Simulation of the effects of negative thermal gradients on separation performance of gas chromatography.
Simulation of the effects of negative thermal gradients on separation performance of gas chromatography.
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负热梯度对气相色谱分离性能影响的模拟
DOI:
10.1016/j.chroma.2021.461943
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发表时间:
2021
期刊:
影响因子:
--
通讯作者:
Boeker
中科院分区:
文献类型:
--
作者:
Leppert;Blumberg;Leonid M;Matthias;Boeker
The effect of a gradient of solute velocity on the chromatographic separation of closely spaced solutes is investigated by usage of a simulation. The concept of theideal basic separation(IBS), introduced by Blumberg, is used to determine the theoretical limit of a separation without any natural or artificial gradients of features of the chromatographic medium. The IBS is the best achievable separation and can therefore be used as a baseline to which other separations can be compared to. An addition of a negative velocity gradient cannot improve the separation of closely spaced solutes. The velocity gradient is realized by adding a temperature gradient to a GC separation. The simulation confirms this theoretical limit for a range of differently strong retained solutes.In a second part controlled deviations from IBS are used to show, that a velocity gradient can be beneficial in realistic, non-IBS. The addition of a negative velocity gradient can improve e.g. the separation of broad injected solute zones or counteract a positive gradient of the mobile phase velocity caused by gas decompression along the GC column. However, the improved separation cannot exceed that of a corresponding ideal basic separation. The resolution of broadly injected solutes can be increased by up to 45% of the corresponding IBS resolution by adding a negative velocity gradient. A positive velocity gradient due to gas decompression reduces the separation by up to 6%. The added negative velocity gradient, realized by a linear temperature gradient, can compensate this resolution loss by up to 2%.
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影响因子:
1.3
作者:
J. Phillips;V. Jain
通讯作者:
V. Jain
影响因子:
7.4
作者:
Blumberg;Klee
通讯作者:
Klee
影响因子:
4.1
作者:
Lena N. Jeong;S. Rutan
通讯作者:
S. Rutan
DOI:
--
发表时间:
2003
期刊:
影响因子:
--
作者:
P. Sewell
通讯作者:
P. Sewell
DOI:
10.1016/j.chroma.2014.10.090
发表时间:
2014
期刊:
Journal of chromatography. A
影响因子:
--
作者:
H. Tolley;Samuel E. Tolley;Anzi Wang;Milton L. Lee
通讯作者:
Milton L. Lee