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Capillary electrophoresis with contactless conductivity detection coupled to a sequential injection analysis manifold for extended automated monitoring applications |
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| Authors: | Thanh Duc Mai Stefan Schmid Peter C. Hauser |
| Affiliation: | a University of Basel, Department of Chemistry, Spitalstrasse 51, 4056 Basel, Switzerland b Centre for Environmental Technology and Sustainable Development (CETASD), Hanoi University of Science, Nguyen Trai Street 334, Hanoi, Viet Nam c Swiss Federal Institute of Environmental Science and Technology (EAWAG), Limnological Research Center, 6047 Kastanienbaum, Switzerland |
| Abstract: | A capillary electrophoresis (CE) instrument with capacitively coupled contactless conductivity detection (C4D) based on a sequential injection analysis (SIA) manifold was refined. Hydrodynamic injection was implemented to avoid a sampling bias by using a split-injection device based on a needle valve for precise adjustment. For safety and reliability, the integrity of the high voltage compartment at the detection end was fully maintained by implementing flushing of the high voltage interface through the capillary. With this set-up, extended fully automated monitoring applications are possible. The system was successfully tested in the field for the determination of the concentration levels of major inorganic cations and anions in a creek over a period of 5 days. |
| Keywords: | Sequential injection analysis Capillary electrophoresis Capacitively coupled contactless conductivity detection Inorganic cations and anions |
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