Determination of Heavy Metal Contents in Some Medicinal Plants from Region of Oran from Algeria

Abstract Some of the heavy metals found in our environment are toxic; once absorbed by plants, they build up in tissues and are phased out. Other heavy metals are trace elements that are necessary for human health, but can be toxic in excessive concentrations. The purpose of this study is both to confirm the necessary metals' recognized medicinal virtues and to raise awareness of the presence of harmful non-essential metals that could harm humans and the environment. This study depicts a profile of existence of heavy metals (Zn, Cu, Cd, Pb, Fe) in some important herbal plants used in some parts of the country as a food condiment like (Moringa oleifera, Artemesia campestis, Nigella sativa, Asparagus stipularis, Sesamum indicum, Ruta montana, Rhamnus alaternus , Pistacia lentiscus using atomic absorption spectrophotometer. Heavy metals in these herbal plants were in the range of 0.38-0.56ppm of Zn, 0.00-0.69 ppm of Cu, 0.13-0.16 ppm of Cd, 0.26-0.52 ppm of Pb, 1.10-8.89 ppm of Fe. Of the eight medicinal plants/products examined, the prescribed limits were respected. For each plant, mineralize a test sample of 2 grams of powder. Each mineral is analyzed by injection. For each element, a calibration curve is generated. – Assay with atomic absorption devices (lead, copper, cadmium, nickel, manganese). The results are expressed in mg/L for different species. The highest value is: lead. Copper content is present in various extracts and is considered a good source. The zinc contained in Moringa is very valuable. The presence of iron in the species Rhamnus alaternus confirms its use in traditional medicine as an antianemic.