This study was conducted to analyze the metals in selected vegetables available in Powai area, Mumbai, India.The total 9 samples viz., 5 vegetables, 3 cereals and 1 medicinal plant were collected which are commonly consumed in the locality. These were digested using microwave acid digester with nitric acid and hydrochloric acid and analyzed with the aid of ICP-AES to determine toxic metals. Highly toxic metals such as arsenic and silver were below detectable limit while two of the samples had high mercury and lead content. The results obtained were compared with their permissible levels set by the FAO and WHO and were found to be within safe limits for some metals while concentrations of some of the metals were much greater than permissible limits and were, hence, not safe to consume. It was found that the overall toxic metal accumulation was greater in leafy vegetables viz. spinach, coriander and tubers such as potato.
Thermal power plants are the major source of electricity generation in India and most of them use pulverized coal as the fuel producing enormous quantities of coal fly ash every year. The method of disposal adopted is by wet sluicing in on-site fly ash ponds. This disposal in the form of dilute slurry has a high potential for leaching into the surrounding soil and groundwater. The coal fly ash contains trace metals like As, Cr, Zn, Cd, etc which are toxic in nature and thus, the wet disposal of coal fly ash has serious environmental concerns. This paper assesses the leaching potential of coal fly ash from six thermal power plants in Maharashtra, India. The maximum leachable quantities of some trace metals present in coal fly ash are computed by a Sequential Extraction Procedure (SEP) and results are compared with values obtained by Toxicity Characteristics Leaching Procedure(TCLP).
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