Main Article Content
The concentration of nine different elements including heavy metals were analyzed in selected medicinal plants i.e. Haloxylon griffithii and Convolvulus leiocalycinus. The mineralization of plant samples was done using wet digestion method in which three strong acids were used i.e. nitric acid (HNO3), sulphuric acid (H2SO4) and perchloric acid (HClO4) followed by filtration and analyzed through flame atomic absorption. For sodium and potassium, flame photometer was used and samples were diluted to 100 folds for obtaining results within the range of the instrument. The decreasing order of concentration of elements in H. griffithii was K>Na>Fe>Ni>Mn>Cu>Co>Pb>Cd whereas, in C. leiocalycinus was K>Na>Fe>Cu>Mn>Ni>Co>Pb>Cd. The study revealed that heavy metals accumulate in the plants with different concentrations and their concentrations were within the permissible ranges established by international organizations. This will provide knowledge in the invention of many new drugs and the research helps the legislators to provide protection to the public regarding adverse effects of heavy metals.
Keywords: Flame atomic absorption; Flame photometer; Flame emission