Parameters Method A Method B Linear range(μg/mL) 15-97.5          2-22 limit of detection, LOD(μg/mL) 4.92 0.56 Limit of quantification, LOQ (μg/mL) 14.89 1.69 Slope 0.00705 0.0426     Intercept 0.01055 0.01944 Correlation coefficient( r) 0.99862 0.99971 Molar absorptivity Ɛ (L mol-1 cm-1 )        1.184x103 7.733x103 Sandell sensitivity 0.129 0.020

Table 2: Summary of quantitative parameters and statistical data using the proposed procedure.