The use of a multichannel capillary for electrophoretic separations of mixtures of clinically important substances with contactless conductivity and UV photometric detection

2013 ◽  
Vol 34 (14) ◽  
pp. 2058-2064 ◽  
Author(s):  
Petr Tůma ◽  
František Opekar ◽  
Eva Samcová ◽  
Karel Štulík
Keyword(s):  
Photometric Detection ◽  
Electrophoretic Separations

Study of the film formation process in liquid-liquid extraction flow injection analysis

1991 ◽  
Vol 56 (6) ◽  
pp. 1228-1237 ◽  
Author(s):  
Vlastimil Kubáň
Keyword(s):  
Flow System ◽  
Detection System ◽  
Film Formation ◽  
Liquid Extraction ◽  
Photometric Detection ◽  
Liquid Liquid Extraction ◽  
Teflon Tube ◽  
Continuous Stream ◽  
Computer Controlled ◽  
Segmented Volume

The behaviour of a thin film of an organic solvent on the walls of the extraction coil in a continuous liquid-liquid extraction flow system was studied using a computer-controlled fast-recording on-tube photometric detection system (approx. 3 ms time resolution). A single-loop injector was employed to introduce precise, reproducible volumes (Sr < 2%) of one phase into the continuous stream of the other as a segmented volume standard. The film thickness Df, ranging from 1 to 20 μm for a 0.7 mm teflon tube, was calculated from the segment lengthening at a different chloroform flow rates and was found to obey a polynominal dependence on the linear flow rate, df = f(uα), where α < 1.

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