کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1208239 | 965297 | 2007 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Temporal shifting: A hidden key to the skewed peak puzzle
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آنالیزی یا شیمی تجزیه
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چکیده انگلیسی
The recorder-provided peak position for flow-type chemical instruments has been verified mathematically as being comprised of a “spatially-non-existent” shift, which is generated due to the relativity in accounting for the detection at a fixed point. This shift, denoted as Φ, can be approximated by Φâ0.5μt2, where μt is the temporal expanding coefficient of the system given. For flow injection analysis, the shift is correlated to a longitudinal dispersion coefficient D and the flow speed u, i.e., Φ â D/u2. For linear chromatography, it is correlated to a dynamic partition ratio kâ³ and a scaling factor f of the column used, i.e., Φ â 0.5kâ³f. In combination, the temporal shift can be expressed as Φ â 0.5kâ³f + D(kâ³Â + 1)2/u2. Although the shift may be small in scale, it provides a clue to decipher the basic parameters from a recorded peak. Under a linear isotherm, this parameter can be estimated readily from an experimental peak following a very simple procedure.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Chromatography A - Volume 1139, Issue 1, 12 January 2007, Pages 104-108
Journal: Journal of Chromatography A - Volume 1139, Issue 1, 12 January 2007, Pages 104-108
نویسندگان
Su-Cheng Pai, Ling-Yun Chiao,