Evaluation of the Karst Water Quality Upstream of Junhe River Basin in Shandong Province, China

摘要

Seventy nine karst water samples were used to study the quality of groundwater in upstream of Junhe River. The main hydrochemical types were HCO_3 type, HCO_3·SO_4 type, HCO_3·Cl type and Cl type, and the HCO_3 type occupied 58% of the total evaluation area. The sample points were grouped in the lower-left corner of the Piper picture, showing that the content of alkaline-earth metal ions exceeded that of alkali metal ions and weak acid ions exceeded the strong acid ions. The Schoeller picture demonstrated that the karst water originated from the same recharge source that was precipitation and the connectedness in the area was well. Groundwater comprehensive quality evaluation showed that most samples were at level IV. Karst water pollution in evaluation area was serious, and it was urgent to improve the quality of groundwater.