Impact Assessment of Phosphogypsum Leachate on Groundwater of Sfax-Agareb (Southeast of Tunisia): Using Geochemical and Isotopic Investigation

Table 1

Chemical composition of groundwater samples

Months	Unit	Oct 13		Jan 14		Mar 14		May 14		Aug 14		Oct 14
Parameters		Min	Max	Min	Max	Min	Max	Min	Max	Min	Max	Min	Max
	°C	12.1	13.9	10.1	12.8	11	11.7	11.10	12.20	12.2	13.2	12.00	13.1
pH	mg/L	5.18	7.74	5.75	8.1	5.58	7.95	5.56	7.85	5.2	7.79	5.50	7.76
O2dissolved	mg/L	0.9	2.15	0.9	4.2	0.8	3.5	0.80	3.12	0.7	2.9	0.50	2.8
EC	µs/cm	2100	33200	1590	33000	1650	32600	1680	34300	1800	34700	1900	34900
K^+	mg/L	2.7	22.70	2.25	19	2.15	19.6	2.60	19.50	2.5	21.2	2.7	23.68
Na^+	mg/L	111.5	6965	139.4	6760	142	6300	115.16	6124	198	6600	195	6515
Ca^2+	mg/L	59	986	49	904	50	851	54.36	1075	51	1080	58	1020
Mg^2+	mg/L	37	945	22.5	920	24	940	29.75	1085	25	1050	35	1080
Cl^-	mg/L	110.6	5480	104.3	5396	101	5372.5	151	5475	135.5	5810	112	5632.5
	mg/L	256.4	9143.9	195.2	9661.5	271	9533.9	199.20	8533.9	245	9313.9	255	9973
	mg/L	215	4396.1	201.5	4295.7	204	4352.9	261.25	4543.7	210	4857.3	210	4948.5
Ortho-P	mg/L	2.15	67.3	2.5	81.7	2.7	71.00	1.90	136.65	1.5	92	1.25	114.95
	mg/L	0.6	26	0.6	27	0.50	19.00	0.50	29.00	0.5	17	0.6	19
Al	mg/L	0.02	1.8	0.03	1.57	0.03	0.90	0.06	0.98	0.02	0.96	0.03	0.97
Zn	mg/L	0.03	1.46	0.02	1.41	0.02	1.44	0.03	1.47	0.04	1.51	0.03	1.05