| We investigated geochemical susceptivity of groundwater in representative karst groundwater system. The results indicated that Ca2+ and Mg2+, correlative the average values of geochemical susceptivity index (GSI) were 0.73 and 0.19; HCO-3 and SO2-4, interrelated the average values of geochemical susceptivity index were 0.92 and 0.37, are the principal cations and anions in karstic groundwater system, respectively. And the major elements are obviously characterized by the geochemical susceptivity. The rank order of geochemical susceptivity for major elements in study region is HCO-3>Ca2+>SO2-4>Mg2+>Cl->Na+ >NO-3>K+ . The susceptive regions of groundwater system were zoned by the geochemical susceptivity index of HCO-3 (GSIHCO3-), which classified as GSIHCO3-<0.5 is low-susceptivity zone, 0.5HCO3-<1 is moderate-susceptivity zone and GSIHCO3->1 is high-susceptivity zone, respectively. The groundwater systems in high-susceptivity zone may become as a collected and genetic room for pollutants. Furthermore, both continual or active exchange and mutual recharge between surface water and groundwater in high-susceptivity zones might induce intersectant pollution and serious cycle. |
