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Table 2 Assay results for the determination of benzophenone in pure forms

From: Derivative spectrophotometric analysis of benzophenone (as an impurity) in phenytoin

Parameter Proposed method Comparison method(13)
  First derivative method (1D) Third derivative method (3D) Ratio derivative method (1DD)  
% Found(a) 098.18 102.35 102.03 100.56
  100.41 099.84 100.50 099.89
  100.20 099.63 099.20 100.01
  100.37 100.12 099.66  
  099.81 099.20 100.15  
  099.96 100.51 100.11  
Mean ( x ¯ ) ± S.D. 099.82 ± 0.83 100.27 ± 1.10 100.27 ± 0.97 100.15 ± 0.36
T 0.64 0.18 0.20  
F 5.48 9.61 7.37  
  1. a The average of three determinations.
  2. N.B. Tabulated t-value at P = 0.05 is 2.36, tabulated F-value at P = 0.05 is 19.30.