Hydrogeochemical Features and Genesis of Confined Groundwater and Health Perspectives for Sustainable Development in Urban Hengshui, North China Plain

Figure 9

Scatter plots of (a) chloro-alkaline indices CAI-1 versus CAI-2 and (b) Na⁺+K⁺−Cl^- versus Ca²⁺+Mg²⁺−HCO₃⁻−SO₄^2-.

(a)

(b)