Inferred Industrial and Agricultural Activities Impact on Groundwater Quality of Skhira Coastal Phreatic Aquifer in Southeast of Tunisia (Mediterranean Region)

Table 6

Water quality of the Skhira aquifer with respect to WHO standards [44] and Tunisian standards [45].

Parameters	WHO (2011)	NT.09.14 (2012)	Number of samples exceeding the recommended value		% of samples exceeding the recommended value
			WHO	NT.09.14	WHO	NT.09.14
T°C	—	25	—	0	—	0
pH	6.5 to 8.5	6.5 to 8.5	1	1	5	5
EC (μS/cm)	1500	1500	20	20	100	100
Na (mg/L)	200	—	20	—	100	—
Cl (mg/L)	250	600	20	20	100	100
K (mg/L)	30	—	2	—	10	—
Ca (mg/L)	200	300	20	20	100	100
Mg (mg/L)	150	150	20	20	100	100
HCO3 (mg/L)	380	—	1	—	5	—
SO4 (mg/L)	250	600	20	20	100	100
NO3 (mg/L)	45	45	13	13	65	65
NO2 (mg/L)	3	3	0	0	0	0
F (mg/L)	1.5	1.7	6	6	30	30
Al (mg/L)	0.2	0.2			0	0
Zn (mg/L)	3	3	0	0	0	0