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Evaluation of surface runoff and road dust as sources of nitrogen using nitrate isotopic composition
- Source :
- Chemosphere. 84:1716-1722
- Publication Year :
- 2011
- Publisher :
- Elsevier BV, 2011.
-
Abstract
- Stable nitrogen and oxygen isotope ratios of nitrate (δ(15)N-NO(3) and δ(18)O-NO(3)) have recently been used to identify nitrogen sources in water environments. However, there have been no investigations designed to determine nitrate isotopes in non-point sources in urban areas for evaluating the impact of surface deposits on nitrogen in surface runoff. In this study, we collected rainwater, surface runoff and surface deposits (road dust, roof dust and soil) to evaluate the nitrogen sources in surface runoff using nitrate isotopes. There were no large differences in δ(15)N-NO(3) among rainwater (-0.3‰ to 1.5‰), surface runoff (-2.7‰ to 0.4‰), leachates from road dust (-5.8‰ to 6.2‰) and soil (-11.5‰ to 0.6‰). In contrast, the δ(18)O-NO(3) in surface runoff (28.5-47.9‰) was lower than that in rainwater (62.7-78.6‰), and higher than that in leachates from road dust (6.1-27.6‰) and soil (-1.1‰ to 6.6‰). δ(18)O-NO(3) is a useful indicator for evaluating the NO(3)-N sources in surface runoff. Using this indicator, NO(3)-N from road dust was estimated to account for more than half of the NO(3)-N in surface runoff. This is consistent with a result based on a comparison of their loads per unit surface between rainwater and surface runoff, which also showed that most of the nitrogen in surface runoff was derived from surface deposits.
- Subjects :
- inorganic chemicals
Environmental Engineering
Chemistry(all)
δ18O
Health, Toxicology and Mutagenesis
chemistry.chemical_element
Oxygen Isotopes
complex mixtures
Isotopes of oxygen
Rainwater harvesting
chemistry.chemical_compound
Nitrate
Environmental Chemistry
Nonpoint source pollution
Nitrates
Nitrogen Isotopes
fungi
Public Health, Environmental and Occupational Health
food and beverages
Dust
General Medicine
General Chemistry
Pollution
Nitrogen
Isotopes of nitrogen
chemistry
Environmental chemistry
Environmental science
Surface runoff
Water Pollutants, Chemical
Environmental Monitoring
Subjects
Details
- ISSN :
- 00456535
- Volume :
- 84
- Database :
- OpenAIRE
- Journal :
- Chemosphere
- Accession number :
- edsair.doi.dedup.....63bae4df76cce9b4897576d5f495c004