Freshwater bodies such as lakes, rivers, and their biodiversity are being threatened with water p... more Freshwater bodies such as lakes, rivers, and their biodiversity are being threatened with water pollution from industrial effluents and household sewages. The main objective of this study is to assess the effects of wet coffee processing plants effluent on the physicochemical and bacteriological properties of receiving rivers. Four rivers and 4 sampling points of the selected rivers were included in the study. Focus group discussion and interview were employed to gather primary data. The result showed that parameters of water quality for downstream of the rivers were significant, particularly in the dry season with BODs ranging from 45 ± 1 to 782.6 ± 97 g/ml, COD ranges from 71 ± 21 to 1072 ± 183 g/ml, Conductivity ranges from 75.5 ± 6.6 to 943 ± 56.3, Turbidity ranges from 7 ± 0.43 to 105 ± 6.2, TDS ranges from 62 ± 6.4 to 1059.6 ± 121 g/ml, temperature ranges from 20.1 to 33 ± 1, T. coli form ranges from 77 ± 1.1 to 493 ± 66 and E. coli ranges from 28 ± 1 to 213 ± 41 were signific...
Despite the great role of wild edible plants (WEPs) in ensuring food security and the fact that t... more Despite the great role of wild edible plants (WEPs) in ensuring food security and the fact that they can serve as a source of income, the consumption and acceptance varies from place to place. Although social, economic and cultural factors might have contributed for the avoidance of some edible wild plants, the fear of presence of toxic principles including heavy metals or their counter ions and antinutritional components might also be a barrier to the use of WEPs. In this study, the determination of the levels of some selected heavy metals (Cu, Cr, Ni, Cd and Pb) and antinutritional (oxalate) components are carried out using Flame Atomic Absorption Spectrophotometry and HPLC methods. The results showed that the mean metal concentration (mg/kg) in ripe fruit of WEP, unripe fruit of WEP and their underlying soil samples were 4.57, 5.77 and 3.22 (Cu), 2.37, 1.54, and 3.54 (Pb), 0.93, 0.63, and 0.42 (Cd), 2.02, 2.09, and 2.24 (Ni) and 2.47, 2.09, and 2.24 (Cr) respectively.The amounts ...
The aim of this work was to study the effectiveness of a coagulant that removes different polluta... more The aim of this work was to study the effectiveness of a coagulant that removes different pollutants. Adsorbent dose, contact time, and temperature in different turbidity were evaluated. The adsorbent dose were varied from 20–160 mg/l. The time were varied from 10 min– 310 min. The optimal conditions of adsorption obtained were 100 mg/l of adsorbent dose and 45 min contact time for high turbid (361 to 465 NTU) water and 40 mg/l for low turbid (36.8 to 39.9 NTU) water. Moringa stenopet ala is effective for high turbidity (98.5%). From 0.1 mg/l initial concentration of the metals, the highest removal efficiency of 82.9% was found for Pb and the lowest for Cr (53.18%). The results showed better fit by the Freundlich models, describing a multilayer adsorption. The thermodynamic studies suggested that a high temperature favors for the adsorption of heavy metals on M. stenopetala , indicating a spontaneous adsorption process. Keywords: M.stenopetala , Wastewater Treatment, Adsorption iso...
The current boom in construction sector of the country has aroused scientific concern about the s... more The current boom in construction sector of the country has aroused scientific concern about the safety of construction workers who regularly work with cement. The aim of this study was to determine the levels of selected heavy metals (Cr, Pb, Cd, Cu and Ni) in branded cement samples (Mugher, Dangote, Capital, and Derba) and soils around the Mugher cement factory. The level of the selected heavy metals in cement and soil samples were analyzed by Flame Atomic Absorption Spectroscopy. The detected range of metal concentrations (mg/kg dry mass) in different cement sample were Cu (0.131 ± 0.021-0.302 ± 0.004), Cd (0.02 ± 0.008-0.023 ± 0.008), Pb (0.187 ± 0.042- 0.353 ± 0.016), Cr (0.185 ± 0.017 - 0.765 ± 0.017), Ni (0.233 ± 0.002 - 0.906 ± 0.290) in ppm. Among the tested heavy metals Ni was found in highest concentration and it was in Capital cement sample. The heavy metal levels in the studied samples not comply with international standards. The detected range of the heavy metals in soi...
