标题：Comparison of the Water Quality of Two Aquifers Established in Different Development Zones of Mexico Authors: Esperanza Robles, Elizabeth Ramirez, Blanca Martinez, Maria de Guadalupe Sainz and Maria Elena Gonzalez
期刊名称：Universal Journal of Environmental Research and Technology
电子版ISSN：2249-0256
出版年度：2011
卷号：1
期号：2
出版社：Euresian Publications
摘要：The rapid growth of urban areas has further affected groundwater quality due to over-exploitation of resources and improper waste disposal practices. The over-exploitation of aquifers, which reduces natural recharge due to high urbanization and anthropogenic activities, has caused a decrease in groundwater quality in many areas. The objective of this research was to determine and compare the bacteriological and physicochemical quality of the Mexico City and Tepalcingo-Axochiapan, Morelos aquifers. Groundwater samples were collected every two months for one year. The bacteriological and physicochemical parameters were analyzed in accordance with Standard Methods for the Examination of Water and Wastewater. The Tepalcingo-Axochiapan, Morelos aquifer had higher concentrations of total and fecal coliforms in most wells and samplings than the Mexico City aquifer. Fecal coliform values of the two aquifers were lower than the maximum permissible limit indicated in the Mexican Ecological Criteria of Water Quality (1000 colony forming units (CFU)/100 ml of fecal coliforms) for public supply sources. Average values of electrical conductivity and dissolved solids in the Tepalcingo-Axochiapan aquifer were higher than average values from the Mexico City aquifer. ANOVA analysis showed significant differences (p < 0.05) only for hardness and sulfates, they were the physicochemical parameters that showed the biggest difference between the two aquifers, the concentrations of both parameters being higher in the Tepalcingo-Axochiapan aquifer than in the Mexico City aquifer. In general, the average values of the physicochemical parameters were below the maximum permissible limits indicated in the Mexican Official Norm (NOM-127-SSA1-1994) for drinking water.
