Heavy Metal Concentrations in Water, Sediments and Common Carp (&lt;em&gt;Cyprinus carpio&lt;/em&gt;) Fish Species from Lake Naivasha, Kenya

Ogendi, George Morara; Maina, G.M.; Mbuthia, J.W.; Koech, H.K.; Ratemo, C.M.; Koskey, Judith Chepkorir

doi:10.19026/rjees.6.5252

Cited by 12 publications

(4 citation statements)

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“…Begum et al (2009) found the maximum concentrations of Cr, Cd and Pb to be 2.5, 4.9 and 7.2 g/L, respectively. However Ogendi and colleagues (2014), found maximum concentrations of Cd, Cu and Pb to be 0.06, 0.13 and 0.50 g/L, respectively in Lake Naivasha, Kenya (Ogendi et al, 2014). The concentrations found by both authors were lower than the ones obtained in this study.…”

Section: Toxic Metals In Waste Stabilization Pondscontrasting

confidence: 77%

Simple metal model for predicting uptake and chemical processes in sewage-fed aquaculture ecosystem

Azanu

Jørgensen

Darko

et al. 2016

Ecological Modelling

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Section: Toxic Metals In Waste Stabilization Pondscontrasting

confidence: 77%

Simple metal model for predicting uptake and chemical processes in sewage-fed aquaculture ecosystem

Azanu

Jørgensen

Darko

et al. 2016

Ecological Modelling

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“…Fluctuations in the intensity of solar radiation could be responsible for the seasonal variations in the levels of the parameters [16]. The temperature values recorded in this study were higher than values (25.80±0.5°Ϲ to 26.50±1.0°Ϲ) reported for water samples from River Msimbazi [18] and the 20.30±2.3°Ϲ to 23.24±2.0°Ϲ recorded for water samples from Lake Nairasha [19]. pH and SO 4 2levels were lower compared to the levels reported for water from Mada River, Nasarawa state, Nigeria [20], while TDS and phosphate levels were similar to the results published for River Kaduna [21].…”

Section: -contrasting

confidence: 62%

Spatial and Temporal Variations in Physicochemical Properties of an Aquatic Environment

Eze

Tukura

Atolaiye

et al. 2018

CSIJ

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The study was carried out to evaluate spatial and temporal variations in the levels of some physicochemical parameters in water and sediments from Mpape River, Abuja, Nigeria. The samples were collected along the river bank in dry and rainy seasons from five (5) locations and were analysed using standard methods. Levels of pH, nitrate, phosphate, and biochemical oxygen demand (BOD) in water did not vary according to sites. However, the highest levels of electrical conductivity (EC) and total dissolved solids (TDS) were recorded at site 4 for both seasons. During the dry season, levels of pH (7.36±0.16), EC (300.73±0.05 µs/cm), TDS (185.11±0.10 mg/L), BOD (0.98±0.30 mg/L), SO 4 2-(9.8±0.14 mg/L) and Cl-(38.00±0.15 mg/L) in water were higher. Concentrations (3.42±0.10 mg/L) of dissolved oxygen (DO), PO 4 3-(5.

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“…While the distribution of nutrient concentration in the catchment is likely to be a consequence of diffuse sources from land-use, the signi cantly higher nutrient concentrations at K1 (River Karati Highway Bridge) suggest higher point-source contribution from extensive agricultural farms around the site. The particular (K1) site has been documented by previous studies to show high concentrations of heavy metals [44], [45], and nutrients [46], [47] which indicates potential negligent use of agrochemicals. Although Everard et al [48] argue that the geological difference between the Karati River sub-catchment and the other river sub-catchments could explain the high chemical contamination at K1, the consistently higher concentrations at the site, indicates anthropogenic, point-source pollution.…”

Section: Intensi Cation and Contamination In Lake Naivasha Catchmentmentioning

confidence: 99%

Potential Risks of Agricultural Intensification in Tropical Catchments: the Case of Lake Naivasha

Onyango

Kitaka

Bruggen

et al. 2022

Preprint

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The use of both fertilizers and pesticides in the Lake Naivasha Catchment, is associated with agricultural intensification and has resulted in enrichment of aquatic ecosystems with nutrients, coupled with exposure of aquatic biota to pesticide residues affecting aquatic ecosystem structure and function. This study explored the changes in land use and related it with the concentrations of nutrients and selected pesticides, to show the potential of combined (nutrients and pesticides) risks associated with agricultural intensification in Lake Naivasha catchment, a tropical catchment in Kenya. The results indicate that between 1989 and 2019 there was an increase of cropland by 623 km2, a reduction of forest cover by 200 km2, increase of grasslands by 534 km2, a reduction in bare soils by 100 km2, and an increase of 540 km2 of built area. The land cover changes were correlated with increased concentrations of nutrients and pesticides in surface waters across sampling sites monitored in 2015. The results further indicated that while the concentrations of nitrogen and phosphorus indicated a potential stoichiometric nitrogen limitation, increase in forest cover resulted in decreased nutrient concentrations in the river water. Concentrations of DDT and technical HCH active ingredients indicated significant relationships between land use changes and intensification. Areas with extensive farming systems were associated with higher concentrations of TP and ∑DDT compared with areas of high intensification, which may reflect high connectivity between intensive agricultural systems and river ecosystems. When combined nutrients and pesticides were considered, most of the lower reaches of the rivers draining to L. Naivasha were of poor water quality status as defined by Kenyan water quality regulations. The changes in land cover and agricultural intensification in the Naivasha catchment needs management and policy frameworks that manage the combined contamination from nutrients and pesticide residues. Enhanced investment in institutional and policy reforms, and an integrated review of water quality standards and monitoring indicators that combine biological, physical, and chemical monitoring, is necessary for future management of the catchment.

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Heavy Metal Concentrations in Water, Sediments and Common Carp (<em>Cyprinus carpio</em>) Fish Species from Lake Naivasha, Kenya

Cited by 12 publications

References 0 publications

Simple metal model for predicting uptake and chemical processes in sewage-fed aquaculture ecosystem

Simple metal model for predicting uptake and chemical processes in sewage-fed aquaculture ecosystem

Spatial and Temporal Variations in Physicochemical Properties of an Aquatic Environment

Potential Risks of Agricultural Intensification in Tropical Catchments: the Case of Lake Naivasha

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