Method and disposable devices for micro extraction

摘要

An apparatus for carrying out liquid-liquid micro extraction or liquid-liquid-liquid micro extraction with high enrichment comprises: a) a container for a sample solution having volume Vs with dissolved substance, analyte, to be analysed, b) a second container arranged in the first container, preferably a disposable container, having permeable membrane walls, for an acceptor solution, having volume Va, wherein 1) Vs:Va /= 50 and 2) about 1 mu l /= Va /= 50 mu l, c) stirring means, preferably a magnetic bar. The method is applicable for liquid-liquid micro extraction (LLME) and liquid-liquid-liquid micro extraction (LLLME) with high enrichment. In the latter case, a liquid immiscible with the sample solution and the acceptor solution is immobilised in the wall of the container for the acceptor solution. There is also described a disposable device for use in liquid-liquid micro extraction in the form of a sponge body having defined pore volume for absorption of an immobilised acceptor solution for an analyte from a volume of a sample solution.