Pollution Characteristics Analysis in Shallow Groundwater of Typical Farmland Area, Southern China

GUO Hui1,2 YU Min-da3,4 HE Xiao-song3,4 LUO Yue-ping1,2

(1.Hunan Province Environmental Monitoring Centre, Changsha, China 410014)
(2.State Environmental Protection Key Laboratory of Monitoring for Heavy Metal Pollutants, Changsha, China 410014)
(3.State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, China 100012)
(4.Innovation Base of Groundwater and Environmental System Engineering, Chinese Research Academy of Environmental Sciences, Beijing, China 100012)

【Abstract】To analyze the characteristics of shallow groundwater pollution in farmland ecosystem in south China and geochemica behavior of major pollutants in the environment, taking the typical farmland in Taihu River Basin as the object, combined with conventional analysis method of the water quality, fluorescence spectrum technology and multivariate statistical analysis method, the characteristics of the water chemistry in shadow groundwater and the distribution of the dissolved organic matter and the heavy metal were studied. The reasons for all the phenomena were researched as well. The result showed that,water body in the study area showed the reducing atmosphere, the main chemical types of shallow groundwater were HCO3-Ca·Na, and compared to the contents of NH3--N and NH2--N, the concentration of NH4+-N was higher. Dissolved organic matter of the shallow groundwater was composed of humi acid, tryptophan and tyrosine. And they were mainly derived from terrestrial and biological source. The distribution was affected by th flow direction of the surface water supplies and groundwater. In the detection of nine kinds of heavy metal elements, the averag concentrations of Fe and Cr were higher than value of Tier III of Quality Standard for Groundwater (GB/T14848-93). And the contents o Fe, Cr, Mn, Zn elements at some points exceeded the standard. The results showed that fluorescent organic matter characteristic could better reflect the status of shallow groundwater pollution, in which the kind of protein-like substances was closely related to th ammonia nitrogen. The heavy metal elements Cu and Ni were associated with the dissolved organic matter and they were mainl complexed in small molecular fluorescent organic matter.To analyze the characteristics of shallow groundwater pollution in farmland ecosystem in south China and geochemica behavior of major pollutants in the environment,taking the typical farmland in Taihu River Basin as the object,combined with conventional analysis method of the water quality,fluorescence spectrum technology and multivariate statistical analysis method,th characteristics of the water chemistry in shadow groundwater and the distribution of the dissolved organic matter and the heavy metal were studied.The reasons for all the phenomena were researched as well.The result showed that,water body in the study area showed the reducing atmosphere,the main chemical types of shallow groundwater were HCO3-Ca·Na,and compared to the contents of NH3--N and NH2--N,the concentration of NH4+-N was higher.Dissolved organic matter of the shallow groundwater was composed of humi acid,tryptophan and tyrosine.And they were mainly derived from terrestrial and biological source.The distribution was affected by th flow direction of the surface water supplies and groundwater.In the detection of nine kinds of heavy metal elements,the averag concentrations of Fe and Cr were higher than the national groundwater environmental quality in classⅢstandard.And the contents o Fe,Cr,Mn,Zn elements at some points exceeded the standard.The results showed that fluorescent organic matter characteristic could better reflect the status of shallow groundwater pollution,in which the kind of protein-like substances was closely related to th ammonia nitrogen.The heavy metal elements Cu and Ni were associated with the dissolved organic matter and they were mainl complexed in small molecular fluorescent organic matter.

【Keywords】 natural water chemistry; organic matter; heavy metal; fluorescence excitation-emission matrix spectra; shallow groundwater; Taihu River Basin;

【DOI】

【Funds】 Research project of environmental protection public welfare industry (201309050)

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This Article

ISSN:0250-3301

CN: 11-1895/X

Vol 37, No. 12, Pages 4680-4689

December 2016

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Article Outline

Abstract

  • 1 Materials and methods
  • 2 Results and discussion
  • 3 Conclusions
  • References