Samples were collected from Lake Hawassa, from six selected sampling sites. The measured physico-... more Samples were collected from Lake Hawassa, from six selected sampling sites. The measured physico-chemical parameters in lake water ranged pH(7.70-8.69), TDS(437-495 mg/L), EC(0.729-0.825 mS/cm), DO(6.2-14.6 mg/L), Temp.(20.7-23.4 0 C), Turb.(6.3-26.7 NTU), SO 4 2- (25-16), Cl - (42-23), F - (17.4-5.36), NO 3 -N (2.38-11.79), PO 4 3- (0.81-1.55), COD(219-1216), and BOD 5 (104-590) mg/L. The concentration of detected metals in water samples were in the range Cu(0.226-0.117), Mn(0.166-0.068), Zn(0.253-0.145), Mg(35.91–14.27), Ca(57.11-35.23), Na(87.49-87.49) and K(73.02-34.26) in mg/L. According to stream and potable waters standard recommendation, the maximum value of BOD 5 , COD, PO 4 3- and F - were above the acceptable range. The detectable metal concentration in water samples analyzed were Na>Ca>K>Mg>Zn>Cu>Mn. The concentration of Mn in the present study was above USEPA but below WHO guideline. The dendrogram figure shows that metal parameter of water samples at ...
American Journal of Essential Oils and Natural Products, 2015
Smelling a delightful aroma can be a very pleasurable experience with potential salutary benefits... more Smelling a delightful aroma can be a very pleasurable experience with potential salutary benefits. The natural aroma of the mango plant varieties is different, implying that the chemical compositions of the components are likely to be different. In this study we focused on the analysis and identification of volatile aroma components of the leaves of six mango varieties; Ngowe, Apple, Keit, Boribo, Tommy, Atkins and Van Dyke grown in Kenya in the same agro ecological area. The hydro-distilled oil from the leaves of these mango varieties were analyzed by gas chromatograph fitted with a flame ionization detector and coupled to a mass spectrometer. It was found that the chemical profile of all the six varieties were qualitatively and quantitatively different. The oils were rich in monoterpenes (46.98%), sesquiterpene (38.17%) with minor quantities of their analogues (10.67%) Trace amounts of nonterpenoid hydrocarbons and oxygenated hydrocarbons accounting for (4.19%) were also identifie...
Sediment and fish (nile Tilapia, Oreochromis niloticus) were collected from six sites of Lake Haw... more Sediment and fish (nile Tilapia, Oreochromis niloticus) were collected from six sites of Lake Hawassa namely; Tikur Wuha, Amora Gedel, Dorie Bafana, Central part of the lake, the opposite side of Amora Gedel and Referral Hospital sites. Concentration of heavy metals was analyzed quantitatively using Flame Atomic Absorption Spectrophotometer and Chemometric methods. The maximum and minimum mean levels (mg/kg dry mass) in different lake sediment sites were Cu (51.38-17.64), Mn (348.51-140.63), Cd (12.8764403), Pb (30.05-6.72), Ni (26.73-8.43 ), Zn (367.84-147.49), Cr (14.15-5.34), Co (27.199.59 ), Mg (3859.86-1872.43), Na (4913.72-2903.043), Ca (5526.74 3608.71), K (4229.69-2255.57) and that of fish muscle were Cu (13.833-5.666), Mn (11.972-9.722), Zn (21.110-12.055), Ca (574-482), Mg (512-437), Na (771-681), K (903-785). The result shows that the metal concentration in sediment samples is in order of Ca > Na > K > Mg > Zn > Mn > Cu > Pb > Co > Ni > Cr &g...
