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《Journal of Agro-Environment Science》 2011-01
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Investigation on Nitrate Nitrogen Distribution Characteristics of Drinking Water in Lanzhou Rural Area,China

CHEN Yin-ping1,LUO Yong-qing1,TAO Ling1,LI Yu-qiang2(1.School of Environmental and Municipal Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China;2.Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences,Lanzhou 730000,China)  
The pollutant of nitrate-N(NO-3-N) plays an important role in water pollution nowadays.Analyzing the data of NO-3-N contents of rural drinking water from 98 plots around Lanzhou,we evaluated the water quality in comparison with the National Standard(GB 5749—2006),and investigated the correlation between NO-3 content and the EC.The results showed:①The mean NO-3-N content of drinking water was(5.42±6.63)mg·L-1 and the Rate of Qualification(RQ) was 86.73% in Lanzhou rural area.②The NO-3-N contents were not beyond the limit of the National Standard in Gaolan County,Xigu and Anning District;whereas overproof samples were observed in Yuzhong County,Qilihe,Yongdeng and Honggu District,in which the RQ was 77.27%,77.78%,80.00% and 83.33% respectively.③Significant differences of NO-3-N contents were detected on different types of water.The RQ was 100% in tap water,river water,and pool water,whereas the RQ was 92.00%,91.66%,and 55.56% in cellar water,deep well(more than 30 m) water,and spring water,respectively.The highest content of NO-3-N was detected in shallow well,which was(22.27±10.54) mg·L-1,and the RQ was 25.00%.④There was significantly positive correlation between EC value and NO-3-N content except for the pool and shallow well waters.⑤The significantly negative correlation was detected between pH value and NO-3-N content in shallow well water.⑥The nitrogen input in farmlands was significantly positively correlated with NO-3-N content in shallow well and spring waters.
【Fund】: 国家自然科学基金(31060060 40901049);; 兰州交通大学“青蓝”人才工程基金(QL-08-14A);; 兰州市科技计划资助项目(2008-1-175;2009-2-20)
【CateGory Index】: X832
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