Affiner votre recherche
Résultats 1-2 de 2
Strategies for productive use of brackish water for sustainable food grain production in dry regions
2003
Zia, M.H. | Ghafoor, A. | Boers, T.M.
Due to unavoidable, prolonged irrigation with marginal quality water, secondary salinization of irrigated soils in Pakistan has necessitated to a need for better understanding of the water management alternatives
Afficher plus [+] Moins [-]Study of metallic pollutants in water and food items of an industrial city by atomic absorption spectrophotometry
2003
Khan, M.H. | Yasmin, N. (University of Azad Jammu and Kashmir, Muzaffarabad (Pakistan). Dept. of Chemistry)
To evaluate the base line levels of potentially toxic and essential trace metals namely, Cd, Ph, Cr, Mn, Ni, Cu and Zn in water, locally grown vegetables, cereals and vegetable ghee-oil samples of a highly industrial city Gujranwala have been measured after wet digestion by employing AAS technique. Sampling was made from selected sites in and around the city over a period of three months. The concentration of Mn, Ni, Zn, Cu and Pb was found significantly higher in vegetables ranging from 3-63, 2-81, 5-92, 7- 70 and 6-60 ppm respectively. Nickel and Cu concentration was found higher in cereals whereas, Cd was found at ppb level in all variety of samples studied. Tap water, vegetable ghee-oil have recorded lower concentration of these metals. Vegetables collected from urban area have shown elevated level of contamination than those of taken from canal irrigated farms. The overall level of trace metals with few exceptions of vegetable samples was found within the permissible limits fixed by WHO. The analytical method was checked by applying on SRM of wheat and spinach. The results were found in agreement with the certified values within experimental error. The major polluting sources of the city such as automobile, man made activities, soil and road dust, metallic corrosion and industrial activities have been indicated. The environmental impacts of pollutants on water and food quality of an industrial and non-industrial city are briefly discussed in the light of their adverse effects on human health.
Afficher plus [+] Moins [-]