Keywords : Cadmium


Identitying The Absorbtion Range of Chara sp. Algae for Different Concentrations of Cadmium

Abdul Sattar J. Z. Al- Hayani; Abdulmoneim Kannah; HIba Khaleel

Rafidain Journal of Science, 2020, Volume 29, Issue 1, Pages 26-40
DOI: 10.33899/rjs.2020.164479

        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), (CO3), (CH2), (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-1 of Cadmium ion where incubation coefficients at (298°) Kelvin,
        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 (R2) (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 -1 respectively, while the binding capacity (K) on the first and second surfaces (186.62) and (29.50) L.mg-1 respectively.
 
 

Bioaccumulation Study of some Heavy Metals in Tissues and Organs of Three Collected Fish Species in Tigris River within Mosul City

Eman S. Al-Sarraj; Muna H. Janker; Sati M. Al-Rawi

Rafidain Journal of Science, 2014, Volume 25, Issue 4, Pages 43-55
DOI: 10.33899/rjs.2014.88657

The present study includes the determination of concentrations of some heavy metals (Lead Pb and Cadmium Cd) in muscles, liver and gills of the three economic fish species: Cyprinus carpia, Condrostoma regiumand Liza abu. These fishes were collected from three sites along sides of Tigris river in Mosul city, during spring 2011 to winter 2012.
The three sites along Tigris river were the entry of Mosul city (Mushirfa site) which is considered as control, Middle city (near the Iron old bridge) and the ending city (Albosaif site).
The aim of the study is to assess the accumulative levels of these metals in fish and their transporting in food chains till arrived to human body.
The results showed that the concentration rank of the metals in fishes followed the describing sequence: Albosaif site > middle city > Mushirfa site. Lead bioaccumulation in fishes tissues and organs followed the descending sequence: liver > gills > muscles.
The results also showed that cadmium bioaccumulation in fish tissues and organs followed the descending sequence: gills> liver > muscles. These highest values were refereed to variety in pollution sources with heavy metals in the river and made the fishes as a good pollution bioindicater.