The Secret of the Main Campus Water-Wells, Arba Minch University, Ethiopia

Table 9

Sulphate concentration from the standard graph line and the absorbance value.

Sampled wells	Absorbance (420 nm)	Concentration (SO4^2− mg/L)
Wtx	0.210	18.444
Whr	0.290	27.333
Wsw	0.291	27.444
Wmt	0.277	25.889
Wkr	0.298	28.222
Wmd	0.323	31.000
Wmg	0.316	30.222