Hydrogeochemical and GIS Analysis of Groundwater Quality for Drinking and Irrigation Purposes in Kuzhithuraiyar Sub-Basin, Kanniyakumari District, Tamil Nadu, India

Table 1

pH, EC, TDS, and cation and anion concentration of groundwater samples of Kuzhithuraiyar sub-basin.

Parameter	Desirable limit	Postmonsoon		Premonsoon		Postmonsoon samples (%)		Premonsoon samples (%)
		Min	Max	Min	Max	Within limit	Exceeding limit	Within limit	Exceeding limit
pH	6.5–8.5	6.9	8.5	6.5	8.5	100	—	100
EC	300 μS/cm	39.06	1523.44	37.5	1996.88	71	29	54	46
TDS	500 mg/L	25	975	24	1278	90	10	85	15
Ca	75 mg/L	2	104	2	92	98	2	94	6
Mg	30 mg/L	1.22	43.74	1.22	58.32	98	2	90	10
Na	200 mg/L	2	230	3	317	92	8	92	8
K	10 mg/L	0.1	38	1	37	77	23	86	14
Cl	250 mg/L	4	411	4	624	92	8	90	10
SO4	200 mg/L	1	72	1	77	100	—	100	—
CO3	—	0	1.47	0	4.33
HCO3	—	4.98	317.2	4.97	366	—	—	—
NO3	45 mg/L	0.1	23	0.05	18	100	—	100
F	1.0 mg/L	0.05	0.76	0.05	0.86	100	—	100