Parameter Atenolol Concentration (µg/mL)
0.50 4.00 8.00  
Intraday % Found 99.4 99.48 100.64
99.02 100.52 100.23
100.61 98.99 99.76
Mean 99.68 99.66 100.21
S.D. 0.83 0.78 0.44
% RSD 0.83 0.78 0.44
% Error 0.48 0.45 0.25
Interday % Found 99.4 99.48 100.64
101.11 99.62 101.05
99.44 100.7 99.8
Mean 99.98 99.93 100.50
S.D. 0.98 0.67 0.64
% RSD 0.98 0.67 0.63
% Error 0.56 0.39 0.37
S.D. 0.98 0.67 0.64
N.B. Each result is the average of three separate determinations
Table 10: Accuracy and precision data for the determination of atenolol by the HPLC method.