Freshwater bodies such as lakes, rivers, and their biodiversity are being threatened with water p... more Freshwater bodies such as lakes, rivers, and their biodiversity are being threatened with water pollution from industrial effluents and household sewages. The main objective of this study is to assess the effects of wet coffee processing plants effluent on the physicochemical and bacteriological properties of receiving rivers. Four rivers and 4 sampling points of the selected rivers were included in the study. Focus group discussion and interview were employed to gather primary data. The result showed that parameters of water quality for downstream of the rivers were significant, particularly in the dry season with BODs ranging from 45 ± 1 to 782.6 ± 97 g/ml, COD ranges from 71 ± 21 to 1072 ± 183 g/ml, Conductivity ranges from 75.5 ± 6.6 to 943 ± 56.3, Turbidity ranges from 7 ± 0.43 to 105 ± 6.2, TDS ranges from 62 ± 6.4 to 1059.6 ± 121 g/ml, temperature ranges from 20.1 to 33 ± 1, T. coli form ranges from 77 ± 1.1 to 493 ± 66 and E. coli ranges from 28 ± 1 to 213 ± 41 were signific...
Despite the great role of wild edible plants (WEPs) in ensuring food security and the fact that t... more Despite the great role of wild edible plants (WEPs) in ensuring food security and the fact that they can serve as a source of income, the consumption and acceptance varies from place to place. Although social, economic and cultural factors might have contributed for the avoidance of some edible wild plants, the fear of presence of toxic principles including heavy metals or their counter ions and antinutritional components might also be a barrier to the use of WEPs. In this study, the determination of the levels of some selected heavy metals (Cu, Cr, Ni, Cd and Pb) and antinutritional (oxalate) components are carried out using Flame Atomic Absorption Spectrophotometry and HPLC methods. The results showed that the mean metal concentration (mg/kg) in ripe fruit of WEP, unripe fruit of WEP and their underlying soil samples were 4.57, 5.77 and 3.22 (Cu), 2.37, 1.54, and 3.54 (Pb), 0.93, 0.63, and 0.42 (Cd), 2.02, 2.09, and 2.24 (Ni) and 2.47, 2.09, and 2.24 (Cr) respectively.The amounts ...
The aim of this work was to study the effectiveness of a coagulant that removes different polluta... more The aim of this work was to study the effectiveness of a coagulant that removes different pollutants. Adsorbent dose, contact time, and temperature in different turbidity were evaluated. The adsorbent dose were varied from 20–160 mg/l. The time were varied from 10 min– 310 min. The optimal conditions of adsorption obtained were 100 mg/l of adsorbent dose and 45 min contact time for high turbid (361 to 465 NTU) water and 40 mg/l for low turbid (36.8 to 39.9 NTU) water. Moringa stenopet ala is effective for high turbidity (98.5%). From 0.1 mg/l initial concentration of the metals, the highest removal efficiency of 82.9% was found for Pb and the lowest for Cr (53.18%). The results showed better fit by the Freundlich models, describing a multilayer adsorption. The thermodynamic studies suggested that a high temperature favors for the adsorption of heavy metals on M. stenopetala , indicating a spontaneous adsorption process. Keywords: M.stenopetala , Wastewater Treatment, Adsorption iso...
The current boom in construction sector of the country has aroused scientific concern about the s... more The current boom in construction sector of the country has aroused scientific concern about the safety of construction workers who regularly work with cement. The aim of this study was to determine the levels of selected heavy metals (Cr, Pb, Cd, Cu and Ni) in branded cement samples (Mugher, Dangote, Capital, and Derba) and soils around the Mugher cement factory. The level of the selected heavy metals in cement and soil samples were analyzed by Flame Atomic Absorption Spectroscopy. The detected range of metal concentrations (mg/kg dry mass) in different cement sample were Cu (0.131 ± 0.021-0.302 ± 0.004), Cd (0.02 ± 0.008-0.023 ± 0.008), Pb (0.187 ± 0.042- 0.353 ± 0.016), Cr (0.185 ± 0.017 - 0.765 ± 0.017), Ni (0.233 ± 0.002 - 0.906 ± 0.290) in ppm. Among the tested heavy metals Ni was found in highest concentration and it was in Capital cement sample. The heavy metal levels in the studied samples not comply with international standards. The detected range of the heavy metals in soi...
