《Table 3 The pH Distribution of the Groundwater Samples in the Fangchenggang Area》

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《广西防城港地区地下水现场测试数据集》

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It is shown from the groundwater survey that the groundwater in the Area is obviously slightly acidic with a low pH value（Table 3）.The average，minimal and maximum pH values of the groundwater in the wet seasons are 6.21，4.29 and 7.91 respectively.Moreover，the pH values of 46.11%，17.10%and 36.79%of the groundwater samples are 5.50–6.50，4.29–5.50and 6.50–7.91 respectively.The average，minimal and maximum pH values of the groundwater in the dry seasons are 5.84，4.12 and 7.97 respectively.Additionally，the pH values of 56.15%，30.77%and 13.08%of the groundwater samples are 5.50–6.50，4.12–5.50 and 6.50–7.97respectively.The groundwater in the Area is mainly slightly acidic with a pH value ranging from 5.50 to 6.50 as it is affected by rainfall，media in the aeration zone，hydrolysis of sulfurbearing minerals and tidal effects.