College of Science/ University of MosulRafidain Journal of Science1608-939129120200301Identitying The Absorbtion Range of Chara sp. Algae for Different Concentrations of Cadmiumمعرفة مدى امتصاص طحلب Chara sp. لتراکیز مختلفة من عنصر الکادمیوم264016447910.33899/rjs.2020.164479ENAbdul Sattar J. Z.Al- HayaniDepartment of Environmental Technology/ College of Environmental Sciences and Technology / University of MosulAbdulmoneim KannahDepartment of Biology / College of Science / University of MosulHIba KhaleelDepartment of Biophysics Science / College of Science / University of MosulJournal Article20190630 The adsorption of the cadmium element ion was used by the Chara sp., where it was dried and the effective groups of algae responsible for adsorption using infrared (FTIR) were COOH , (C=O) and aliphatic nexus (C-H), in addition to the presence of groups with a negative charge such as (OH), (P = O), (CO<sub>3</sub>), (CH<sub>2</sub>), (Cl) and (Br) on the surface of the algae, and taking them at a weight of 2 g and treated with a series of different concentrations (0,5,10,20,40,100) mg.L<sup>-1</sup> of Cadmium ion where incubation coefficients at (298°) Kelvin,<br /> After the incubation period, the stabilizers were extracted and Cadmium was quantified with mathematical description according to the equations of the single-surface (Langmuir, Freundlich, Temkin, Dubinin and Polani) respectively for Cadmium, It was found that the values of the coefficient of determination were effective for all equations, which gives a clear indication of the possibility of using any of these six equations. However, the two-sided Langmuir equation is the most efficient in the mathematical description of adsorption. Moreover, this equation showed a very large correlation between the actual adsorption values and the calculated values of this equation because they have the lowest standard error (SE) (0.0001) and the highest coefficient of determination (R<sup>2</sup>) (1.00), which gains the advantage in the mathematical description on the rest of the equations. The maximum adsorption capacity (Xm) on the first and second surfaces (1.28) and (169.49) mg. Kg <sup>-1</sup> respectively, while the binding capacity (K) on the first and second surfaces (186.62) and (29.50) L.mg<sup>-1</sup> respectively.<br /> <br /> https://rsci.mosuljournals.com/article_164479_f12ee7ec3d89dda63f88b8e0055503eb.pdf