Method and apparatus for determining the concentration of surface-active substances in a liquid

摘要

The present invention relates to a process as well as a device for determining the concentration of surface-active substances in a liquid, in which the liquid to a container with a at an outlet arranged in the region of the floor is supplied to the capillary to form drops. In the method, a constant internal volume of the container only partially with the liquid is filled and closed off in an airtight manner, so that during the dripping of the liquid, the increasing pressure difference between the inside - and outside of the receptacle, builds up. The number of from the capillary separating droplet over a predetermined time interval, or the time for the tearing of a predeterminable number of drops is measured, in order from the measured value by comparison with reference values to determine the concentration. Dollars a the method and the associated device can be constructed in a simple manner and very low cost, without losses in the measuring accuracy with respect to known processes having to be accepted.