芯片毛细管电泳-原子荧光在线联用设计

讨论了芯片毛细管电泳-原子荧光在线联用技术的若干问题。针对芯片的集成化特点，直接在芯片上蚀刻了一条补充液通道，优化了芯片设计、芯片-原子荧光接口、气液分离器以及原子化器等，成功地消除了引入流体(补充液HCl、还原剂KBH₄和氩气)对芯片电泳分离的不利影响。

Chip-Based Capillary Electrophoresis On-Line Coupled with Atomic Fluorescence Spectrometry and Its Application to Rapid Speciation Analysis

Chip-based capillary electrophoresis (chip-CE) is under rapid progress due to its high efficiency, fast separation, little sample consumption and integration. Due to the short optical path (30-50 microm), the conventional UV absorbance cannot satisfy the chip detection needs. Atomic fluorescence spectrometer (AFS) is a selective and sensitive detector for hydride-forming elements. With the strong points of low cost and easy operation, AFS is attractive as an ideal detector of chip-CE for mercury, arsenic and selenium, etc. A few important practical aspects of coupling chip-CE to AFS are critically discussed. These include the design of the chip, chip-AFS interface, gas-liquid separator, AFS atomizer, and elimination of the effect of backpressure on separation. The application of the developed chip-CE-AFS to the mercury speciation analysis is highlighted.