Liquid Chromatography Detectors - The Electrical Conductivity Detector > Page 88


Courtesy of Dionex Inc.


A proprietary ion exchange column, IonPacCS12, was used and the mobile phase consisted of a 20 nM methanesulphonic acid solution in water. A flow rate of 1 ml/min was employed and the sample volume was 25 ml.


1. Lithium 2. Sodium 3. Ammonium
4. Potassium 5. Magnesium 6. Calcium


Figure 57. Determination of Alkali and Alkaline Earth Cations

The electrical conductivity detector has a sensitivity (minimum detectable concentration) of about 5 x 10-9 g/ml and a linear dynamic range of about 200 where 0.97 < r < 1.03. It is used in probably over 95% of all analyses involving ion exchange procedures to separate inorganic and organic ions.