Hi Bob,
On Tue, Mar 29, 2016 at 8:30 AM, Bob Cook <[email protected]> wrote:
If I am not wrong, the laser activation indicates Zn is 0.004 mass % vs
> the suggested 4%—more than an order of magnitude LOW!—more like 3 orders
> Low! I checked the table of mass % and it adds to 100 percent.
>
You're comparing apples to oranges.
1. The 4.4% is the fraction of 64Ni of all nickel atoms, not all
species. You can see this by adding up all of the numbers for nickel on
slide 14 and seeing that they sum to 99.9%.
2. I understand that the 4.4% (mass-weighted?) relative fraction was
derived, possibly by Parkhomov, from counts at different mass peaks
recorded by a multi-channel analyzer, perhaps using the incorrect
assumption that all peaks at mass 64 were for nickel.
3. The 0.004 mass % for zinc is a comparison of the element zinc with
all species present, and not just nickel.
4. The 4.4% comes from a different kind of assay (ICP-MS, slide 14) than
the 0.004 mass % ("ICIG RAS", slide 13).
Because the 4.4% 64Ni is a fraction of all nickel present, rather than all
species, there needs to be a further translation to the fraction of all
species. Getting this fraction requires making assumptions about how
Parkhomov got to 4.4 percent. By one set of assumptions, the 4.4% goes way
down when adjusted to be commensurable with the 0.004 mass % for zinc.
Eric
