Risk Evaluation of Heavy Metals and Metalloids Toxicity through Polluted Vegetables from Waste Water Irrigated Area of Punjab, Pakistan: Implications for Public Health

ABSTRACT

Rapid urbanization has no doubt provided prosperity to inhabitants but on the other hand, it has caused severe environmental problems, particularly soil and water pollution. This research was done to determine the magnitude of metal and metalloid contamination at two sites in soil and a potential vegetable crop, sponge gourd (Luffa cylindrica L.) irrigated with wastewater in the region of Sargodha, Pakistan. The results demonstrated that the metal and metalloid levels in the soil samples were relatively below the respective maximum permissible limits of various metals analyzed. Transfer factor for metal contents was greater at site-II than that observed at site-I. Health risk was also worked out due to the inhabitants' intake of L. cylindrica irrigated with municipal wastewater. At both sites, the health risk index was greater than 1 due to Mn, Mo, Pb, Cd, Cu and As, and Ni at site-1 and Zn at site-II, whereas less than 1 due to Fe, Se, and Co. It was concluded that the dietary intake of L. cylindrica was not free of risk for inhabitants around the sampling sites. To reduce the health risk effects, it is suggested to treat the industrial wastes properly and phyto-extract the overload of heavy metals and metalloids from polluted sites. But with increase in vegetable consumption by the community the situation could worsen in the future.

Key Words:

• heavy metals
• vegetables
• quality control
• health risk index
• transfer factor
• sewage water