Title of article :
Threat of Copper, Zinc, Lead, and Cadmium in Alfalfa (Medicago scutellata) as Livestock Forage and Medicinal Plant
- - نويسنده Assistant Professor, Department of Environment, Faculty of Natural Resources and Environment, Malayer University, Malayer, Hamedan, Iran Solgi Eisa , - - نويسنده Department of Environment, Faculty of Environment and Energy, Islamic Azad University, Science and Research Branch, Tehran, Iran Shahverdi Nick Mehdi , - - نويسنده Assistant Professor, Department of Horticulture, Faculty of Agriculture and Natural Resources, Arak University, Arak, Iran Solgi Mousa
Background: Concentrations of 4 toxic metals, viz. Cd, Cu, Pb, and Zn in the soil and alfalfa samples collected from Borujerd, Iran, was determined. The capability of alfalfa to accumulate heavy metals from soils was assessed in terms of Biological Concentration Factor.
Materials and Methods: The alfalfa and soil samples were collected from 20 different farms, including 13 wastewater-irrigated and seven underground-irrigated farms. After acid digestion, the samples were analyzed using atomic absorption spectrophotometer.
Results: The levels of Cd, Pb, and Zn in the soils of wastewater-irrigated farms were higher than those from the groundwater-irrigated farms. With the exception of Cu, concentrations of heavy metals in the alfalfa crop were higher in wastewater-irrigated farms compared to well water. Also, in the case of BCF, both Cd and Cu values decreased with increasing metal concentration in soil. The order of BCF of heavy metals in alfalfa was in order of Cu>Cd>Zn>Pb in well water-irrigated and Zn>Cd>Cu>Pb in wastewater –irrigated samples.
Discussion and Conclusions: The findings remarked that the levels of Cu, Cd, and Pb in alfalfa were exceeding the permissible levels suggested by the Joint FAO/WHO Expert Committee on Food Additives. These outcomes propose that the consumption of alfalfa plants is potentially threatening both animal and human health.