Instrumental neutron activation, proton induced X-ray emission and energy-dispersive X-ray fluorescence procedures were employed
for trace element determinations in samples of fractionated air particulate matter deposited on filters. The techniques are
well suited to analyse the generally small samples. However, indications of bias between techniques were found in the analysis
of individual filters. This may be rectified with the development of matched reference materials. The three techniques were
used in this work to determine trace elements in bulk samples of air particulate matter and in a set of intercomparison samples
of fine air particulate matter on filters. The test results on these materials showed good agreement among the employed techniques
and demonstrated the quality potential of air particulate analyses.