Accumulation of Heavy Metals in Soil and Their Transfer to Tissues of Azadirachta indica Collected from Akungba-Akoko, Nigeria

Cadmium, cobalt, iron, lead, and zinc levels were measured in tissues (roots, leaves, and stems) of Azadirachta indica collected at various locations in Akungba-Akoko, Nigeria (Nigeria). The elements’ transfer coefficients into plant tissues were also calculated in order to quantify differences in bioavailability among plant species. The tissues were acid-digested and flame atomic absorption spectrophotometry was used to study them. The following heavy metal amounts (ppm) were found in the plant’s roots, leaves, and stems: Cd (0.14 – 0.34, 0.09 – 0.20, 0.09 – 0.33); Co (4.01 – 5.48, 3.22 – 5.14, 3.84 – 5.40); Fe (82.27–137.98, 49.20–160.10, 58.33–116.62); Pb (0.50–0.57, 0.33–0.97, 0.28–0.48); and Zn (52.07–149.94, 52.01–113.73, 49.58–127.05.) In all tissues studied, Fe has the highest concentration, while Cd has the lowest. The plant’s stems had the lowest bioaccumulation of most metals tested, making them ideal for medicinal use. Pb Cd Zn Fe Co Pb Cd Zn Fe Co Pb Cd Zn Fe Co Pb Cd Zn Fe Co Pb Cd Zn Fe Co Pb Cd Zn Fe Co Pb Cd Zn Fe Co Pb Cd Zn Fe Co Pb Cd Zn Fe Co Pb Cd Zn Fe Co Pb Cd Zn Fe Co Pb Cd Zn Fe Co P Since plant absorption of heavy metals is a major source of human exposure via the food chain, vegetative sections of Azadirachta indica used for therapeutic purposes should be harvested well away from highways to minimize or eliminate health risks associated with heavy metal ingestion.

Author (s) Details

B. A. Falusi
Department of Chemistry, Federal College of Education (Special), P.M.B. 1089, Oyo, Nigeria.

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