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

Table 1

Water samples, materials used to sample, and laboratory techniques.

Gw samples	Materials used to sample	Laboratory techniques/apparatus	Purpose
7 Gw samples labelled as; (i) Wtx; (ii) Whr; (iii) Wm; (iv) Wmd; (v) Wmt; (vi) Wsw and; (vii) Wkr	(i) 2 polypropylene bottles; (ii) Icebox and refrigerator to preserve samples; (iii) GPS to record the geographic coordinate	EDTA titration	For total hardness and calcium hardness measurements
		Silver nitrate titration	For chloride concentration measurement
		UV.VIS. spectrophotometer	To read the sulphate absorbance of samples
		Hach DR 2800^TM spectrophotometer	For nitrate measurement
		Model 2655–10 dual-channel flame photometer	To measure directly the K^+ and Na^+ concentration