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11/23/50

Proton resonances from the following two samples were
compared under identical conditions:

Sample volume = 4 cc
Molarity of Mn⁺⁺ = 0.75
Gain = 60
H_s = 0.086 G
H₁ = 1 1/2 cell ~ 0.089 G
Rate = D
H₀ ~ 1500 G

(a) 4.256 g 99.5 % D₂O was added to 0.507 g. MnSO₄·H₂O
to form 4 cc solution. It contains H to 1.28 M
(b) 4 cc. of 0.75 M Mn⁺⁺ in H₂O

Size of signal from sample (a) = 65.1

" " " " " (b) = 13.5 (attenuated to a factor 1/200)

Conclusion: [illegible] If attentuation factor is correct,
% purity of D₂O is 98.2%