Explore BrainMass
Share

Archaeological Chemistry - Corrected Elemental Concentration

This content was STOLEN from BrainMass.com - View the original, and get the already-completed solution here!

Answer the following questions, showing calculations and equations where appropriate:
1. Steponaitis, Blackman, and Neff (American Antiquity 61:555-572, 1996) use the following correction for bulk elemental concentrations measured in shell- tempered pottery: e' = (1000000*e)/(1000000-2.5Ca), where e' = corrected elemental concentration, e = originally measured elemental concentration, Ca = concentration of calcium, and all measurements are in parts per million (ppm). Explain how this correction works. Hint: Assume that the shell temper is pure calcium carbonate, CaCO3.

© BrainMass Inc. brainmass.com October 16, 2018, 3:55 pm ad1c9bdddf
https://brainmass.com/chemistry/environmental-chemistry/archaeological-chemistry-corrected-elemental-concentration-8324

Solution Preview

e' = 1000000*e/(1000000 - 2.5Ca)
divide by 10^6 (=1000000) in numerator and denominator, we get,
=> e' = e/[1 - {2.5*Ca*10^(-6)}]
=> e' = e/[1 - {(100/40)*Ca*10^(-6)}]
Now look at this expression: (100/40)*Ca*10^(-6)
because,
Ca = concentration in ppm
therefore,
Ca*10^(-6) = parts of calcium per unit of the material, i.e., ...

Solution Summary

The solution answers the question with explanation and a step-by-step equation process.

$2.19
Similar Posting

War on drugs

I have to do a power point slide on the war on drugs. The thing is that the questions I have to answer are hard to find the answers too. I have looked on the internet and I am feeling that maybe I have looked over something. So I need some good pointers on this question if any body has any and or some good web sites to look at for the information I need.

War on Drugs

1. Are the current laws and policies effective? Why or Why not?

2. Are there any drawbacks to your solution?

View Full Posting Details