Assessment of Zn, Cu, Pb and Ni contamination in wetland soils and plants in the Lake Victoria basin

Nabulo, G.; Origa, H. Oryem; Nasinyama, George William; Cole, Donald C.

doi:10.1007/bf03325998

Cited by 76 publications

(44 citation statements)

References 9 publications

(7 reference statements)

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“…The high concentration of heavy metals was stated in the surface soil horizons (0-25 cm), which was mainly of anthropogenic origin. It was also confirmed by the studies of Dusza et al (2013) and Nabulo et al (2008). The elevated contents of heavy metals in the surface horizons of sandy soils are usually a result of an increased organic matter and the soil capacity for retaining heavy metals.…”

Section: Content Of the Selected Heavy Metals In Soilsupporting

confidence: 60%

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Assessment of the content of heavy metals and potential pathogenic microorganisms in soil under illegal dumping sites

2016

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The aim of the study was the assessment of the environmental contamination of soil by heavy metals and microorganisms within the uncontrolled landfill dumps and the impact of anthropogenic sources on the activity of selected soil surface horizons. Some physicochemical properties were determined according to commonly used procedures in soil science laboratories. The total of heavy metals concentration was assessed according to Crock and Severson and forms available according to Lindsay and Norvell. The total contents and mobile forms were determined by atomic absorption spectrophotometry. As part of the microbiological tests, potentially pathogenic evidence of bacteria was found indicating fecal contamination of the soil (E. coli and other coliform bacilli, Salmonella spp., and Enterococcus spp.). Quantitative analyses were carried out based on the calculation of the most probable number of microorganisms (MPN method). The activity of selected redox and hydrolases enzymes: the activity of dehydrogenases with the Thalmann method, catalase with the Johnson and Temple method, alkaline and acid phosphatase with the method of Tabatabai and Bremner. It was concluded that depending on the composition of the dump, the physicochemical properties of the soil were changed, too. Uncontrolled landfills significantly affected the increase or decrease in the pH of the tested soil and the organic content of the tested soil. The waste stored at the site affected the contamination of the soil by heavy metals to varying degrees. The results show that the most dangerous bacteria exist in the soil under the C landfill and this is where the greatest risk of soil contamination exists. The highest amount of selected enzymes activity was observed in soils under illegal C dumping sites. In the soil sourced from A and B landfills, the enzyme inhibition occurred which was linked to the lowering of the organic carbon. The results of the principal component analysis demonstrated that the content of heavy metals and the activity of enzymes are the indicators of anthropogenic pollution, whereas granulometric composition (sand and silt) is mainly associated with the natural environment.

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Section: Content Of the Selected Heavy Metals In Soilsupporting

confidence: 60%

“…Nabulo et al (2008) found that the accumulation of heavy metals in surface soil level is closely correlated with the operation of the illegal deposit of waste. The high content of zinc, copper, lead and nickel was found directly beneath the waste in samples taken from the object C (Table 3).…”

Section: Content Of the Selected Heavy Metals In Soilmentioning

confidence: 99%

Assessment of the content of heavy metals and potential pathogenic microorganisms in soil under illegal dumping sites

2016

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“…[2]. Processing of the this product requires heavy metals [7][8][9]. Giving the apparent influence of pH large volume of water which in addition to some other on these physiochemical properties, developing the solid substances forms part of the waste.…”

