Determination of the Selected Heavy Metal Content and Its Associated Health Risks in Selected Vegetables Marketed in Bahir Dar Town, Northwest Ethiopia

Table 3

Linear regression equations and the coefficient of determination (R²) of each heavy metal in the study area.

Element	The concentration of standards solution (mgL^−1)	Regression equation (Y = mx + b)	The correlation coefficient (R^2)	Wavelength (nm)
Pb	0.1, 0.2, 0.4, 0.6, and 0.8	Y = 0.0077x + 0.001	0.9995	283.3
Cr	0.05, 0.1, 0.2, 0.4, and 0.6	Y = 0.0102x + 0.001	0.9993	357.9
Cd	0.02, 0.1, 0.2, 0.4, and 0.6	Y = 0.0945x − 0.0008	0.9992	228.8
Cu	0.02, 0.25, 0.5, 1.0, and 1.5	Y = 0.0744x − 0.001	0.9997	324.7

Y = absorbance; x = concentration (mg/L) of Pb, Cr, Cd, and Cu at their corresponding wavelength; b = intercept.