一种新的流动分析体系——空气整段间隔流动注射分析

A NEW FLOW ANALYSIS SYSTEM-THE WHOLE SAMPLE ZONE SEGMENTED BY AIR FOR FLOW INJECTION ANALYSIS

提出了空气整段间隔试样带,遇制试样分散的流动分析体系。设计的切换阀可使试样及空气定量注入,并能准确间隔试样带。试样留存时间(T)可大于10min,反应温度可达95℃。测定频率≥60样/小时。并保持了FIA在反应不需达到稳定态就可定量测定的特点。考察了本体系的一些性能。

A new flow analysis system has been built in which the whole sample zone is segmented by only two air bubbles. A new valve is designed to inject the sample and the bubbles into the carrier stream quantitatively. The position of the segmentation can be controlled accarately and the amount of the air introduced is minimized so that the stability of flow rate can be improved.In this system, the residence time lasts for 10 min or more,the reaction temperature can be allowed up to 95℃,and the sampling frequency reaches to 60 samples/h at least. The determination can still be proceeded at non equilibrium state. The teffects of some factors have also been discussed.