METHOD AND APPARATUS FOR DETERMINING THE CONCENTRATION OF AN ANALYTE CONTAINED IN A LIQUID SAMPLE

摘要

An apparatus (1) for determining the concentration of at least one analyte contained in a sample using infrared absorption measurement and/or transmission measurement has a measurement chamber having an inner cavity (4) for holding the sample. The inner cavity (4) is delimited by at least one chamber wall (2, 3), which is transparent to infrared radiation. The at least one chamber wall (2, 3) has, on its surface which adjoins the inner cavity (4), an inert coating (11, 12) which is transparent to infrared radiation. The coating is extremely thin and homogeneous. It prevents as far as possible deposits of foreign substances on the surface and has a particular configuration with which the sample filling and the sample interchange and the cleaning are particularly simple.