11.0% for HG-AAS respectively). Obtained data of repeatability
are comparable to other references [21,13].
The linearity of the measurements was provided and
confirmed for all three techniques. Lower detection limit was
calculated in the ET-AAS technique with deuterium background
correction and HG-AAS (Table 4), that is necessary for the
selenium determination in vegetables and determines successful
application of the method.
5. Conclusion
Comparison of the following methods for selenium determination
(ET-AAS with deuterium background correction, Zeeman
background correction and HG-AAS) showed that method
ET-AAS with deuterium background correction was not able to
distinguish the signal of blanks and vegetable samples with low
Se content. That means: sensitivity of this method is insufficient
for selenium determination in vegetable samples with low Se
content. HG-AAS method and ET-AAS method with Zeeman
background correction are able to distinguish signal of blank
and vegetable samples correctly. Comparison of values of
detection and determination limits showed that HG-AAS
method produces lower values. This is a very important
conclusion for selenium determination in the plant samples
with low selenium content.