Sample introduction system for non-segmented continuous flow analysis.

摘要

Sample injection system for nonsegmented, continuous flow analysis comprising an inlet channel (2), an analyzer channel (3) and a carrier stream channel (4), connected in a confluence point (1), an aspirating pump (6) in the analyzer channel, a carrier stream pump (5) in the carrier stream channel with a higher capacity than the aspirating pump (6), and an analyzer (7). In a first step prior to the sample injection, the carrier stream pump (5) forwards carrier stream to the confluence point (1), the aspirating pump (6) sucks carrier stream from the confluence point (1), and an outflow of carrier stream drains through the inlet channel (2). In a second step, the carrier pump (5) is stopped, the inlet end (10) of the inlet channel (2) is brought in contact with the sample solution (14), and the aspirating pump (6) sucks sample into the inlet channel (2) and the analyzer channel (3). In the third step, the carrier pump (5) is restarted, whereby the sample in the analyzer channel (3) is aspirated into the analyzer (7), and all the sample in the inlet channel (2) is pressed out into the waste (8). The analyzer (7) may be a flow-through detector, dialyzer, or any other apparatus for analysis. The performance can also be made as a multi-channel system for simultaneous analysis of several components in different analyzers. In the above embodiments, the sample container must be connected and disconnected at precisely defined times. In order to avoid this, a second channel (17) can be added to the carrier pump (5) to make a double channel, the second channel (17) being connected to an outlet (16) from the inlet channel (2). The sample passes through the analyzer (7) and exits through the aspirating pump (6). By instead connecting the second channel (17) of the double channel pump to the analyzer channel (3) at a point between the analyzer (7) and the aspirating pump (6), the sample can be sucked in through the analyzer (7) and after analysis be forced back the same way.