2013 Volume 13 Issue 1 Pages 46-51
Acceleration of liquid mixing in micro channel can further reduce the analysis time and the size of analysis device. While the acceleration leads to better performance of microreactors, measurement methods for its evaluation are limited and insufficient. The developing measurement methods of the concentration distribution of reaction product in micro channel are conductive to evaluation of the mixing performance of microreactors and to visualization of the reaction process in microreactors. Therefore, the measurement method of product concentration distribution in microreactors are proposed and evaluated in the present study. The distribution of reaction product, [Fe(SCN)2]+ (blood red) which is produced by reaction between Fe3+ (yellow) and 2SCN- (colorless), is measured by detecting the intensity of transmitted light using a color CCD camera. Applying two-color method in the concentration measurement is shown to significantly reduce uncertainty due to fluctuation of backlight. The best color combination to take intensity ratios is found to be green and red because it can avoid measurement error due to the misrecognition of reactants as low concentration products.
