Figure 2. Mean extraction efficiencies for target adrenal and gonadal
steroids in pilot whale blubber, determined by a spike-retrieval
experiment with blubber samples from two individuals (RJM009 and RT48).
Analytes were quantified using isotopically matched internal standards.
DHEA, which did not have a matched internal standard, was quantified
using S-13C3. Error bars represent
standard deviation and red lines delineate the acceptable percent
recovery range (70% - 120%). RSDs are shown in the shaded bar along
the bottom.