A METHOD AND AN APPARATUS FOR PERFORMING ROUTINE ANALYSIS SUCH AS POLAROGRAPHIC OR SPECTROPHOTOMETRIC ANALYSIS

摘要

Method and apparatus for performing routine assays such as polarographic or spectrophotometric analysis of a large number of sample solutions arranged on or placed in a holder (101) of sample cup along a path, the samples being sucked out of the sample well (102), following consecutive cycles, by a suction device (103), then they are transferred into a common container which is carried out the analysis. The invention consists of using a container (105) having a lower outlet (107) communicating with an analysis cell (112) or the ambient space via a channel (116) which is effective only when the level of sample in the container (105) exceeds a certain threshold level, and a suction mouth (108) in the upper part of the container (105) communicating through a valve (109) with the ambient space . The suction device is a suction tube (103) having a fixed end coupled to the input (106) of the container (105) and a free end of the suction tube (103) can be switched by an organ appropriate in two different working positions. A continuous suction effect is exerted on the fixed end of the suction tube during all cycles of series while the free end of the suction tube is rotated, in the first phase of each cycle, in its first working position wherein the free end quenching in the sample cup whose turn it is and is placed opposite to the suction pipe and in the second phase, it is rotated into its second working position wherein said free end projects into the ambient space. The analysis is performed when the sample level in the vessel has exceeded a predetermined threshold level and at the end of the analysis an overpressure is established in the container. Then, the suction tube is again switched into its first working position, where the