An application of Water Quality Index (WQI) and multivariate statistics to evaluate the water quality around Maddhapara Granite Mining Industrial Area, Dinajpur, Bangladesh

Environmental Systems Research

Table 6 Physico-chemical parameters of different clustered groups

	P^H	EC	Turbidity	TA	TH	Ca²⁺	Mg²⁺	Na⁺	K⁺	As³⁺	Cd²⁺
Cluster I
Min	5.3	41	3	5	2.5	1.3	1	2.1	0.4	0	0.0008
Max	9.02	194	45	74	43	28	41	53	5.72	0.0017	0.0033
Mean	7.42	98.28	12.26	24.70	15.05	9.78	9.15	11.55	2.05	0.001	0.0018
Cluster II
Min	6.6	188	4	14	17.5	9.4	5	15.5	3.44	0	0.0009
Max	8.38	587	10	88	87.5	51	36.5	37.9	12.2	0.0016	0.0042
Mean	7.65	274.71	6.71	38.86	41.25	26.7	14.55	22.73	6.18	0.001	0.0027
Cluster III
Min	8.03	380	4	59	70	51	15	19.7	5.72	0.0011	0.0032
Max	8.13	587	8	88	87.5	55	36.5	37.9	12.2	0.0014	0.0039
Mean	8.08	483.5	6	73.5	78.75	53	25.75	28.8	8.96	0.00125	0.0036

	Fe³⁺	Zn²⁺	Cr³⁺	\({\text{SO}}_{4}^{{2{ - }}}\)	\({\text{PO}}_{4}^{3 - }\)	SiO₂	NO₃ ⁻	Cl⁻	NH₄ ⁺	TDS	\({\text{CO}}_{3}^{2 - }\)
Cluster I
Min	0.09	0.08	0	0.08	0.08	11.9	0.07	0.71	0.22	24	4.3
Max	0.92	0.23	0.015	2	0.64	53.84	0.63	15.76	1.07	135.8	13.6
Mean	0.34	0.13	0.002	0.39	0.32	28.25	0.31	4.52	0.68	71.49	8.39
Cluster II
Min	0.16	0.1	0.0014	0.16	0.27	12.85	0.24	6.39	0.38	141.4	7.85
Max	0.52	0.3	0.005	10	2.3	35.9	0.71	73.84	0.92	382	18
Mean	0.34	0.2	0.002	2.43	1.04	29.51	0.47	26.57	0.70	190.01	11.71
Cluster III
Min	0.24	0.3	0.0023	0.55	0.37	32.45	0.41	13.49	0.84	247	15
Max	0.52	0.32	0.003	1.52	0.52	37.15	0.45	73.84	1.04	382	18
Mean	0.38	0.31	0.00265	1.035	0.445	34.8	0.43	43.665	0.94	314.5	16.5