Inter-day Intra-day  
 
Confidence limitb Accuracy Er% Precision RSD% Recovery % Confidence limitb Accuracy Er% Precision RSD% Recovery %a Added µgm L-1
                   
4.89 ± 0.14 - 2.20 2.66 97.80 4.98 ± 0.15 - 0.40 2.81 99.60 5   RK
9.89 ± 0.20 - 1.10 1.92 98.90 9.97 ± 0.17 - 0.30 1.6 99.70 10
14.90 ± 0.17 - 0.77 1.08 99.23 14.81± 0.13 - 1.30 0.81 98.70 15
19.30 ± 0.19 - 0.92 1.09 99.08 19.8 ± 0.20 - 0.79 0.96 99.21 20
19.90 ± 0.22 - 0.70 0.91 99.30 19.8 ± 0.16 - 1.00 0.76 99.00 20   CLPH
39.70 ± 0.16 - 0.70 0.38 99.29 39.7 ± 0.13 - 0.70 0.30 99.30 40
59.27 ± 0.1 - 1.21 0.15 98.79 59.5 ± 0.10 - 0.80 0.17 99.20 60
79.40 ± 0.14 - 0.80 0.16 99.20 79.10 ± 0.18 - 1.08 0.21 98.92 80
9.88 ± 0.23 - 1.24 2.23 98.76 9. 96 ± 0.12 - 0.39 1.1 99.61 10   PA
19.60 ± 0.17 -  2.01 0.82 97.99 19.90 ± 0.19 - 0.69 0.91 99.31 20
29.70 ± 0.16 -0.87 0.50 99.13 29.70 ± 0.14 - 0.89 0.44 99.11 30
39.70 ± 0.15 - 0.73 0.35 99.27 39.80 ± 0.13 - 0.62 0.30 99.38 40
14.80 ± 0.24 - 1.22 1.55 98.78 4.98 ± 0.15 - 0.79 1.41 99.21 15   AR
29.60 ± 0.18 -1.38 0.57 98.62 4.98 ± 0.15 - 1.03 0.47 98.97 30
44.60 ± 0.17 - 1.00 0.36 99.00 4.98 ± 0.15 -0.90 0.25 99.10 45
59.64 ± 0.20 -0.60 0.32 99.40 4.98 ± 0.15 - 0.68 0.25 99.32 60
n-number of determination, R.S.D. %, percentage relative standard deviation, Er%, percentage error.
a mean of five determination
b confidence limit at 95% confidence level and five degrees of freedom
Table 2: The intra-day and inter-day precision and accuracy of data obtained for determination of (Bu-HCl) by the proposed methods (n = 6)