The contribution of roadside soil to phosphorus loading in the eutrophic Lagos Lagoon, Nigeria

Abayomi, Akeem A.; Nimmo, Malcolm; Williams, Claire; Olayinka, Kehinde O.; Osuntogun, Bola; Alo, Babajide I.; Worsfold, Paul J.

doi:10.1039/c1em10266d

Cited by 5 publications

(1 citation statement)

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“…It is a fairly shallow expanse of water (0.3-3 m deep) which is about 50 km long and 3 to 13 km wide and separated from the Atlantic Ocean by a narrow strip of barrier bar complex. The lagoon is used for fishing, irrigation and recreation.Its pollution by PTM has potential adverse effects on both aquatic life and onhuman beings whose life and livelihood depend on the Lagos Lagoon (Abayomi et al 2011;Isebor et al 2006;WES 1997). Dredging of sediment from the lagoon, although illegal, is commonplace to satisfy local demand for building materials.…”

Section: Introductionmentioning

confidence: 99%

Multivariate analysis of potentially toxic metals in sediments of a tropical coastal lagoon

Oyeyiola

Davidson

Olayinka

et al. 2012

Environ Monit Assess

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9Surface sediments collected from the Lagos Lagoon, Nigeria, and three adjoining rivers were 10 analysed for their physicochemical properties and pseudototal concentration of the potentially 11 toxic metals (PTM) Cd, Cr, Cu, Pb and Zn. The concentration of the PTM varied seasonally and 12 spatially. Odo-Iyaalaro was observed to be the most polluted river, with highest concentrations of 13 42.1 mg kg -1 , 102 mg kg -1 , 185 mg kg -1 , 154 mg kg -1 and 1040 mg kg -1 of Cd, Cr, Cu, Pb and Zn 14 respectively, while Ibeshe River was the least contaminated, apart from a site affected by Cu from 15 the textile industry. Some of the sediments were found to be above the consensus-based probable 16 effect concentrations and Dutch sediment guideline for metals. Overall metal concentrations were 17 similar to those reported for other tropical lagoon and estuarine systems affected by anthropogenic 18 inputs as a result of rapid urbanisation. Due to the large number of samples, principal component 19 analysis was used to examine relationships within the data set. Generally, sediments collected 20 during the dry season were observed to have higher concentration of PTM than those collected 21 during the rainy season. This means that PTM could accumulate over a prolonged period and then 22 be released relatively rapidly, on an annual basis, into tropical lagoon systems. Rapid urbanisation and industrialisation can lead to the release of a wide variety of pollutants, 2 from both point and diffuse sources, and thus place considerable pressure on aquatic resource such 3 as coastal and riverine systems. This is of particular concern in developing countries where 4 expansion of urban area may be relatively unregulated and where environmental protection may 5 be, or may historically have been, inadequate (Fonesca et al. 2011; Li et al. 2007; Manning 2011; 6 Nriagu 1992; Ramessur et al. 2010). 7 8 Sediments in tropical lagoon and estuarine systems of developing countries are increasingly 9 studied because they can act as both sinks for potentially toxic metals (PTM), allowing records of 10 past inputs to be reconstructed where no contemporary monitoring data exists, and as sources, with 11 potential impacts on ecosystems and human health (Acevedo-Figueroa et al. 2006; Ahmad et al. 12 2010; Alagarsamy 2006; Alaoui et al. 2010; El Ati Hellal et al. 2011; Fonesca et al. 2011; Jara-13 Marini et al. 2008; Li et al. 2007; Pereira et al. 2010; Vázquez-Sauceda et al. 2011; Xu et al. Study areas 15The study areas include the Lagos Lagoon and three rivers: Odo-Iyaalaro, Shasha and Ibeshe 16Rivers. Sediments samples were collected from each of the rivers six times during the year at 17 different seasons (rainy and dry). Samples were collected at three points along each river, at the 18 points of discharge of each of the rivers, and at points approximately 1 km offshore and to the east 19 and west of the discharge of the rivers into the Lagos Lagoon ( Figure 1 shows the sampling 20 stations). The Lagos Lagoon was sampled three...

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Section: Introductionmentioning

confidence: 99%