Analysis of heavy metals in selected medicinal plants from dir,swat and peshawar districts of Khyber Pakhtunkhwa

Essential and non-essential heavy metals like manganese,zinc,iron,nickel,copper,chromium,lead and cadmium were analyzed quantitatively in selected medicinal plants including,acorus calamus,artemisia annua,chenopodium foliosum,cupressus arizonica,euphorbia helioscopia l,lepidium sativum,nerium oleander,ranunculus mariculatus,tecoma stans,urtica dioica by using atomic absorption spectrometry. the main purpose of this study was to quantify essential and non-essential heavy metals in selected herbs,which are extensively used in the preparation of herbal products and standardized extracts. the high conc. of iron,mn was found in nerium oleander26.52 mg/kg,94.40 mg/kg. zn in lepidium sativum 77.00 mg/kg and high conc. of k 94600 and na 400 mg/kg was found in tecoma stans. the concentration of other heavy metals particularly cu,ni and pb were also found in higher conc. in the selected herbs. the main purpose of the present study was to evaluate the contents of toxic metals and their concentration level which may have adverse effect on human health,besides providing a scientific data.