Wet nitrogen and phosphorus deposition in the eutrophication of the Lagos Lagoon, Nigeria
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Date
2017-01-18
Authors
Oladosu, N. O.
Abayomi, A. A.
Olayinka, K. O.
Alo, B. I.
Journal Title
Journal ISSN
Volume Title
Publisher
Springer
Abstract
Air pollution is influenced by wind-aided particu-
late suspension, open-air waste burning, and fossil fuel combustion. The pollutants from these sources eventually deposit on ambient surfaces. Atmospheric wet deposition into Lagos
Lagoon may be significant additions to the nutrient levels of the eutrophic lagoon. Precipitation was monitored at three stations in the Lagos Lagoon basin from May to November, 2012, in order to estimate the contribution of wet deposition to
the nutrient cycles of the lagoon. Water samples were digested with potassium persulfate, and the species of phosphorus (P) and nitrogen (N) were analyzed by colorimetric methods. The
mean [NO3− +NO2−]-N level was 0.39 ± 0.51 kg ha−1 month−1. The average total N was 3.16 ± 6.39 kg ha−1 month−1. The mean soluble reactive P was lower than the [NO3− + NO2−]-N averaging 0.06 ± 0.09 (at control site S2) to
0.24 ± 0.10 kg ha−1 month−1 (at site S1). Average total P
was 1.25 ± 0.82 kg ha−1 month−1
. The annual total N
(May–September) was 4.55 (at S2) to 32.4 kg ha−1 year−1
(at S3). The annual total P (May–November) over Lagos
Lagoon basin was 5.06 kg ha−1 year−1 (at S2). This study
demonstrated that wet deposition of anthropogenically
derived nutrients to the Lagos Lagoon is ongoing and may
represent a considerable proportion of the total nutrient load-
ing to it. The increased P availability in the wet deposition is likely responsible for the water hyacinths, which usually
blossom on Lagos Lagoon during the late rainy season, and the reported harmattan-season bottom water hypoxia.
Description
Staff Publications
Keywords
Research Subject Categories::NATURAL SCIENCES::Chemistry::Analytical chemistry::Separation methods , Tracegases , Aerosol , Wetdeposition , Nitrogen , Phosphorus
Citation
Oladosu, N. O., Abayomi, A. A., Olayinka, K. O., & Alo, B. I. (2017). Wet nitrogen and phosphorus deposition in the eutrophication of the Lagos Lagoon, Nigeria. Environmental Science and Pollution Research, Vol. 24(9), 8645-8657pp.