. 2017 Dec 6;14(12):1524. doi: 10.3390/ijerph14121524

Table 6.

Quality of the groundwater in the vicinity of sample pig farms.

Time	Treatment		COD	NH₄⁺-N	NO₃⁻-N	TN	TP	Cu	Zn
Time	Treatment		(mg L⁻¹)
March	CK	Range	0	0–0.38	0.12–1.08	0.21–1.53	0	ND	ND
	CK	Mean	0	0.12	0.66	0.77	0	ND	ND
	T	Range	0	0.21–0.58	0.27–5.82	0.21–6.81	0.03–0.06	ND	0–0.01
	T	Mean	0	0.40	3.05	3.51	0.04	ND	0.005
June	CK	Range	0	0–0.44	0.37–2.08	0.12–2.41	0	ND	ND
	CK	Mean	0	0.16	1.25	1.12	0	ND	ND
	T	Range	0	0.09–1.33	2.40–18.2	1.62–19.3	0.07–0.11	ND	ND
	T	Mean	0	0.51	8.47	8.36	0.09	ND	ND
September	CK	Range	0	0.04–0.92	0.09–0.94	0.23–8.79	0.01–0.03	ND	ND
	CK	Mean	0	0.28	0.72	1.35	0.02	ND	ND
	T	Range	0	0.08–2.09	0.63–6.89	1.10–11.9	0.03–0.05	ND–0.008	0.007–0.013
	T	Mean	0	0.76	4.37	7.91	0.04	0.006	0.009
December	CK	Range	0	0–0.04	0.22–1.64	0.09–3.25	0	ND	ND
	CK	Mean	0	0.01	0.93	1.46	0	ND	ND
	T	Range	0	0–0.15	3.56–9.49	3.83–7.74	0.03–0.06	0.004–0.008	0.008–0.042
	T	Mean	0	0.06	5.78	5.44	0.04	0.005	0.019

ND: not detected.