Table 1: Optical characteristics, precision, and accuracy data.

ParametersBTB (A)BPB (B)BCG (C) I2 (D)KMnO4 (E)

(nm)412.00414.00415.00366.00610.00
Beer’s law limit (μg mL−1)2.5–252.5–252.0–25 5–5012.5–150
Sandell’s sensitivity (μg cm−2)0.030.050.010.020.35
Slope (specific absorptivity), 0.030.020.010.060.05
Intercept ( )0.160.050.060.010.03
Correlation coefficient ( )1.001.001.001.001.00
Standard deviation of intercepts (% )0.020.010.010.060.01
Limit of detection, μg mL−12.121.652.583.5311.30
Limit of quantification, μg mL−1 6.374.957.7410.6034.10
Regression equation

, where is the concentration in μg mL−1.