Sokoine University of Agriculture

Chemical hazards and health risks of consuming rice grown around mining areas in Tanzania: a case of Geita district

Show simple item record Nsonda, M. W. 2021-07-12T14:34:43Z 2021-07-12T14:34:43Z 2019
dc.description A Dissertation 2019 en_US
dc.description.abstract The main objective of this study was to assess health risks that may be associated with consumption of rice grown in three selected Wards of Rwamgasa, Magenge and Kaseme in Geita District.The agricultural soils ofthese wards are thought to have been contaminated with Mercury (Hg) used in amalgamation of Gold, and Arsenic (As)from anthropogenic sources (Arsenopyrates). Rice samples were collected from 15 villages of the selected Wards after which the concentrations of Hg and As were determined. The Association of Official Agricultural Chemists (AOAC 2015.01) was used for quantification of heavy metals.Macro Plasma Emission Spectroscopy (MP-AES 4210) equipped ith Auto sampler SPS4 was used in this case to quantify Hg and As. Concentrations (ppm) for each metal was significantly different (p<0.05) among sampling locations. The concentration of Hg and As per kg of rice in the sampled villages ranged from 0.78 mg/kg to 3.58 mg/kg at Rwamgasa and Mnekezi villages and 0.64 mg/kg to 1.01 mg/kg at Nyamalulu and Bingwa villages, respectively. Exposure analysis was established in line with health risks characterization for adults of 65 kg and children with 30 kg average body weight in which the calculated exposure dietary intake (EDI) was calculated. These results revealed that, concentration of Mercury exceeded the Maximum Allowable Concentration (MAC) of 0.02 mg/kgbw/day as per Ministry of Healthy of Health of the Republic of People of China (MHRPC). Further more, the health risk index (HRI) was computed as per USEPA/IRIS (2013) in which, for Mercury the Health Risk Index (HRI) exceeded 1 for children in villages of Rwamgasa, Iseni, Nyakayenze, Magenge, Nyamtondo, Nyamalimbe and Msasa implying health risks to children but there was no risks for adults. In the case of Arsenic it was observed that it did not pose health risks in both age groupssince the concentration did not exceed the MAC of 0.35 mg/kgbw/day approved by FAO/WHO (2016). en_US
dc.language.iso en en_US
dc.publisher sokoine university of agriculture en_US
dc.subject Chemical hazards en_US
dc.subject Health risks en_US
dc.subject Mining areas en_US
dc.subject Tanzania en_US
dc.subject Geita district en_US
dc.title Chemical hazards and health risks of consuming rice grown around mining areas in Tanzania: a case of Geita district en_US
dc.type Thesis en_US

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