PARAMETER METHOD-A METHOD-B     EPS HCZ EPS HCZ 1 Working λ 267.5 nm 271.5 nm 277 nm 271.5 nm 2 Beer’s law limit (μg/ml) 15-75 5-25 15-75 5-25 3 Correlation Coefficient (r2)* 0.9994 0.9996 0.9994 0.9996 4 Slope (m)* 0.0202 0.0704 0.0202 0.0704 5 Intercept (c)* 0.0424 -0.0084 0.0424 -0.0084 *Average of five determination

Table 1: Optical Characteristics and Linearity Data of EPS and HCZ.