Section: Introductionmentioning

confidence: 99%

Soil Quality Modeling of a Highly Acidic Eutric-tropofluvent Soil

Uzoije¹,

Onunkwo²

2011

International J. of Soil Science

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Abstract:Waste from garri processing centre of Umuagwo, Ohaji L.G.A of Imo state has impacted enormous pollution on the soil ecosystem of the centre. Huge resources and quality man hour have been spent on determining the level of such pollution in similar circumstances using laboratory techniques. In view of the aforementioned, the study developed several regression models, establishing the relationship between Ph and other selected soil physiochemical properties, to predict the values of the these selected properties in the polluted soils. The study took place in three sampling pedons A, B and C using the technique of stratified random sapling for sample collection. Pedon A is the background or the control unit, pedon B or the discharge point is the cassava mill effluent (CME) receiving unit and pedon C is the down stream, 500m away from pedon B. the result showed high values of soil physiochemical properties(mainly the heavy metals) at pedon B and the trend reduced away from pedon B and lowest in pedon A. In terms of pedons the heavy metal concentrations took this trend; pedon B>pedon C>pedonA. pH relationship with heavy metals in pedons A and B showed positive linear relationships with their coefficient of linearity(R2) ranging between 0.70-0.92 while other soil physiochemical properties obeyed polynomial relationships at reasonably high coefficient of fitness. Polynomial models fitted the pH relationships virtually in all the selected physiochemical properties of pedon C. The models have provided quick assessment of these physiochemical materials by mere determining the pH value and substituting the pH values into the models to predicting other properties.

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“…Thus, these findings differ from the experience in some other parts ofAfrica, where the application of large volumes of partially treated or untreated wastewater has adversely affected both surface water bodies and the urban and peri-urban farmers using these water bodies as sources of irrigation (Keraita and Drechsel, 2004). Also, in their studies in the Lake Victoria Basin, Nabulo et al (2008) found that heavy metals accumulated in wetlands used for wastewater disposal, the highest levels being recorded in wetlands receiving wastewater from multiple industrial sources.…”

Section: Introductionmentioning

confidence: 99%

“…Rusan et al (2007) concluded that continuous irrigation with wastewater could lead to accumulation of salts, plant nutrients and heavy metals (with the exception of Pb and Cd) in soils beyond crop tolerance levels. Also according to Nabulo et al (2008), uptake of trace metals from soil differs from plant to plant and from site to site. Thus, there is need for sustained studies in order to fully analyze and understand the long term environmental impacts of the use of treated sewage water for crop irrigation.…”

Section: Introductionmentioning

confidence: 99%

Comparative analysis of heavy metal concentration in secondary treated wastewater irrigated soils cultivated by different crops

Dikinya

Areola

2010

Int. J. Environ. Sci. Technol.

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ABSTRACT:The use of treated urban wastewater for irrigation is a relatively recent innovation in Botswana and knowledge is still limited on its impact on soil heavy metal levels. The aim of this study is to analyze and compare heavy metal concentration in secondary wastewater irrigated soils being cultivated to different crops: olive, maize, spinach and tomato in the Glen Valley near Gaborone City, Botswana. The studied crop plots have been cultivated continuously under treated wastewater irrigation for at least 3 years. Most crop farms have sandy loam, loamy sand soils. Based on food and agriculture organization, heavy metal threshold values for crop production have been studied. Results showed that the wastewater irrigated soils in the Glen Valley have higher cadmium, nickel and copper than desirable levels, while the levels of mercury, lead and zinc are lower than the maximum threshold values recommended for crop production. The control sites show that the soils are naturally high in some of these heavy metals (e.g copper, zinc, nickel) and that crop cultivation under wastewater irrigation has actually lowered the heavy metal content. Comparing between the crops, mercury and cadmium levels are highest in soils under maize and decline linearly from maize to spinach to olive to tomato and control site. By contrast, concentrations of the other metals are at their lowest in maize and then increase from maize to spinach to olive to tomato and to control site.

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Assessment of Zn, Cu, Pb and Ni contamination in wetland soils and plants in the Lake Victoria basin

Cited by 76 publications

References 9 publications

Assessment of the content of heavy metals and potential pathogenic microorganisms in soil under illegal dumping sites

Assessment of the content of heavy metals and potential pathogenic microorganisms in soil under illegal dumping sites

Soil Quality Modeling of a Highly Acidic Eutric-tropofluvent Soil

Comparative analysis of heavy metal concentration in secondary treated wastewater irrigated soils cultivated by different crops

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