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35.
Noddack*s value of 1.86 for the chondritic raeteoriteso This makes our ainc to
cadmium atcmie ratio equal to about 360 instead of Qoldschmidt* s estimate of
160. Better analytical data for this element is needed badlye
The meteorite analjrses by GoMschraidt and Peters (1933b) and Qoldschmidt (1937)
gave lOOp 15 and 5 PPm of tin in the metal trollite and silicate phases. Using
metal : trollite t silicate in the ratio of 10 : 5 : 85 would give about 15 Ppa
and an atomic aburdance of 19. The Noddacks (193U) give 50 for the atomic
abundance. Instead of these we have used an abundance of 2a65o The use of
Qoldschmidt's or -fee Noddacks* value would give an irregularity in the curve with
respect to 1^.1 nai^boring elements on idie basis of present knowledge. We
conclude that the smalytical data for this element are incorrect by a lai^
factor. Tin is an ele^nent which is extensively used in laboratory equipment as
solder, block tin stills for distilled water, etc. Dr. M. Fleischer advises
us that tin is often reoorted too high in silicate materials because of the use
of soldered sieves for separating crushed sanpleSo
Niobium was determined by Rankama in chondritic meteorites as 0«.5 Ppm
eqiilvalent to an atomic abundance of O.dl. This value is close to our adopted
value of loOOo
Tha silver value adopted here is much lower than indicated
by analytical data. Qoldschmidt selected a value of 3.2 for the abandance
on the basis of his own and the Noddacks* data. We find that we must us©
Qa^^g
if silver is to lie on our odd mass curve. Mr. Joensuu advises us that much
analytical data on small aiMunts of silver is incorrect because of the ease
of excitation of its resonance lines, and because of the presence of silver coins
in the pockets and hands of analystso
Also, this chalcophile element nsay be
reported too high partly because it is reoorted in high concentrations in