Variations in nitrate isotope composition of wastewater effluents by treatment type in Hong Kong

2016 ◽  
Vol 111 (1-2) ◽  
pp. 143-152 ◽  
Author(s):  
A. Archana ◽  
Luo Li ◽  
Kao Shuh-Ji ◽  
Benoit Thibodeau ◽  
David M. Baker
Keyword(s):  
Hong Kong ◽  
Isotope Composition ◽  
Treatment Type ◽  
Nitrate Isotope ◽  
Wastewater Effluents

scholarly journals Global patterns of nitrate isotope composition in rivers and adjacent aquifers reveal reactive nitrogen cascading

2021 ◽  
Vol 2 (1) ◽  
Author(s):  
Ioannis Matiatos ◽  
Leonard I. Wassenaar ◽  
Lucilena R. Monteiro ◽  
Jason J. Venkiteswaran ◽  
Daren C. Gooddy ◽  
...  
Keyword(s):  
Isotope Composition ◽  
Management Strategies ◽  
Nitrogen Sources ◽  
Nitrate Pollution ◽  
Biogeochemical Processes ◽  
N Source ◽  
Biogeochemical Transformations ◽  
Patterns And Processes ◽  
Source Signals ◽  
Nitrate Isotope

AbstractRemediation of nitrate pollution of Earth’s rivers and aquifers is hampered by cumulative biogeochemical processes and nitrogen sources. Isotopes (δ15N, δ18O) help unravel spatiotemporal nitrogen(N)-cycling of aquatic nitrate (NO3−). We synthesized nitrate isotope data (n = ~5200) for global rivers and shallow aquifers for common patterns and processes. Rivers had lower median NO3− (0.3 ± 0.2 mg L−1, n = 2902) compared to aquifers (5.5 ± 5.1 mg L−1, n = 2291) and slightly lower δ15N values (+7.1 ± 3.8‰, n = 2902 vs +7.7 ± 4.5‰, n = 2291), but were indistinguishable in δ18O (+2.3 ± 6.2‰, n = 2790 vs +2.3 ± 5.4‰, n = 2235). The isotope composition of NO3− was correlated with water temperature revealing enhanced N-cascading in warmer climates. Seasonal analyses revealed higher δ15N and δ18O values in wintertime, suggesting waste-related N-source signals are better preserved in the cold seasons. Isotopic assays of nitrate biogeochemical transformations are key to understanding nitrate pollution and to inform beneficial agricultural and land management strategies.

Verocytotoxin-producing Escherichia coli infection: The Hong Kong experience

1998 ◽  
Vol 13 (11-s4) ◽  
pp. S289-S293 ◽  
Author(s):  
SSY WONG ◽  
WC YAM ◽  
PHM LEUNG ◽  
PCY WOO ◽  
KY YUEN
Keyword(s):  
Escherichia Coli ◽  
Hong Kong ◽  
Escherichia Coli Infection

Abstracts of the Annual Scientific Meeting of the College of Surgeons of Hong Kong 20-21 May 2000

2000 ◽  
Vol 4 (2) ◽  
pp. A5-A5
Author(s):  
P.B.S. Lai ◽  
W.Y. Lau ◽  
S.S.M. Ng ◽  
P.T. Chui ◽  
K.L. Leung ◽  
...  
Keyword(s):  
Hong Kong ◽  
Scientific Meeting ◽  
Annual Scientific ◽  
Annual Scientific Meeting
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