nm, the molar absorptivity being -1 -1 -1 1.42E5 L mol cm . The calibration curve was linear in the concentration range of 0.1 - 2.5 µg mL of 2+ -1 Hg with a correlation coefficient of 0.9995. The limit of detection (LOD) is 0.021 µg mL . The relative -1 standard deviation (RSD) at 0.6 and 1.2 µg mL of mercury were 2.12 and 3.08 % (n=8), respectively. The method was applied for measuring the amount of mercury in water samples. 83 23rd-25th June 2010 3rd ICYC 2010 Universiti Sains Malaysia ANA-P16 LIQUID-PHASE MICROEXTRACTION (LPME) COUPLED WITH GAS CHROMATOGRAPHY FOR DETERMINATION OF FATTY ACIDS IN PALM OIL AND OTHER VEGETABLE OILS Gan Hui Siang, *Bahruddin Saad, Ahmad Makahleh and Boey Peng Lim School of Chemical Sciences, Universiti Sains Malaysia, 11800 Pulau Pinang, Malaysia E-mail: [email protected]..
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This note was uploaded on 02/17/2011 for the course CHEMISTRY 101 taught by Professor Csr during the Spring '11 term at University of Louisville.
- Spring '11