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- W2385428728 abstract "The hydrochemical indicators [pH,electrical conductivity(EC),HCO-3,Ca2+,SO2-4,Mg2+,NO-2 and NO-3] of the underground water in a karst valley in Qingmuguan,Chongqing was monitored for 7-12 months,and the hydrochemical characters were found to be different in their temporal and spatial distribution.Some factors,such as EC,HCO-3,Ca2+,Mg2+ and NO-3,increased from the upstream to the downstream,while pH and SO2-4 decreased.Compared with the data at D1(the inlet),EC,HCO-3,Ca2+ and Mg2+ increased by 100 μS/cm,1.5 mmoll/L,17 mg/L and 5.1 mg/L,respectively,at S2(the outlet),and the concentration of NO-3 at S2 was 6.4 times that at D1.In contrast,pH and SO2-4 concentration showed an opposite trend,being 0.16 and 26 mg/L lower at D1 than at S2.The underground water hydrochemistry differed in different seasons,pH,EC,HCO-3,Ca2+ and SO2-4 showed significant seasonal variations,being higher in winter and spring than in summer and fall.NO-3 and NO-2 showed a sharp increase followed by a decrease in June and July.It is concluded from an analysis of these monitoring data that the major influencing factors are geological background,precipitation dilution,different underground water recharge,karstification and agriculture activities." @default.
- W2385428728 created "2016-06-24" @default.
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- W2385428728 date "2009-01-01" @default.
- W2385428728 modified "2023-09-24" @default.
- W2385428728 title "Temporal and Spatial Distribution of Underground Water Hydrochemistry and Its Influencing Factors in Typical Karst Valleys——A Case Study of Qingmuguan Underground Water System in Chongqing" @default.
- W2385428728 hasPublicationYear "2009" @default.
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