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Identifying organic matter provenance in sediments using isotopic ratios in an urban river
Hua-Yun Xiao; Cong-Qiang Liu
2010
Source PublicationGeochemical Journal
Volume44Issue:3Pages:181-187
AbstractTo provide a better understanding of potential hazard of effluent detritus, both at the present and in the future, the dispersal and accumulation of sewage-derived materials in the receiving river should be addressed. For the goals, we determined concentrations and isotopic compositions of sedimentary organic carbon (SOC) and nitrogen (SON) and those of effluents in an urban river (Nanming River, China). In the river, the two major sources of sedimentary organic matter (SOM) are effluent detritus (delta C-13: 25.0 parts per thousand: delta N-15: +8.5 parts per thousand; C/N: 8.1) and C3 plants growing along the river bank (delta C-13: -27.7 parts per thousand; delta N-15: -0.9 parts per thousand; C/N: >28). Isotopic difference between the two end-members was observed to be 9.4 parts per thousand for nitrogen, compared with 2.7 parts per thousand for carbon, and hence nitrogen isotopic difference between end-members is large enough to be used as a tracer for source recognition of SOM. Using a mixing model, we found that at outfalls sewage-derived SON accounted for >60% of the bulk SON. At site 40 km far from outfall, fraction of sewage-derived SON was still high to 50%. But at most sites, though about 450,000 m(3) sewage effluents per day discharge into the river, effluent detritus and C3 plants contributed nearly the same to SOM, indicated that natural contribution from C3 plants should be also paid attention to.
KeywordRiverine Sediment Isotopic Ratios Effluent C3 Plants Sources
Subject Area环境地球化学
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/352002/6843
Collection环境地球化学国家重点实验室_环境地球化学国家重点实验室_期刊论文
Recommended Citation
GB/T 7714
Hua-Yun Xiao,Cong-Qiang Liu. Identifying organic matter provenance in sediments using isotopic ratios in an urban river[J]. Geochemical Journal,2010,44(3):181-187.
APA Hua-Yun Xiao,&Cong-Qiang Liu.(2010).Identifying organic matter provenance in sediments using isotopic ratios in an urban river.Geochemical Journal,44(3),181-187.
MLA Hua-Yun Xiao,et al."Identifying organic matter provenance in sediments using isotopic ratios in an urban river".Geochemical Journal 44.3(2010):181-187.
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