Highly sensitive spectrofluorimetric determination of cysteine by Cu2+-morin complex |
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Authors: | Wen-Sheng Liao Fang-Ying Wu Yu-Mei Wu Xiao-Jiao Wang |
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Institution: | (1) Department of Chemistry, Lanzhou University, Lanzhou, P.R. China |
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Abstract: | p-Toluenesulfonylamide was immobilized on silica gel and on nm-sized silicium dioxide (SiO2). Their adsorption efficiency toward metal ions was investigated by the batch equilibrium technique. Although silica gel
and nm-SiO2 have the same composition (silicon and oxygen), the difference in their sizes and surface structures results in distinct
chemical activity and selectivity. At pH 4, the adsorption capacity of modified silica gel adsorbent was found to be 4.9,
5.0, 33.2, and 12.6 mg g−1 for Cr(III), Cu(II), Pb(II) and Zn(II), respectively. However, the adsorption capacity of nm-SiO2 adsorbent toward Cr(III) was 26.7 mg g−1 under ultrasonic dispersing. The potential application of p-toluenesulfonylamide-modified silica gel for simultaneous preconcentration of trace chromium, copper, lead and zinc from
two standard reference materials and two food samples was performed with satisfactory results.
Correspondence: Xijun Chang, Department of Chemistry, Lanzhou University, Lanzhou 730000, P.R. China |
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Keywords: | : Trace elements silica gel nanometer SiO2 ICP-AES p-toluenesulfonylamide |
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