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Table 4 Statistical comparison for the results obtained by the proposed spectrophotometric methods, the reported method [23] for the analysis of DRO and official methods [24, 25] for analysis of CAF and PCT

From: Different applications of isosbestic points, normalized spectra and dual wavelength as powerful tools for resolution of multicomponent mixtures with severely overlapping spectra

Values DRO CAF PCT
Proposed methods Reported method [23]a Proposed methods Official method [24]b Proposed methods Official method [25]c
D0 RD-Iso IRD DD-RD-DW AAS AAM S1DD RD-Iso IRD AAS AAM S1DD RD-Iso IRD DD-RD-DW
Mean 99.79 99.93 99.91 99.80 100.25 99.01 99.90 99.82 99.72 99.83 99.56 100.14 100.18 99.63 100.08 100.19 100.05 99.98
SD 0.48 0.57 0.30 0.49 0.39 0.81 0.78 0.65 0.79 0.70 0.59 0.21 0.58 0.40 0.45 0.16 0.27 0.25
RSD% 0.481 0.570 0.300 0.490 0.389 0.818 0.780 0.651 0.792 0.701 0.592 2.097 0.578 0.402 0.449 0.159 0.269 0.250
n 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5
Variance 0.2304 0.324 0.0900 0.240 0.1521 0.6561 0.6084 0.4225 0.6241 0.49 0.3481 0.0441 0.3364 0.1600 0.2025 0.0256 0.0729 0.0625
Student’s t testd (2.306) 1.663 1.036 0.1609 1.607   1.227 0.7774 0.6623 0.3629 0.5281   1.096 0.7081 1.659 0.4344 0.1523 0.4254  
F valued 1.515 2.136 1.690 1.579   1.885 1.748 1.214 1.793 1.408   1.417 5.382 2.560 3.240 2.441 1.166  
  1. aDualwavelength spectrophotometric method at 271.5 and 280.0 nm
  2. bPotentiometric titration using 0.1 M perchloric acid
  3. cDirect UV spectrophotometric method, measuring the absorbance in water at 244 nm
  4. dThe values in the parenthesis are the corresponding theoretical values of t and F at P = 0.05