Table 1 Summary of pH, TH, TDS and ORP data for surface water samples from different townships in the Longzi County.

Township	Number of samples	pH			TH (mg L⁻¹)			TDS (mg L⁻¹)			ORP (mV)
Township	Number of samples	Mean	Range	SD^a	Mean	Range	SD^a	Mean	Range	SD^a	Mean	Range	SD^a
Longzi	3	7.38	6.63–7.78	0.57	210.38	164.3–260.2	48.09	216.94	170.0–267.0	48.58	246.67	210–272	32.52
Ridang	11	7.27	6.73–7.66	0.28	141.03	35.2–321.5	76.43	172.54	46.0–473.0	133.77	287.18	228–393	44.03
Liemai	6	7.50	7.06–8.07	0.35	438.42	340.6–510.8	72.17	372.06	305.0–447.0	57.35	205.67	187–243	20.41
Rerong	4	7.39	7.01–7.72	0.36	333.5	195.8–528.3	141.73	314.43	175.7–454.0	114.35	266.00	248–302	24.43
San’anqulin	8	7.30	6.93–7.77	0.25	213.06	92.5–293.5	59.86	217.88	96.0–277.0	58.23	166.88	110–228	37.19
Zhunba	7	7.59	7.44–7.75	0.12	225.25	96.2–365.3	99.12	234.86	115.0–337.0	83.69	158.86	101–266	54.17
Xuesa	9	7.55	6.96–8.04	0.37	308.36	65.1–489.9	141.25	280.59	80.0–387.7	110.09	213.33	166–280	31.95
Zhari	19	7.32	6.81–7.91	0.26	54.03	15.6–86.9	22.69	64.21	18.0–103.0	24.77	90.89	43–133	24.66
Yumai	17	7.22	6.61–7.83	0.34	60.49	9.0–281.4	63.05	71.29	14.0–266.0	59.29	76.53	42–112	20.31
Jiayu	12	7.55	7.25–8.03	0.20	315.67	181.5–484.3	110.98	265.34	184.0–364.0	69.46	164.13	137–217	24.42
Douyu	8	7.75	7.44–7.96	0.20	228.56	143.8–346	56.43	260.75	172.0–371.0	58.00	212.83	161–289	34.26
Non-KBD areas	68	7.49	6.88–8.07	0.30	262.06	35.2–528.3	123.29	253.25	46.0–473.0	100.39	215.90	151–343	55.99
KBD areas	36	7.27	6.61–7.91	0.30	57.08	9.0–281.4	45.74	67.56	14.0–266.0	44.00	84.11	42–133	23.55
Whole county	104	7.41	6.61–8.07	0.32	191.1	9.0–528.3	142.13	188.97	14.0–473.0	122.86	204.89	42–393	77.32

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