

^{a}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 cm^{2} and l=1 cm. y^{b} =a+bx, where y is the absorbance, x is concentration in μg/mL, a is intercept and b is slope.  
Table 1: System Suitability Parameters of MET and DAB. 