Assessment of Heavy Metals Concentration in Arsenic Contaminated Groundwater of the Chaco Plain, Argentina

Table 2

Statistical summary of the chemistry of groundwater (major ions and trace elements; 𝑛=45) from Comandante Fernández Department, Chaco, Northeast Argentina.

Parameter	Mean	Median	Range	10th percentil	90th percentil	Standard deviation
Depth (m)	22.0	13.0	5.00–220	8.00	50.0	33.1
pH	7.54	7.51	6.50–8.94	6.90	8.22	0.55
EC (mS/cm)	5.27	2.50	0.69–24.9	0.99	13.4	6.28
HCO3^− (mg L^−1)	699	679	135–1868	299	974	376
Cl^− (mg L^−1)	1082	269	14.4–8193	50.1	3835	1832
SO4^2− (mg L^−1)	570	209	18.0–3485	43.9	1514	789
NO3^− (mg L^−1)	29.7	14	bdl–200	0.03	53.4	36.1
F (mg L^−1)	1.29	1.00	0.10–4.20	0.30	3.08	1.10
Na^+ (mg L^−1)	875	644	132–5857	214	1907	989
K^+ (mg L^−1)	23.6	18.4	2.10–110	6.96	56.3	21.5
Ca^2+ (mg L^−1)	101	28.5	1.40–1100	5.33	274	191
Mg^2+ (mg L^−1)	53.7	20.3	0.52–400	2.20	149	76.2
S (mg L^−1)	49.3	0.57	0.006–724	0.06	125	130
P (mg L^−1)	2.70	0.8	0.17–22.9	0.30	8.26	4.41
As (µg L^−1)	213	100	7–1990	17.0	500	347
Al (µg L^−1)	561	99.0	60.0–17380	60.0	257	2601
Ba (µg L^−1)	122	14.0	bdl–1400	2.00	135	211
B (µg L^−1)	4020	1970	156–21910	283	7896	5599
Cd (µg L^−1)	2.00	2.00	bdl–7.0	1.00	4.00	1.40
Cu (µg L^−1)	23.0	6.00	bdl–280	0.10	65.8	48.7
Co (µg L^−1)	27.2	3.00	bdl–280	1.40	82.6	6.20
Fe ( µg L^−1)	276	81.0	bdl–2000	0.10	716	396
Mn (µg L^−1)	152	5.00	bdl–3740	0.10	327	574
Mo (µg L^−1)	23.9	21.0	bdl–160	3.00	42.0	30.8
Si (µg L^−1)	1057	150	bdl–16570	0.40	2415	2803
Sr (µg L^−1)	449	86	2.00–4871	15.0	873	873
Se (µg L^−1)	1.9	1.00	bdl–10.0	0.1	6.60	2.70
Sb (µg L^−1)	5.4	1.00	bdl–111	0.10	9.00	1.7
Ni (µg L^−1)	0.9	0.10	bdl–10.0	0.10	3.00	1.90
V (µg L^−1)	204	76.0	bdl–2646	11.4	416	431
Zn (µg L^−1)	83.8	3.00	bdl–2813	0.10	67.0	487