Determination of silver in geological samples using high-resolution continuum source electrothermal atomic absorption spectrometry and direct solid sampling |
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| Authors: | Ingrid M. Dittert Daniel L. G. Borges Bernhard Welz Adilson J. Curtius Helmut Becker-Ross |
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| Affiliation: | 1. College of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, PR China
2. College of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan, 430074, PR China
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| Abstract: | A DNA biosensor was constructed by immobilizing DNA on a glassy carbon (GC) electrode modified with multiwall carbon nanotubes (MWNTs) dispersed in Nafion (DNA/MWNTs/GCE). The DNA-modified electrode exhibited two well-defined oxidation peaks corresponding to the guanine and adenine residues of DNA, respectively. The effects of the adsorption potential, DNA concentration and quantity of MWNTs used for DNA immobilization were investigated, as were the effects of buffer, pH and scan rate on the voltammetric behavior of DNA. Phenol, m-cresol and catechol showed noticeable inhibition towards the response of the electrode due to their interactions with DNA. These findings were used to design biosensors with linear response to these phenolic pollutants. |
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