Samples were collected from Lake Hawassa, from six selected sampling sites. The measured physico-... more Samples were collected from Lake Hawassa, from six selected sampling sites. The measured physico-chemical parameters in lake water ranged pH(7.70-8.69), TDS(437-495 mg/L), EC(0.729-0.825 mS/cm), DO(6.2-14.6 mg/L), Temp.(20.7-23.4 0 C), Turb.(6.3-26.7 NTU), SO 4 2- (25-16), Cl - (42-23), F - (17.4-5.36), NO 3 -N (2.38-11.79), PO 4 3- (0.81-1.55), COD(219-1216), and BOD 5 (104-590) mg/L. The concentration of detected metals in water samples were in the range Cu(0.226-0.117), Mn(0.166-0.068), Zn(0.253-0.145), Mg(35.91–14.27), Ca(57.11-35.23), Na(87.49-87.49) and K(73.02-34.26) in mg/L. According to stream and potable waters standard recommendation, the maximum value of BOD 5 , COD, PO 4 3- and F - were above the acceptable range. The detectable metal concentration in water samples analyzed were Na>Ca>K>Mg>Zn>Cu>Mn. The concentration of Mn in the present study was above USEPA but below WHO guideline. The dendrogram figure shows that metal parameter of water samples at ...
American Journal of Essential Oils and Natural Products, 2015
Smelling a delightful aroma can be a very pleasurable experience with potential salutary benefits... more Smelling a delightful aroma can be a very pleasurable experience with potential salutary benefits. The natural aroma of the mango plant varieties is different, implying that the chemical compositions of the components are likely to be different. In this study we focused on the analysis and identification of volatile aroma components of the leaves of six mango varieties; Ngowe, Apple, Keit, Boribo, Tommy, Atkins and Van Dyke grown in Kenya in the same agro ecological area. The hydro-distilled oil from the leaves of these mango varieties were analyzed by gas chromatograph fitted with a flame ionization detector and coupled to a mass spectrometer. It was found that the chemical profile of all the six varieties were qualitatively and quantitatively different. The oils were rich in monoterpenes (46.98%), sesquiterpene (38.17%) with minor quantities of their analogues (10.67%) Trace amounts of nonterpenoid hydrocarbons and oxygenated hydrocarbons accounting for (4.19%) were also identifie...
Sediment and fish (nile Tilapia, Oreochromis niloticus) were collected from six sites of Lake Haw... more Sediment and fish (nile Tilapia, Oreochromis niloticus) were collected from six sites of Lake Hawassa namely; Tikur Wuha, Amora Gedel, Dorie Bafana, Central part of the lake, the opposite side of Amora Gedel and Referral Hospital sites. Concentration of heavy metals was analyzed quantitatively using Flame Atomic Absorption Spectrophotometer and Chemometric methods. The maximum and minimum mean levels (mg/kg dry mass) in different lake sediment sites were Cu (51.38-17.64), Mn (348.51-140.63), Cd (12.8764403), Pb (30.05-6.72), Ni (26.73-8.43 ), Zn (367.84-147.49), Cr (14.15-5.34), Co (27.199.59 ), Mg (3859.86-1872.43), Na (4913.72-2903.043), Ca (5526.74 3608.71), K (4229.69-2255.57) and that of fish muscle were Cu (13.833-5.666), Mn (11.972-9.722), Zn (21.110-12.055), Ca (574-482), Mg (512-437), Na (771-681), K (903-785). The result shows that the metal concentration in sediment samples is in order of Ca > Na > K > Mg > Zn > Mn > Cu > Pb > Co > Ni > Cr &g...
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