equipped with a 300W xenon short-arc lamp (XBO 301,
GLE, Berlin, Germany) as a continuum (radiation) source was used
throughout the work. This equipment uses a compact high-resolution
double echelle monochromator and a charge-coupled device
(CCD) array detector with a resolution of about 5 pm per pixel.
Measurements were carried out at 258.056 nm. The number of pixels
in the array detector used for detecting the continuum source
(CS) line(s) was five (central pixel ± 2). An oxidising air/acetylene
flame was used for CS formation. All measurements were carried
out as five replicates.
A Topwave microwave-assisted digestion system (Analytik Jena,
Berlin, Germany) equipped with pressure controlled Teflon vessels
(50 mL) were used for food digestion. Laboratory equipment was
cleaned appropriately to avoid contamination