Browsing by Author "Chove, B"

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    Examination of seasonal variability of indicator polychlorinated biphenyls in nile perch products from lake Victoria, Tanzania
    (TAJAS, 2021) Wenaty, A; Chove, B
    In the current study, Nile perch products were analysed for seasonal variations in the levels of indicator polychlorinated biphenyls (PCBs). Samples of fish products were collected from Lake Victoria during the dry and rainy seasons and extracted using a common method referred to as QuEChERS (quick, easy, cheap, effective, rugged and safe) methodology. The residues of PCBs in fish samples were detected and quantified by using a Gas Chromatography equipped with Electron Capture Detectors and a Gas Chromatography equipped with Mass Spectrometer (GC-ECD/GC- MS). The concentrations of indicator PCBs in fish samples were generally greater during the rainy seasons than the dry seasons suggesting that seasonality has significant impacts on PCBs contamination in fish. However, the total PCBs in fish in the current study for both seasons were lower than the Maximum Recommended Limits of 75μg/kg that is set by the European Commission for fish and other fishery products. This indicates that the Nile perch products from Lake Victoria are safe for human consumption based on the studied toxicants
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    Influence of bio-rock P fertilizer on nutritional composition of whole maize grains: the case of Madaba and Morogoro, Tanzania
    (An International Journal of Basic and Applied Research, 2022) Chove, B; Tindwa, H; Pela, S
    This study was designed to understand the influence of Bio-rock P fertilizer as the source of phosphorous on nutritional composition in maize grain. Bio-rock P fertilizer is a preparation made of rock phosphate and phosphate solubilizing bacteria (PSB). The experiment was laid out in randomized complete block design with three replications each receiving five rates of bio-rock phosphate fertilizer (Control, 20 kg P/ha with PSB, 40 kg P/ha with PSB, 60 kg P/ha with PSB and 80 kg P/ha with PSB). The study was carried out at two geographically different sites; Magadu in Morogoro and Madaba in Ruvuma for the duration of 90 days in the 2019 - 2021 cropping season. In both sites, the results showed that, bio-rock phosphate fertilizer rates had no significant influence on percentage protein, carbohydrate, fibre and moisture content. However, Bio-rock P rates had a significant effect on ash and fat contents of maize grains (p<0.05). Bio-rock phosphate fertilizer rates had no significant influence on percentage protein, carbohydrate, fibre and moisture content. For mineral content, there was significant difference in P, K, Mg, and Fe in Magadu and Madaba samples. Therefore, application of bio-rock phosphate increased macronutrients content (ash and fat) and some of micronutrients specifically phosphorous, potassium, magnesium and iron content and as the rates of bio-rock phosphate increased.