A Study of the Cyanide Compounds Content
Samples, about 1-2g in weight, were taken by chipping
pieces from bricks and concrete or scrapping off,
particularly in the case of plaster and also mortar. The
materials taken were secured in plastic containers marked
with serial numbers. All these activities were recorded and
documented with photographs. Work connected with them took
the commission two days. The laboratory analysis of the
material collected was conducted - to ensure full
objectivity - by another group of Institute workers. They
started with preliminary work: samples were comminuted by
grinding them by hand in an agate mortar, their pH was
determined at 6 to 7 in nearly all samples. Next the samples
were subjected to preliminary spectrophotometric analysis in
infrared region, using a Digilab FTS-16 spectrophotometer.
It was found that the bands of cyanide groups occurred in
the region of 2000-2200 cm-1 in the spectra of a dozen
samples or so. However, the method did not prove to be
sensitive enough and was given up in quantitative
determinations. It was determined, using the
spectrographical method, that the main elements which made
up the samples were: calcium, silicon, magnesium, aluminium
and iron. Moreover, titanium was found present in many
samples. From among other metals in some samples there were
also barium, zinc, sodium, manganese and from non-metals
boron.
The undertaking of chemical analysis had to be preceded by
careful consideration. The revisionists focussed their
attention almost exclusively on
Prussian blue, which is of
intense dark-blue colour and characterized by exceptional
fastness. This dye occurs, especially in the form of stains,
on the outer bricks of the walls of the former bathdelousing
house in the area of the Birkenau camp. It is hard to
imagine the chemical reactions and physicochemical processes
that could have led to the formation of Prussian blue in
that place. Brick, unlike other building materials, very
feebly absorbs
hydrogen cyanide, it sometimes does not even
absorb it at all. Besides, iron occurring in it is at the
third oxidation state, whereas bivalent iron ions are
indispensable for the formation of the [Fe(Cn)6]-4 ion,
which is the precursor of Prussian blue. This ion is,
besides, sensitive to the sunlight.
J. Bailer
(1) writes in the collective work "Amoklauf gegen
die Wirklichkeit" that the formation of Prussian blue in
bricks is simply improbable; however, he takes into
consideration the possibility that the walls of the
delousing room were coated with this dye as a paint. It
should be added that this blue coloration does not appear on
the walls of all the delousing rooms.
We decided therefore to determine the cyanide ions using a
method that does not induce the breakdown of the composed
ferrum cyanide complex (this is the blue under discussion)
and which fact we had tested before on an appropriate
standard sample. To isolate cyanide compounds from the
materials examined in the form of hydrogen cyanide we used
the techniques of microdiffusion in special Conway-type
chambers. The sample under examination was placed in the
internal part of the chamber and next acidified with 10%
sulfuric acid solution and allowed to remain at room
temperature (about 20°C) for 24 hrs. The separated hydrogen
cyanide underwent a quantitative absorption by the lye
solution present in the outer part of the chamber. When the
diffusion was brought to an end, a sample of lye solution
was taken and-the pyridine-pyrazolone reaction carried out
by Epstein's method
(3). The intensity of the polymethene
dye obtained was measured spectrophotometrically at a
wavelength equal to 630nm. The calibration curve was
constructed previously and standards with a known CN-
content were introduced into each series of determinations
to check the curve and the course of determination. Each
sample of materials examined was analysed three times. If
the result obtained was positive, it was verified by
repeating the analysis. Having applied this method for many
years, we have opportunities to find its high sensitivity,
specificity and precision. Under present circumstances we
established the lower limit of determinability of cyanide
ions at a level of 3-4 ,µg CN- in 1 kg of the sample.
The results of analyses are presented in
Tables I-IV. They
unequivocally show that the cyanide compounds occur in all
the facilities that, according to the source data, were in
contact with them. On the other hand, they do not occur in
dwelling accomodations, which was shown by means of control
samples. The concentrations of cyanide compounds in the
samples collected from one and the same room or building
show great differences. This indicates that the conditions
that favour the formation of stable compounds as a result of
the reaction of hydrogen cyanide with the components of the
walls, occur locally. In this connection it takes quite a
large number of samples from a given facility to give us a
chance to come upon this sort of local accumulation of
cyanide compounds.
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in the Walls of the Gas Chambers
in the Former Auschwitz & Birkenau
Concentration Camps
Methodology: Part I