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The seasonal dependence of PM10 Equivalence testing

The equivalence testing of automatic analysers and non-referent samplers for PM10 particle fractions with referent samplers is required according to European Directive 2008/50/EC. The aim of this article was to assess the annual and seasonal correction functions for the ESM Andersen FH-61 IR automatic analyser and for the HVS Digitel DH-80 nonreferent sampler. For the purposes of equivalence testing, the LVS Sven Leckel SEQ referent sampler was used. Furthermore, the aim of this investigation was to determine the influence of equivalence testing on statistical parameters for air quality assessment. The non-referent devices did not satisfy the measuring uncertainty requirements (U < 25 %) for both yearly and seasonal data sets. The corrected results satisfied the measuring uncertainty requirements, except for the autumn data sets and the yearly data set obtained by the automatic analyser. The statistical parameters for air quality assessment obtained by non-referent devices were significantly lower than the parameters obtained by the referent sampler. The correction functions of non-referent devices significantly differed among each other. This analysis points out the necessity of seasonal corrections of PM10 concentrations obtained by non-referent devices.

PM10; orthogonal regression; correction function; expanded measuring uncertainty

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