Browsing by Author "Tadesse, Mahlet"

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    Assessment of Leaching of Pottery Processed Foods A thesis Submitted to the School of Graduate studies of Addis Ababa University in partial fulfillment of the requirement for the Degree of Master of Science in Food Selected Toxic Metals in Some
    (Addis Ababa University, 2015-06) Tadesse, Mahlet; Mehari, Tetemke (PhD); Gashu, Dawd (PhD)
    Raw materials from uninspected sources used for making of cooking utensils could be a potential source for high toxic metal in food prepared in these utensils. Therefore, in the present work, the level of selected metals (Pb, Cd, and Al) in clay pots was determined. The clay pots were obtained from two sites kechene and legeberi the areas are selected because of the raw materials used to make them were brought from suspected places for metal contamination. In addition, leaching of those metals in some foods (bean stew, tomato sauce and coffee) prepared using these materials were investigated. Furthermore, factors that can influence metal leaching like frequent usage of the pots were also studied. Clay pots were crushed while the food and coffee samples were lyophilized and digested in a closed microwave digestion system. The levels of metals were determined using flame atomic absorption spectrophotometer (FAAS). The results showed that level of metals in clay pot from legeberi were Pb (26.7±0.0 mg/kg), Cd (5.6±0.1 mg/kg) and Al (38.74±0.7 mg/kg) and clay pot from kechene had Pb content (0.6±0.3 mg/kg), Cd (0.3±0.0 mg/kg) and Al (8.92±0.3 mg/kg). In addition, the level of metals leaching in food samples prepared using clay pots from legeberi showed tomato sauce Pb in range (from 9.6±0.0 mg/kg to 13±0.0 mg/kg), Cd (from 0.5±0.0 mg/kg to 1.2±0.0 mg/kg) and Al (from 11.53±0.4 mg/kg to 15.4 ±0.3). The bean stew prepared using clay pots from legeberi had Pb in the range (from1.2±0.0 mg/kg to 3.3±0.0 mg/kg), Cd (from 0.14 ±0.0 mg/kg to 0.38 ±0.0 mg/kg) and Al (from10.8±0.2 mg/kg to 13.5 ±0.3 mg/kg), whereas the coffee samples brewed in coffee pot from legeberi showed Pb in range (from1.6±0.0 mg/kg to 3.9±0.0 mg/kg), Cd (from 0.18 ±0.0 mg/kg to 0.34 ±0.0 mg/kg) and Al (from1.9±0.0 mg/kg to 3.8 ±0.1mg/kg). However, Pb and Cd were not detected in any of the food prepared using clay pot from kechene. The level of Al in food samples prepared in clay pot from kechene was tomato sauce in range (from10.5±0.5 mg/kg to 11.3±0.6 mg/kg), bean stew (from10.1±0.3 mg/kg to 10.4±0.4 mg/kg) and coffee (from1.1±0.0 mg/kg to 2.1 ±0.0 mg/kg). Results of the present investigation indicates that metal (Pb, Cd and Al) content of clay pot from legeberi was significantly higher (p<0.05) than clay pots from kechene. In this manner, food samples prepared using clay pot from legeberi had high level of metals (Pb, Cd and Al) beyond the permissible limit allowed by WHO, for Pb (0.01 mg/kg), Cd (0.003 mg/kg), and Al (1mg/kg) in food. Similar trend was observed for Al content of food prepared using clay pot from kechene. Therefore, metals (Pb, Cd, and Al) leaching due to cooking in legeberi clay pot and Al in clay pot from kechene could be a public health concern. Keywords: leaching; toxic metals;clay pot;;cooking frequenc
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    Assessment of Leaching of Sdeded Toxic Metals in Some Pottery Processed Foods
    (Addis Ababa University, 2015-06) Tadesse, Mahlet; Mehari, Tetemke(PhD)
    Raw materials from uni nspected sources used for making of cooking utensils could be a potential sou rce for high tox ic metal in food prepared in these utensils. Therefore, in the present work, the level of selected meta ls (Pb, Cd, and AI) in clay pots was determi ned. The clay pots were obta ined from two sites kechene and legeberi Ihe areas are selecled because of the raw materials used to make them were brought from suspected places for metal contaminat ion. In addition, leaching of those metals in some foods (bean stew, tomato sauce and coffee) prepared us ing these materials were investigated. Furthermore, factors that can influ ence metal leaching like frequent usage of the pots were also studied. Clay pots were crushed while the food and coffee samples were lyophilized and digested in a closed microwave digestion system. The levels of meta ls were determined using flame atom ic absorption spectrophotometer (FAAS). The results showed that level of metals in clay pot from legeberi were Pb (26.7±0.0 mg/kg), Cd (S.6±0. 1 mg/kg) and AI (38.74±0.7 mg/kg) and clay pot from kechene had Pb content (0.6±OJ mg/kg), Cd (0.3±0.0 mg/kg) and AI (8.92±0.3 mg/kg). In addi tion, the level of metals leaching in food samples prepared using clay pots from legeberi showed tomato sauce Pb in range (from 9.6±0.0 mg/kg to 13+0.0 mg/kg). Cd (from O.S±O.O mg/kg to 1.2±0.0 mg/kg) and AI (from 1 t.S3±OA mg/kg to 1504 ±OJ). The bean stew prepared usi ng clay pots from /egeberi had Pb in the range (fromI.2±0.0 mg/kg to 3.3±0.0 mg/kg), Cd (from 0.14 ±O.O mg/kg to OJ8 ±O.O mg/kg) and AI (from I 0.8±0.2 mg/kg to 13.5 ±0.3 mg/kg), whereas the coffee samples brewed in coffee pot from legeberi showed Pb in range (from I.6±0.0 mg/kg to 3.9±0.0 mg/kg), Cd (from 0.18 ±O.O mg/kg to 0.34 ±O.O mg/kg) and AI (from 1.9±0.0 mg/kg to 3.8 ±O. I mg/kg). However. Pb and Cd were not detected in any of the food prepared using clay pot from kechene . The level of AI in food samples prepared in clay pot from kechene was tomato sauce in range (from I O.S±O.S mg/kg to 11.3±0.6 mg/kg), bean stew (fromI 0. 1±0.3 mg/kg to 10A±OA mg/kg) and coffee (from t. 1±0.0 mg/kg to 2.1 ±O.O mg/kg). Results of the present in vestigation ind icates that metal (Pb, Cd and AI) content of clay pot from /egeberi was signiticantly higher (p