(MAHNOOR, Islamabad)

Nickel (Ni) is widely distributed in nature and is found in animals, plants, and soil; the concentration of Ni in soil is approximately in the range of 4–80 ppm. Large amount of Ni is released in the atmosphere due to natural as well as anthropogenic activities including fossil fuel consumption, the industrial production (mining, smelting, and refining), use, and disposal of nickel compounds and alloys, and waste incineration.

In coastal sediments of the Arabian Sea along with the urban Karachi, the maximum concentration of 74 mg/kg Ni was found at the Lyari location at the most downstream part of the Malir River. In another study the second highest value of 56.46 mg/kg was found at Karachi Port Trust (KPT) Boat Building Area. In vegetables, the concentrations of Ni 30.1 mg/kg was observed in vegetables irrigated with sewage water in the suburbs of Peshawar city, KPK.

Human exposure to Ni results from Ni contaminated food ingestion, water, inhalation, and percutaneous absorption [98, 128]. According to International Agency for Research on Cancer evaluation, Ni compounds are carcinogenic to humans. Ni metal and compounds cause cancers of the lung and of the nasal cavity and para-nasal sinuses. High nickel concentrations in surface waters can diminish the growth rates of algae. Microorganisms can also suffer from growth decline due to the presence of nickel.

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30 Nov, 2017 Views: 288


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