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引用本文:许宽,刘波,王国祥,周锋,凌芬,杜旭.城市污染河道沉积物可提取态氮的提取方式比较.湖泊科学,2012,24(4):541-545. DOI:10.18307/2012.0406
XU Kuan,LIU Bo,WANG Guoxiang,ZHOU Feng,LING Fen,DU Xu.Comparison of different extract methods on extractable nitrogen in sediments from an urban polluted river. J. Lake Sci.2012,24(4):541-545. DOI:10.18307/2012.0406
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城市污染河道沉积物可提取态氮的提取方式比较
许宽1, 刘波1,2, 王国祥1, 周锋1, 凌芬1, 杜旭1
1.南京师范大学地理科学学院, 南京 210046;2.南通大学地理科学学院, 南通 226000
摘要:
以城市污染河道——南京仙林大学城九乡河表层沉积物为研究对象,探讨沉积物常用提取剂(1 mol/L KCl、2 mol/L KCl、4 mol/L KCl和0.01 mol/L CaCl2)在不同液土比(5:1、10:1、50:1和100:1)条件下,对城市污染河道沉积物可提取态氮(NH4+-N、NO3--N)测定的影响.结果表明:KCl的提取效果要优于CaCl2,二者NH4+-N提取量分别为312.17~479.23、177.52~339.31 mg/kg,NO3--N提取量分别为4.49~21.56、4.25~8.53 mg/kg;可提取态氮提取量随液土比增高而增大,其中1 mol/L KCl组,液土比100:1时NH4+-N和NO3--N提取量分别比液土比5:1时增加41.97%和187.08%;NH4+-N提取量随提取剂浓度增高而增大,NO3--N随提取剂浓度增高而降低;采用1 mol/L KCl提取剂、液土比100:1的组合联合提取城市污染河道沉积物中的NH4+-N、NO3--N,提取效果较好.
关键词:  污染河道  沉积物  可提取态氮  提取方式
DOI:10.18307/2012.0406
分类号:
基金项目:江苏省科技厅科技支撑计划项目(BE2008677);江苏省太湖水环境治理专项基金项目(TH2010303);住房和城乡建设部科技项目(2010-K7-7)联合资助
Comparison of different extract methods on extractable nitrogen in sediments from an urban polluted river
XU Kuan1, LIU Bo1,2, WANG Guoxiang1, ZHOU Feng1, LING Fen1, DU Xu1
1.School of Geographical Science, Nanjing Normal University, Nanjing 210046, P. R. China;2.School of Geographical Science, Nantong University, Nantong 226000, P. R. China
Abstract:
To explore the influence of different extractant (1 mol/L KCl, 2 mol/L KCl, 4 mol/L KCl and 0.01 mol/L CaCl2) and ratio of water to sediment (5:1, 10:1, 50:1 and 100:1) on the determination of extractable nitrogen in sediments from an urban polluted river, surface sediments of Jiuxiang River in Xianlin university town of Nanjing was used in the experiment. Result showed that KCl extract nitrogen more effectively than CaCl2. The amount of NH4+-N extracted by KCl and CaCl2 ranged from 312.17 mg/kg to 479.23 mg/kg and 177.52 mg/kg to 339.31 mg/kg, respectively, while NO3--N extracted by them ranged from 4.49 mg/kg to 21.56 mg/kg and 4.25 mg/kg to 8.53 mg/kg, respectively. The amount of extractable nitrogen increased with water-sediment ratios. In the experiment group of 1 mol/L KCl, the extract amount of NH4+-N and NO3--N increased by 41.97% and 187.08%when the ratio of water to sediment ranged from 5:1 to 100:1, respectively. The amount of NH4+-N extracted increased with higher extractant concentrations, while NO3--N decreased with lower ones. The experiment suggested that 1 mol/L KCl as extractant and the water-sediment ratio of 100:1 make a better combination when using for extracting NH4+-N and NO3--N from the urban river sediment.
Key words:  Polluted river  sediment  extractable nitrogen  extract method
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