Elemental concentration of selenium in bovine plasma at parts-per-billion l
evels was determined using radiochemical neutron activation analysis (RNAA)
. This study was connected with the relation between the Enteque Seco, a to
xic bovine calcinosis, and the Se status. The technique developed is based
on the coprecipitation of Se with HgS. Good agreement with certified refere
nce materials have been found. The values for the Se contents in normal bov
ine samples were in concordance with literature values.