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. © 2010 Elsevier B.V.

Mai T.D., Schmid S., Muller B., Hauser P.C.

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Từ khóa : Automated monitoring; Capacitively coupled contactless conductivity detection; Concentration levels; Contactless conductivity detection; High voltage; Hydrodynamic injection; Inorganic cations; Sequential injection analysis; Capillary electrophoresis; Positive ions; Sampling; Electrochemistry; anion; cation; article; automation; capillary electrophoresis; controlled study; electric potential; environmental monitoring; hydrodynamics; priority journal; process design; reliability; reproducibility; sequential injection analysis