Abstract
We have used proton-induced X-ray emission (PIXE) methods to determine the trace-element contamination from devices commonly used for blood collection. After a qualitative evaluation of the elemental composition of the devices, we have measured the contamination in de-ionized water and plasma samples following various experimental procedures. We have found that the Vacutainer tubes are the main source of contamination, but their effect in plasma elemental analysis is significant only in the case of zinc. Use of disposable syringes to collect blood samples seems to avoid this contamination.
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