Methods devices and calibration techniques for analysis by extraction

摘要

A method of calibrating an extraction apparatus by analysing a standard after diversion through a by-pass circuit which does not send the standard through the extraction chamber. Other inventions relate to a calibration technique including use of a plug of inert material comprising a known amount of analyte; and a method of cleaning an extraction vessel using a porous plug of inert material; A method of analysing a carbonaceous analyte by extraction in the presence of a diluent; An extraction technique wherein the extraction fluid enters the extraction vessel from above and below the sample; A sample receptacle for use in extraction wherein the receptacle includes a removable cover having a liner; An extraction chamber comprising a sample receptacle with a collar wherein the receptacle has a removable cover, and is connected to an IR analysis cell; A method of extraction wherein the rate of delivery of extraction fluid is reduced to permit analytes to migrate into the extraction fluid.