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时间:2020-03-24
《兰州市农村饮用水中硝态氮分布特征及评价.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、农业环境科学学报2011,30(1):183—189JournalofAgro—EnvironmentScience陈银.萍1,罗永清1,陶玲1,李玉强2(1.兰州交通大学环境与市政工程学院,兰州730070;2.中国科学院寒区旱区环境与工程研究所,兰州730000)摘要:水体硝态氮污染是水污染研究的焦点之一。通过对兰州市7个县区农村98个生活饮用水水样的测定分析,结合国家相关标准(GB5749--2006),对兰州市农村生活饮用水硝态氮含量进行评价,并通过回归分析推断了不同水源类型水体硝酸根与电导率的相关性。结
2、果显示:①兰州农村生活饮用水水体硝态氮平均含量为(5.42+6.63)mg·L~,合格率为86.73%;②皋兰县、西固区和安宁区农村生活饮用水硝态氮含量无超标现象,榆中县、七里河区、永登县、红古区农村生活饮用水硝态氮含量较高,有不同程度超标现象,合格率分别为77.27%、77.78%、80.00%和83.33%;③不同水源类型水体硝态氮含量存在显著差异:自来水、河水和水库水合格率均为100%;窖水、深井水(>30m)和泉水硝态氮含量较高,合格率分别为92.00%、91.66%和55.56%;浅井水(<30m)硝态
3、氮平均含量最高,为(22.27_+10.54)mg·L~,合格率仅为25.00%;④除水库水和浅井水,其他类型水体硝酸根与电导率呈显著或极显著的正相关性;⑤浅井水中水体硝态氮含量与pH呈显著负相关;⑥浅井水和泉水水体硝态氮含量与农田氮投入量存在显著正相关性。关键词:农村生活饮用水;硝态氮;分布特征;回归分析中图分类号:X832文献标志码:A文章编号:1672—2043(2011)Ol一0183—07InvestigationonNitrateNitrogenDistributionCharacteristicso
4、fDrinkingWaterinLanzhouRuralArea,ChinaCHENYin-pin91,LUOYong-qin91,TAOLin91,LIYu-qian92(1.SchoolofEnvironmentalandMunicipalEngineering,LanzhouJiaotongUniversity,Lanzhou730070,China;2.ColdandAridRegionsEn-vironmentalandEngineeringResearchInstitute,ChineseAcadem
5、yofSciences,Lanzhou730000,China)Abstract:Thepollutantofnitrate—N(NOi—N)playsanimportantroleinwaterpollutionnowadays.AnalyzingthedataofNO;-Ncontentsofruraldrinkingwaterfrom98plotsaroundLanzhou,weevaluatedthewaterqualityincomparisonwiththeNationalStandard(GB574
6、9--2006),andinvestigatedthecorrelationbetweenNOicontentandtheEC.Theresultsshowed:①ThemeanNOi—Ncontentofdrinkingwaterwas(5.42_+6.63)mg·L。1andtheRateofQualification(RQ)was86.73%inLanzhoururalarea.@TheNOi-Ncontentswerenotbeyondthelim-itoftheNationalStandardinGao
7、lanCounty,XiguandAnningDistrict;whereasoverproofsampleswereobservedinYuzhongCounty,Qilihe,YongdengandHongguDistrict,inwhichtheRQwas77.27%,77.78%,80.00%and83.33%respectively.@SignificantdifferencesofNOi-Ncontentsweredetectedondifferenttypesofwater.TheRQwas100%
8、intapwater,riverwater,andpoolwater,whereastheRQwas92.00%,91.66%,and55.56%incellarwater,deepwell(morethan30m)water,andspringwater,respectively.ThehighestcontentofNO;-Nwasde-tectedinshallow
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