Hydrogeochemical characteristics of karst groundwater in southern Nanchuan district of Chongqing
FAN Lianjie
PEI Jianguo
ZOU Shengzhang
DU Yuchao
LU Li
Abstract：This work focused on the karst groundwater in southern Nanchuan District of Chongqing city.We have analyzed hydrochemical components and trace heavy metals in 149 pieces of samples.The results indi-cate that the hydrochemical types of groundwater are dominated by HCO 3 - Ca · Mg ,HCO 3 - Ca and HCO 3 ·SO 4 -Ca.Most major chemical components of groundwater are Ca2 + ,Mg2 + ,HCO -3 and SO 2 -4 ,which show the corresponding relation with the water-bearing rock groups,i.e.carbonate karst water > carbonate rock and clastic rock water > clastic rock water.The ratio of Mg2 +/Ca2 + in underground water shows that the co-dissolution of calcium carbonate and dolomite is dominant in the groundwater runoff process.The con-tent of trace heavy metals is generally on the low side in groundwater.Most of the water quality is within the category III of water standard,only a few contaminated spots lead to some heavy metals on the high side.
Keywords：hydrochemical characteristicstrace heavy metalkarst groundwaterNanchuan district of Chongqing
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：7( 697-703 )