Influence of Urbanization on Groundwater Chemistry at Lanzhou Valley Basin in China

With the rapid development of economy, urbanization and industrialization gradually become an important driving force groundwater chemical evolution. In this study, Lanzhou City, which is one biggest industrial cities in northwest China, was selected to investigate impacts city on quality. Several hydrochemical methods together with principal component analysis (PCA) were used for hydrochemistry evolution characteristics sensitive factors chemistry different urban functional areas City. The results show that 96% study area cannot meet quality standards China. main affecting are SO42?, TDS, total hardness, Mg2+ Na+. Urbanization lead further deterioration already naturally high TDS groundwater. NO3?, Cl? NH4+ characteristic human input sources commercial residential areas; Fe NO3? new urban-rural junction; Cl?, Total Fe, Mn2+, F?, I?, Pb2+, Cr6+ As3+ areas. Domestic sewage infiltration manure Nitrate fertilizer irrigation leading increase nitrate nitrogen area. Industrial wastewater leakage organic pollution promote dissolution minerals aquifer (the fluorine-containing reductive iron manganese oxides) petrochemical