PPT Slide

TECHNIQUE #2 Internal Standard Analysis

(relative class)

Sample doped with known amount of reference material (internal standard)
• The weight fraction of the unknown phase J in the doped sample x’J is given by:
  x’J = xJ (1-xS)
  where xJ is weight fraction of phase J in the undoped sample, xS is the weight fraction of the internal standard.
  

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