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|標題:||Fast colorimetric determination of aqueous mercaptans with microwave-assisted derivatization||作者:||Wei, M.C.
|關鍵字:||microwave-assisted derivatization;mercaptans;2-mercaptoethanol;colorimetric determination;color-developing;microwave irradiation;gas-chromatographic analysis;liquefied petroleum gas;sulfur-compounds;detector;odorants||Project:||International Journal of Environmental Analytical Chemistry||期刊/報告no：:||International Journal of Environmental Analytical Chemistry, Volume 83, Issue 3, Page(s) 255-260.||摘要:||
A microwave-assisted derivatization protocol for rapid colorimetric-determination of aqueous mercaptans is described. The color-developing reaction of mercaptans with acidic N,N-dimethyl-p-phenylenediaminedihydrochloride was accelerated by microwave irradiation. With 2-mercaptoethanol as the model species, optimum conditions for microwave-assisted color-developing were studied. Results indicated that with the proposed method, the time required to achieve the color-developing is only 15 s that is much shorter than 50 min of the conventional method; a 1.4-M hydrochloric acid (HCl) is enough to assist the color-developing reaction which is only 8-folds of 11.7 M used in conventional method; the detection sensitivity is also increased to 235% of the conventional method. An authentic water sample from Chung-Hsing Lake was tested. The proposed method provided a very fast, safe, and highly sensitive procedure to determine aqueous mercaptans.
|Appears in Collections:||化學系所|
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