
Parameters  BTB (A)  BPB (B)  BCG (C)  I_{2} (D)  KMnO_{4} (E) 

(nm)  412.00  414.00  415.00  366.00  610.00 
Beer’s law limit (μg mL^{−1})  2.5–25  2.5–25  2.0–25  5–50  12.5–150 
Sandell’s sensitivity (μg cm^{−2})  0.03  0.05  0.01  0.02  0.35 
Slope (specific absorptivity),  0.03  0.02  0.01  0.06  0.05 
Intercept ()  0.16  0.05  0.06  0.01  0.03 
Correlation coefficient ()  1.00  1.00  1.00  1.00  1.00 
Standard deviation of intercepts (% )  0.02  0.01  0.01  0.06  0.01 
Limit of detection, μg mL^{−1}  2.12  1.65  2.58  3.53  11.30 
Limit of quantification, μg mL^{−1 }  6.37  4.95  7.74  10.60  34.10 
Regression equation      
