This paper presents the concentration of Cu, Zn, Fe, Pb and Cd in vegetables, soil and water samples. Samples were collected from Mayham (Adigrat, Tigray region). Total acid (7ml mixture of HNO3, H2SO4, HClO4) digestion method was employed and determination was made by flame atomic absorption spectroscopy. The percentage recoveries of the metals were in the range of 89% to 100% in vegetable, 84% to 100% in water and 82% to 103% in soil sample. The range of concentration(µg/g) of the metals on dry weight basis are: Cd 1.18-1.45 in vegetables, 1 in soil and 9 in water; Cu 9-18 in vegetables, 15-17 in soil and 4.3 in water; Pb 1.67-5.01 in vegetable, 3-5 in soil and 2.6 in water; Zn 40-398.5 in vegetable, 59-66.8 in soil and 9.2 in water; Fe 218.25-4987.5 in vegetables, 23705.75 – 29248.5 in soil and 177.5 in water sample. The result obtained imples that the plant is rich in iron, zinc and copper and has small concentration of non-essential trace elements like lead and cadmium.
The effluent water of any industries such as textile, leather, paper, printing, cosmetic, etc. contains large amount of hazardous dyes. There is a huge number of treatment process as well as adsorbent which are available in low cost adsorbents for the removal of hazardous dyes from aqueous waste by adsorption treatment. In this study, thermally treated egg shell was used as an adsorbent for the removal of methyl orange from an aqueous solution. All operating parameters like; adsorbent dose, contact time, particle size and initial concentration of methyl orange were effective on their removal efficiency of the dye.
The investigation was carried out a qualitative test for the possible phytochemical components (Alkaloids, Phenolic compound, Quinone, Protein, Anthraquinones, Saponins, Coumarin, Flavonoids, Tannin Fixed oil and fats and Steroid-glycosides) and quantitative analysis for some selected physicochemical properties after extracting the sample using soxhlet extraction by using ethanol and methanol as extractants. And Phenolic compound, Tannins, flavonoid and Steroid-glycosides are intensively found in the plant but Anthraquinones, protein and fixed oil and fat were not found even in a minimum amount. The medicinal use of Moring is results from the presence of some active phytochemical constituents. Lastly the physic-chemical properties value is investigated as follow: Moisture content 0.032% Total ash value 96 % Saponification value 37.4, Refractive index for Ethanol and methanol extract are 17,7 , Acid value 3.94 and the extract is Insoluble in chloroform but highly soluble in Ethanol, Diethyl ether and Water.
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