Groundwater Quality Evaluation for Potable Use and Associated Human Health Risk in Gaobeidian City, North China Plain

Table 3

Entropy weight of hydrochemical parameters.

Item	Na^+	Cl^−	SO4^2−	F^−	NO3^−	NO2^−	Fe	As
Information entropy, ej	0.889	0.849	0.867	0.829	0.772	0.525	0.582	0.531
Entropy weight,	0.028	0.038	0.033	0.043	0.057	0.119	0.105	0.118
Item	Mn	Cr^6+	I^–	TH	NO3^–-N	NO2^–-N	TDS
Information entropy, ej	0.746	0.585	0.861	0.955	0.679	0.372	0.971
Entropy weight,	0.064	0.104	0.035	0.011	0.080	0.158	0.007