Geochemical and Geophysical Study in a Degraded Area Used for Disposal of Sludge from a Water Treatment Plant

Table 2

Results of the chemical analysis of samples taken every three meters from the drilling wells.

			Upstream well (𝑛=10)		Downstream well (𝑛=10)		WTS well (𝑛=10)		Schellmann benchmarks (1980)
Parameters	Unit	Limit of detection	Average	Standard deviation	Average	Standard deviation	Average	Standard deviation	Shale (𝑛=74)	Sandstones (𝑛=23)
Organic C	mg/kg	0.06	1,030	900	800	1130	7,830	16,420
Organic matter	g/kg	0.1	1.76	1.51	1.38	1.94	13.51	28.34
CEC	cmolc/kg	0.02	2.46	0.38	2.30	0.30	3.09	2.80
Caexchangeable	cmolc/kg	0.01	0.1311	0.2769	0.2551	0.6158	0.7648	1.8697
Mgexchangeable	cmolc/kg	0.01	0.2692	0.1634	0.2976	0.1720	0.3288	0.1708
Naexchangeable	cmolc/kg	0.0004	0.0019	0.0039	0.0027	0.0071	0.0080	0.0234
Kexchangeable	cmolc/kg	0.0004	0.0916	0.0334	0.0953	0.0319	0.0882	0.0222
Potential acidity	cmolc/kg	0.05	1.97	0.47	1.65	0.64	1.90	0.74
Alexchangeable	cmolc/kg	0.05	0.5944	0.2814	0.4165	0.1899	0.4368	0.1829
pH			6.09	0.11	5.70	0.08	5.50	0.31
Al2O3	mg of Al2O3/kg	529	191,000	40,300	166,820	32,964	174,640	32,075	269,000	106,000
CaO	mg of CaO/kg	112	2,500	1,100	2,930	678	1,560	795	1,200	1,100
TiO2	mg of TiO2/kg	28	13,000	3,000	10,780	2,195	9,490	1,208	13,600	8,200
Na	mg of Na/kg	4	213	233	130	22	183	167	1,400	3,560
Mn	mg of Mn/kg	0.03	42.69	15.84	498.77	302.17	235.97	103.28	540	1,630
Fe2O3	mg of Fe2O3/kg	41	104,500	72,800	133,530	50,492	93,910	19,093	197,000	163,000
SiO2	mg of SiO2/kg	169	579,700	142,900	580,000	127,387	584,150	145,370	392,000	637,000
MgO	mg of MgO/kg	166	4,200	1,900	8,590	2,818	2,730	988	2,500	2,600
Co	mg of Co/kg	1.1	6.81	6.53	15.68	8.76	14.07	5.34	13	38
K	mg of K/kg	4	23,215	19,724	30,853	22,694	18,497	12,138	3,490	4,650
Cu	mg of Cu/kg	0.097	25.30	18.40	27.36	7.20	16.93	5.11	40	37
Zn	mg of Zn/kg	0.43	32.59	16.69	54.03	18.75	43.42	7.67	25	10
Ba	mg of Ba/kg	0.13	166.09	37.19	264.71	81.20	162.12	28.94	122	295
Pb	mg of Pb/kg	1	29.22	11.28	22.55	9.17	13.43	10.70	38	48
Y	mg of Y/kg	0.22	21.27	3.92	19.10	3.06	20.04	2.10	21	12
Sr	mg of Sr/kg	0.99	44.19	27.30	47.80	5.98	36.39	12.01	34	26
Pavailable	mg of P/kg	0.002	0.52	0.34	1.54	0.94	7.42	20.41
Znavailable	mg of Zn/kg	0.43	0.33	0.55	0.31	0.32	0.59	1.05
Mnavailable	mg of Mn/kg	0.03	1.17	1.44	1.97	2.08	15.94	44.80
Cuavailable	mg of Cu/kg	0.097	0.49	0.42	0.50	0.16	0.40	0.09
Pbavailable	mg of Pb/kg	0.01	2.07	0.32	1.47	0.30	2.29	0.70
Be	mg of Be/kg	0.74	1.40	0.45	2.30	0.55	2.12	0.53
Mnavailable/Mn	%		2.44	1.72	0.99	2.24	3.66	8.69
Cuavailable/Cu	%		2.68	2.93	1.99	0.95	2.55	1.00
Pbavailable/Pb	%		8.24	3.73	7.69	3.48	29.84	19.70
Znavailable/Zn	%		0.88	0.97	0.70	0.76	1.47	2.71