This setup is based on a 28 port cheminert stream selector (Valco Instruments). It enables loading 25 samples simultaneously, selecting them remotely and transfering to the flow-through capillary cell (quartz, ID 2 mm and OD 2.1 mm). The capillary can be cleaned and dried in between successive measurements. This capillary cell is operated with minimum air gap and it is temperature controlled by a Peltier stage (the range about 5 to 80 °C ).