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Table 5 Accuracy and precision data for the determination of benzophenone by the proposed methods

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

  Parameters First derivative method (1D) Third derivative method (3D) Ratio derivative method (1DD)
Intra-day % Found(a) 099.55 099.68 100.09
   099.96 101.36 101.21
   100.34 099.56 099.23
  Mean ( x ¯ ) 099.95 100.20 100.18
  S.D. 0.39 1.00 0.99
  %RSD 0.39 1.00 0.99
  %Error 0.16 0.41 0.40
Inter-day 1st day 100.10 102.06 100.31
  2nd day 100.90 101.59 098.99
  3rd day 101.98 100.66 100.11
  Mean ( x ¯ ) 100.99 101.43 099.80
  S.D. 0.94 0.71 0.71
  %RSD 0.94 0.70 0.71
  %Error 0.38 0.29 0.29
  1. N.B. Each result is the average of three separate determinations.