Table 1 Statistical summary of environmental indicators of river water quality in the Chu-Talas Basin during periods of low river flow (L, n = 30) and high river flow (H, n = 30).

Indicators	Period	Minimum	Maximum	Mean	Median	SD	SE
Ca (mg L⁻¹)	L	10.27	63.75	29.41	24.16	12.93	2.36
Ca (mg L⁻¹)	H	9.66	59.65	26.66	22.36	12.33	2.25
Mg (mg L⁻¹)	L	1.10	22.42	7.05	5.15	5.28	0.96
Mg (mg L⁻¹)	H	0.75	24.64	6.30	4.23	5.15	0.94
K (mg L⁻¹)	L	0.62	2.24	1.34	1.23	0.46	0.08
K (mg L⁻¹)	H	0.54	2.35	1.15	1.06	0.45	0.08
Na (mg L⁻¹)	L	0.40	15.43	4.25	2.78	3.98	0.73
Na (mg L⁻¹)	H	0.37	15.46	3.27	1.66	3.90	0.71
HCO₃ (mg L⁻¹)	L	43.97	311.40	156.31	140.19	66.75	12.19
HCO₃ (mg L⁻¹)	H	56.75	284.28	143.58	128.09	65.27	11.92
SO₄ (mg L⁻¹)	L	4.77	79.38	24.95	22.22	17.10	3.12
SO₄ (mg L⁻¹)	H	4.02	41.80	19.81	16.90	11.49	2.10
Cl (mg L⁻¹)	L	0.48	12.77	2.25	1.37	2.61	0.48
Cl (mg L⁻¹)	H	0.25	12.61	1.80	0.75	2.73	0.50
NO₃ (mg L⁻¹)	L	2.19	6.92	3.73	3.57	1.22	0.22
NO₃ (mg L⁻¹)	H	1.17	6.12	2.84	2.68	1.10	0.20
pH	L	7.33	8.84	8.24	8.47	0.55	0.10
pH	H	7.14	8.99	8.58	8.73	0.42	0.08
EC (μS cm⁻¹)	L	65.00	521.90	213.22	193.30	102.23	18.66
EC (μS cm⁻¹)	H	36.00	542.00	195.93	145.15	132.92	24.27
TDS (mg L⁻¹)	L	80.21	474.79	229.74	194.72	100.59	18.37
TDS (mg L⁻¹)	H	76.11	414.84	205.76	171.61	94.10	17.18
Pb (μg L⁻¹)	L	0.046	2.976	0.929	0.710	0.782	0.143
Pb (μg L⁻¹)	H	0.054	4.655	1.096	0.665	1.175	0.215
Zn (μg L⁻¹)	L	1.104	9.855	4.972	5.097	2.250	0.411
Zn (μg L⁻¹)	H	0.950	22.664	5.047	3.106	5.150	0.940
Cu (μg L⁻¹)	L	0.376	9.570	2.298	1.792	2.217	0.405
Cu (μg L⁻¹)	H	0.154	11.853	2.210	1.023	3.113	0.568
Cr (mg L⁻¹)	L	0.020	0.060	0.034	0.030	0.009	0.002
Cr (mg L⁻¹)	H	0.020	0.080	0.037	0.040	0.012	0.002
As (μg L⁻¹)	L	0.323	3.417	1.335	0.878	1.020	0.186
As (μg L⁻¹)	H	0.271	3.316	1.258	0.904	0.996	0.182

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