VTechWorks staff will be away for the winter holidays starting Tuesday, December 24, 2024, through Wednesday, January 1, 2025, and will not be replying to requests during this time. Thank you for your patience, and happy holidays!
 

Effect of Organic Amendments on Heavy Metal Distribution and Uptake in Vegetable Gardens in Senegal

Simple item page
dc.contributor.authorDiouf, Aissatouen
dc.contributor.committeechairEick, Matthew J.en
dc.contributor.committeememberEvanylo, Gregory K.en
dc.contributor.committeememberGalbraith, John M.en
dc.contributor.departmentCrop and Soil Environmental Sciencesen
dc.date.accessioned2016-09-24T08:00:32Zen
dc.date.available2016-09-24T08:00:32Zen
dc.date.issued2016-09-23en
dc.description.abstractThe major constraints to food production in West Africa are related to the lack of suitable lands. Consequently, farmers incorporate organic amendments and wastewater to improve their yields. Within some limits, such wastes enhance soil fertility and can improve its physical properties. However, the advantages of using organic waste as fertilizer and soil amendment should be assessed with possible environmental and toxicological impacts due to the potential presence of heavy metals. The objective of this study was to assess the effect of organic amendments on heavy metal distribution in soils and vegetables in market gardens in Senegal. Organic amendments and soils samples were collected from four sites in eastern and southern Senegal. Samples were analyzed for physicochemical properties including particle size, total heavy metals, carbon content, nutrients, and pH. A sequential extraction procedure was conducted to determine heavy metal sinks. Results showed that sites were sandy in nature, low to medium in organic carbon content (8300 to 36600 mg kg-1), and had pH ranging from 5 to 7.9. The sequential extraction procedure showed that metals were distributed in the more stable soil fractions: Fe-Mn oxide, organic and residual. The highest soil metal concentrations in soils were found in Pikine and Rufisque sites. Plant samples were collected from these two sites and analyzed for total metal content. Results showed that all metal concentrations in soils, organic amendments, and vegetables were within the safe limits proposed by the World Health Organization, with the exception of Cd, Pb and Zn levels in vegetables.en
dc.description.abstractgeneralApplication of composted organic wastes and untreated wastewater to urban vegetable garden soils is raising serious concerns about possible health risks associated with the consumption of these vegetables particularly with regard to the concentrations of heavy metals in their edible portions. Therefore, this study focused on the evaluation of heavy metal concentrations in soils, organic amendments and vegetables from local gardens of Senegal and also, the determination of metal sinks in soil phases via a sequential extraction procedure (SEP). Soils, organic matter and vegetable concentrations of cadmium, cobalt, chromium, copper, manganese, nickel, lead and zinc were analyzed for total metals. Results from the SEP showed that metals in soils were located on the stable soil phases and would not be easily released unless environmental conditions changed (e.g. more acidic pH or anoxic conditions). Data from total metal analyses revealed that all metal concentrations in soil, organic amendments, and vegetables were within the safe limits proposed by the World Health Organization (WHO) with the exception of Cd, Pb and Zn levels in vegetables.en
dc.description.degreeMaster of Scienceen
dc.format.mediumETDen
dc.identifier.othervt_gsexam:8874en
dc.identifier.urihttp://hdl.handle.net/10919/73036en
dc.publisherVirginia Techen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectAnimal manureen
dc.subjectheavy metalsen
dc.subjectwastewateren
dc.subjectsewage sludgeen
dc.subjectsequential extraction procedureen
dc.titleEffect of Organic Amendments on Heavy Metal Distribution and Uptake in Vegetable Gardens in Senegalen
dc.typeThesisen
thesis.degree.disciplineCrop and Soil Environmental Sciencesen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

Files

Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
Diouf_A_T_2016.pdf
Size:
2.58 MB
Format:
Adobe Portable Document Format
Download

Collections

Masters Theses