Research Article
Multivariate Analysis of Confined Groundwater Hydrochemistry of a Long-Exploited Sedimentary Basin in Northwest China
Figure 6
Plots of (a) Na+ versus , (b) Ca2+ against , (c) Ca2+ + Mg2+ against , and (d) Ca2+ versus (mmol/L).
| (a) |
| (b) |
| (c) |
| (d) |