SAMPLE-HOLDING ELEMENT, ANALYSIS SET AND METHOD FOR ANALYZING A LIQUID, IN PARTICULAR A COOLING LUBRICANT EMULSION

The invention provides a sample-holding element (20) for a liquid sample for simultaneous analysis of three or more chemico-physical parameters of the liquid by means of an analysis device. The sample-holding element (20) comprises a sample- holding space (31) that can be filled with the liquid, wherein the sample-holding element (20) comprises at least three measuring points (24, 25, 26, 26N, 27) in adjacent arrangement with respect to each other distributed across the sample-holding space (31), wherein two of the measuring points (24, 25) are a photonic measuring point (24) and a refractive index measuring point (25), and wherein the at least one further measuring point is selected from the group comprising at least one pH measuring point (26), one conductivity measuring point (27), and one germ measuring point. The sample- holding element (20) is a planar element (20) that is double-walled at least in sections and has two planar-parallel plates (30, 30?) arranged on top of each other that are connected to each other at least in sections at their edges, wherein the sample-holding space (31) is designed in the form of a gap in planar manner between the two plates (30, 30`), and a distance between the plates (30, 30?) is just so large that the liquid sample between the double walls (30, 30?) can be subjected to the capillary effect. The measuring point (25) for the refractive index measurement comprises a refractive structure (25?, 25??) at one of the plates (30, 30?) in an area predetermined for this purpose. Furthermore an analysis device set, which comprises the sample-holding element (20) and an analysis apparatus (1), and a method for simultaneous analysis of three or more different chemico-physical parameters of the liquid are provided.