An-Najah National University

An-Najah Blogs


  • Thursday, May 1, 2008
  • Efficiency of removal of cadmium from aqueous solutions by plant leaves and the effects of interaction of combinations of leaves on their removal efficiency
  • Published at:Journal of Environmental Management, Volume 87, Issue 3, May 2008, Pages 521-532
  • Removal of cadmium from aqueous solutions using 20 species of plant leaves and combinations of these leaves have been studied. Several factors affecting the removal efficiency have been studied. The most efficient types of plant leaves for the removal of cadmium are those of styrax, plum, pomegranate and walnut. The interaction effect of the combined leaf samples on the efficiency of removal of cadmium has been found to be additive in combinations involving styrax plant leaves but seems to be antagonistic in all other combinations. The optimum experimental conditions for removal of cadmium have been found to be at pH 4.1, using high concentrations of naturally dried plant leaves, using ground leaves and to remove cadmium from agitated aqueous solutions. The percentage of metal removed at an initial cadmium concentration of 10 mg/l by the most efficient types of leaves have been found to be 85% for styrax leaves, 85% for plum leaves, 80% for pomegranate leaves, 78% for walnut leaves and 77% for meddler leaves.
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  • Tuesday, July 1, 2003
  • Removal of zinc from aqueous solutions by dry plant leaves
  • Published at:Not Found
  • Removal of zinc from aqueous solutions by 15 species of plant leaves was studied. The maximum efficiency of removal was found to be by walnut and poplar leaves at pH 6 with a maximum removal of 82%. Increasing the concentration of plant leaves increased the removal of zinc up to a limit. Agitation of solution increased the efficiency of the removal process. The presence of competing and complexing agents affected the removal process negatively but also positively in few cases.
    Source: PROCESS SAFETY AND ENVIRONMENTAL PROTECTION    Volume: 81    Issue: B4    Pages: 236-242    Published: JUL 2003  
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  • Sunday, July 1, 2001
  • Levels of trace metals and effect of body size on metal content of the landsnail Levantina hierosylima from the west bank-Palestine
  • Published at:Not Found
  • Levels of four trace metals (Cu, Zn, Cd and Pb) were determined in the landsnail Levantina hierosylima from four locations in the West Bank. Average concentration of the metals was 126.9, 42, 20.2 and 19.4 ppm for Cu, Zn, Pb and Cd, respectively. Significant differences in metal concentrations were observed between snails from the four sampling sites (Jerusalem, Abu-Dies, Qarawa, and Taibeh). Differences are most probably due to atmospheric fallout of metals from traffic roads and industrial facilities. Effect of snail size (weight and shell width) on metal content was investigated for the four metals. Plotting metal content against soft tissue weight resulted in significant relationships. Small snails were found to be richer in Zn, Cd and Pb than larger ones. Regression coefficients for the relationships were 0.75, 0.76 and 0.81 for Pb, Cd and Zn, respectively. Copper content was directly related to body weight (regression coefficient = 0.96) indicating that Cu concentration is independent of body weight. Pl
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  • Tuesday, May 1, 2001
  • Concentrations of heavy metals in roadside soils, plants, and landsnails from the West Bank, Palestine
  • Published at:Not Found
  • Concentrations of Cu, Cd, Pb and Zn were determined in roadside soil, plant and landsnail samples along Nablus-Ramallah main road in the West Bank. Average concentrations (μg.g-1, dry weight) of the four metals in soil samples were, Cu: 23.8, Zn: 128.3, Cd: 0.45 and Pb: 149.9. These values were higher than those found in soil samples collected from control sites. Metals in roadside plant samples were within normal levels although plants from control sites were found to have slightly less metals. Different parts of a plant (roots, stem & leaves) were found to accumulate metals in different concentrations. The average concentration (μg.g-1) of metals in different plant parts were: Cu: <5.2, Cd: <1.0, Pb: <2.19 and Zn: <5.18. Average concentrations (μg.g-1) of metals in the three roadside snails were ranging between 121-132 for Cu, 18-27 for Cd, 21-24 for Pb and 43-69 for Zn. Snails were found to magnify Cd to serious levels (>30-50 times higher than in plants and soils). Lead in snai
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  • Monday, January 1, 2001
  • Removal of Dissolved Copper from Polluted Water Using Plant Leaves. 11. Effects of Copper Concentration, Plant Leaves, Competing Ions and Other Factors
  • Published at:Rev. Int. Contam. Ambient. 17 (3) 123-1 27, 2001
  • Factors affecting copper removal from polluted water by poplar (Populus euphratica) leaves were investigated and a mechanism for copper removal was suggested. Increasing the amount of leaves from 5 to 25 g/L increased the rate and hence the amount of copper removed. Increasing the concentration of copper in solution from 2 to 20 mg/L caused a corresponding increase in copper uptake per unit weight of leaves at a constant leaf concentration of 20 g/L. The uptake of copper ions by poplar leaves was found to be noticeably affected by the presence of other metal ions. The effect of these ions could be dependent on the relative affinity of leaves to these ions and copper as well as to pH. Depending on the initial concentration, the presence of the chelating agent EDTA in the solution considerably reduced the rate and amount of copper uptake. Fresh leaves were found to uptake much less copper than dry leaves. Rough-crushing or fine-grinding of leaves slightly affected copper uptake. Agitation slightly increased the
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Radi Dauod
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