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Table 3 Results of study of repeatability and intermediate accuracies and precisions of proposed methods

From: Application of two charge transfer complex formation reactions for selective determination of metformin hydrochloride in pharmaceuticals and urine

Method MEB taken, μg mL-1 Within-day accuracy and precision (n = 7) Inter-day accuracy and precision (n = 5)
MEB found, μg mL-1 %RE %RSD MEB found, μg mL-1 %RE %RSD
PCA method 160.0 158.9 0.68 0.54 161.2 0.75 1.75
200.0 202.1 1.05 0.72 202.3 1.15 0.96
240.0 244.7 1.96 0.95 244.9 2.04 1.34
DDQ method 32.0 31.4 1.87 1.13 31.3 2.18 1.34
40.0 39.7 0.75 0.67 39.6 1.00 0.78
48.0 48.3 0.62 0.82 48.4 0.83 1.09