Dyes Taken
(µg mL–1)
Found
(µg mL–1)
Recovery
(%)
RSD a
(%)
RE
(%)
Confidence b
Limits
BPB 3.00 3.01 100.33 1.621 1.169 3.01 ± 0.035
5.00 5.02 100.04 0.694 0.940 5.02 ±  0.047
7.00 6.97 99.57 0.319 0.425 6.97 ± 0.030
BCG 2.00 2.017 100.85 1.134 1.081 2.02 ± 0.022
3.50 3.51 100.29 1.288 1.228 3.51 ± 0.043
5.00 5.02 100.40 0.748 0.713 5.02 ± 0.036
BTB 2.00 2.02 100.10 1.460 1.391 2.02 ± 0.028
4.00 4.01 100.25 1.494 0.426 4.01± 0.057
6.00 5.97 99.50 0.671 0.639 5.97± 0.038
BCP 2.00 2.03 101.50 0.507 0.483 2.03 ± 0.010
4.00 4.07 101.75 0.902 0.859 4.07 ± 0.035
6.00 6.05 100.83 0.732 0.698 6.05 ± 0.042
aRelative standard deviation for six determinations
b95% confi dence limits and fi ve degrees of freedom Table 2: Evaluation of the accuracy and precision of the proposed procedures.