کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1210593 | 1493779 | 2006 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Classification and comparison of capillary columns by determination of the solution enthalpy of polar and non polar probes
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The behaviour and separation characteristics of capillary columns containing different stationary phases (bonded methyl- and methylphenylsiloxanes and polyglycols, and carbon layer and porous polymer) were classified and compared by measuring the values of the solution enthalpy ÎHs of n-alkanes and 1-alcohols at various temperatures. The difference in ÎHs values between straight-chain 1-alcohols and n-alkanes with the same number of carbon atom (ÎÎHs) does not change with changing temperature when gas-liquid partition stationary phases are used, but depends on the column composition and polarity and therefore permits to evaluate the influence of polarity on the solute-solvent interaction. The trend of the ÎÎHs values is correlated with that of the ÎC parameter and with the McReynolds' polarity constants.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Chromatography A - Volume 1101, Issues 1â2, 6 January 2006, Pages 261-267
Journal: Journal of Chromatography A - Volume 1101, Issues 1â2, 6 January 2006, Pages 261-267
نویسندگان
S. Vezzani, P. Moretti, G. Castello,