Activity testing and surface characterization of pretreated fused-silica capillaries for gas chromatography

摘要: Abstract A new modification of existing intermediate capillary column tests for uncoated columns is presented. short (1 m), thick film (2 μm) precolumn coupled to the be tested. The use a results in rapid test. This makes it attractive terms time inject test compounds separately, thus excluding mutual influences, diluted solutions spiked with n-alkanes as references. Moreover, gives sharp Gaussian injection profiles on second column. simple versatile coupling device has been developed, which permits easy control and adjustment pressures carrier flows, monitoring effluents introduction input bands monitor detector accurately shows shape evaluation peak distortion, shift yield Test were selected basis their physico-chemical properties (vapour pressure, acid-base properties, dipole moments, hydrogen bonding, complexation metals, etc.). number differently pretreated capillaries tested these under various external conditions. Accurate quantification qualification activity present difficulties. case nearly ideal non-linear chromatography. When peaks different sizes are superimposed, tails lie common envelope. k′ end tail fixed, irrespective amount injected, forms an important parameter evaluation. Reconstruction chromatogram scale instead eliminates influence velocity length. method sensitive tool testing promises surface characterization.