ABSTRACT An intensive development of analytical techniques destined for the measurement of components of gaseous media (atmospheric air, inner air and air at the work-place) has been observed for many years. Aspirations for obtaining results of adequate quality is closely connected with this tendency and this is why we are forced to employ matrix-free (standard gaseous mixtures) or matrix reference materials. Thanks to the application of reference materials of both a matrix composition and a level of analyte content similar to the composition of actual samples, it is possible to obtain much more reliable results of measurements. The reference materials are also considered necessary instruments for the elaboration and validation of new analytical methodologies. They are also the subjects of different types of interlaboratory studies. Their application provides the maintenance of measuring traceability [1-3]. The range of available reference materials containing analytes in solid and liquid matrices is wider and wider. However, the problem is that the availability of gaseous reference materials is limited. First of all, it results from the fact that there are difficulties regarding the stability of this type of reference materials. For this reason, all the available techniques of preparing gaseous standard mixtures cannot be used for the preparation of adequate standard matrix-free reference materials [4,5].
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