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Articles by S.A. Begum
Total Records ( 2 ) for S.A. Begum
  M.M. Rahman Khan , M.M. Rahman , M.S. Islam and S.A. Begum
  A simple UV-spectrophotometric method for the determination of the total vitamin C (ascorbic acid + dehydroascorbic acid) in various fruits and vegetables at Sylhet area is described. The spectrophotometric method involves the oxidation of ascorbic acid to dehydroascorbic acid by bromine water in presence of acetic acid. After coupling with 2,4-dinitrophenyl hydrazine at 37 °C temperature for three hours, the solution is treated with 85% H2SO4 to produce a red color complex and the absorbance was spectrophotometrically measured at 521 nm. The content of vitamin C were 12 to 118 mg/100 g in fruits and 22 to 135 mg/100 g in vegetables. The percent recovery, statistical calculation and the possible interfering factors are also discussed.
  S.A. Begum and J. Podder
  The results of the influence of co-doped bimetallic Mg(II)-Ni(II), Mg(II)-Co(II), Mg(II)-Li(I) impurities on metastable zone width and induction period for the nucleation of KDP crystals are discussed in this study. In order to grow bulk crystals with faster growth rates along all the crystallographic directions, the solubility, metastable zone width, induction period and interfacial energy etc., are necessary to know to optimize the growth conditions. Metastable zone width, induction period and interfacial energy have been determined. Interfacial energy has been estimated using the experimentally determined induction period values based on the classical nucleation theory for a spherical nucleus. The presence of co-doped bimetallic Mg(II)-Ni(II), Mg(II)-Co(II), Mg(II)-Li(I) impurities is found to enhance the metastable zone width, induction period, interfacial energy and also minimizes the formation of secondary nucleation. This phenomenon may be attributed due to the absorption of impurities on the surfaces of the growing nuclei.
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