River Pollution by Heavy Metals and Associated Impacts on the Adjacent Community, the Case of Holeta and Golli Rivers, Holeta Town, Ethiopia

Table 4

Calibration graph absorbance against the concentration of heavy metals in mg/L.

S.No.	Metal	Model for Absorbance vs. concentration	R^2
1	Zn	y = 0.3328x	0.9960
2	Cu	y = 0.0804x	0.9972
3	Mn	y = 0.0883x	0.9983
4	Cd	y = 0.1291x	0.9953
5	Cr	y = 0.0402x	0.9981
6	Pb	y = 0.0059x	0.9972
7	Ni	y = 0.0273x	0.9965
8	Co	y = 0.0198x	0.9976
9	Fe	y = 0.0163x	0.9986