Gil Macarrn et al., 2014: THE MOUNTING OF TWO BIRDS
An Agilent Technologies.GC-6890NMS.5973
held there for 0.5 minute, increased by
chromatograph, with a HP-5MS (5% phenyl,
40C/min to 150C, held there for 3 minutes,
95% dimethylpolysiloxane) capillary column
then increased by 5C/min to 300C, and held
(length: 30 m, internal diameter: 250 m ~
there for 5 minutes. The ionization mode was
film thickness: 0.25 m) and with a flow of 1
an electron impact (EI+) m/z range between
mL/min of helium as the carrier gas, was used.
50 and 550. The data were acquired and
The oven was programmed to start at 100C,
processed with ChemStation Agilent program.
Figure 8: SEM images of different morphologies of the arsenic particles (BSE detector). A) detail of a laminar particle in the pink
flamingo; B) detail of white arsenic powder; C) detail of arsenic particles in the Golden eagle.
RESULTS AND DISCUSSION
Composition
Arsenic
based
compounds
and
calcium
Preservative
compounds were detected in both preservatives
(lime has probably also been used as an
Morphology
ingredient). Sodium based compounds are also
As can be appreciated in figures 8A and 8C,
detected in both, which may derive from the
there are differences in the preservative
use of soap in the preparation of the
particles of both pieces: in the golden eagle
preservatives. As is well known, caustic soda is
particles have pyramidal morphology, similar to
used in the process that produces soaps from
that
observed
in
an
arsenic
trioxide
fats; this compound reacts with fatty acid and
microsample (Figure 8B). On the other hand,
the ester group of glycerides in a hydrolysis
the morphology of the particles in the
process, forming sodium salt of fatty acids. On
preservative for the pink flamingo is lamellar.
the other hand, soap is one of the ingredients
No particles with this morphology have been
of arsenic soap. Moreover, in the pink flamingo
detected to date among those that constitute
preservative, the microanalysis detected the
the eagle preservative.
presence of potassium, which might indicate
that tartar salt (potassium acid tartrate)
has
been
used
in
the
mixture.
In
the study
sample
for
the golden
Figure 9: Details of the polychrome applied to the legs (A) and beak (B) of the Golden Eagle made by Benedito Brothers.
82
Journal of Paleontological Techniques