Table 1: Regression and analytical parameters.

ParameterProposed method

, nm580
Beer’s law limits ( g mL−1) 5.0–90.0
Molar absorptivity (L mol−1 cm−1)3.3 × 103
Sandell sensitivity* ( g cm−2)0.0872
Limit of detection ( g mL−1)1.26
Limit of quantification ( g mL−1)3.81
Regression equation, ** Intercept, ( )−0.0101
Slope, ( )0.0117
Correlation coefficient ( )0.9994
Standard deviation of intercept ( )0.0098
Standard deviation of slope ( )0.0002

*Limit of determination as the weight in µg per mL of solution, which corresponds to an absorbance of A = 0.001 measured in a cuvette of cross-sectional area 1 cm2 and l = 1 cm. ** , where is the absorbance, a is the intercept, b is the slope, and is the concentration in g mL−1.