. 2015 Oct 5;8:541. doi: 10.1186/s13104-015-1376-5

Table 2.

Physico-chemical analysis of drinking water samples of different sources, Serbo town and its surroundings, 2012 (n = 90)

Parameters	Water sample sources
Parameters	Tap water		Protected well		Unprotected well	Protected spring		Unprotected spring			P- value
Temp (⁰C)		Mean	24.42	24.53		22.79	23.52		23.37	0.34
		SD	1.15	1.23		1.03	1.93		2.16
		%CV	4.7	5.03		4.52	8.23		9.24
pH		Mean	7.85	6.8		6.48	6.25		6.18	0
		SD	0.22	0.56		0.22	0.34		0.37
		%CV	2.8	8.24		3.47	5.39		5.98
EC		Mean	366.93	366.95		134.8	56.24		46.42	0
(μS/cm)		SD	5.24	262.65		126.41	19.98		15.59
		%CV	1.43	71.58		93.77	35.52		33.59
Turbidity (NTU)		Mean	1.87	3.78		24.22	10.64		14.59	0.03
		SD	0.43	5.78		20.45	5.68		10.06
		%CV	22.99	152.81		84.45	53.37		68.97
DO(mg/l)		Mean	3.96	4		3.53	5.3		5.9	0.26
		SD	1	0.94		0.83	0.36		3.61
		%CV	25.17	23.46		23.62	6.83		61.22
PO₄3^- (mg/l)		Mean	1.21	0.29		0.56	0.77		0.76	0.03
		SD	0.38	0.12		0.42	0.26		0.55
		%CV	31.27	40.06		74.63	33.64		72.02
NO₃- (mg/l)		Mean	1.92	42.39		8.48	5.6		2.55	0.09
		SD	0.26	37.99		10.43	4.44		1.3
		%CV	13.39	89.62		123.05	79.28		50.78
TSS (mg/l)		Mean	5.93	83.01		66.33	23.47		101.08	0.25
		SD	2.25	112.76		25.9	10.08		97.24
		%CV	37.94	135.85		39.05	42.97		96.19
TDS(mg/l)		Mean	524.73	415.13		348.17	327.33		137.19	0
		SD	51.25	175.37		49.57	101.86		18.98
		%CV	9.77	42.24		14.24	31.12		13.83
BOD(mg/l)		Mean	9.8	34.67		62.89	22.93		35.33	0
		SD	1.21	7.15		11.93	1.98		9.43
		%CV	12.32	20.61		18.97	8.64		26.69

EC electric conductivity, DO dissolved oxygen, ND not detected, TSS total suspended substances, TDS total dissolved substances, BOD biological oxygen demand