الفهرس 
Introduction and Aim of the WorkOnly 14 pages are availabe for public view
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Abstract
Block elements (lanthanide and actinide) are the most valuable elements in the periodic table. Despite their application in various scopes (Ex: medical, industrial, catalysts …. etc), their concentration in nature is considered very low. They are very similar in physical and chemical properties which led to a complicated matrix problem during their determination in different geological samples. So, the aim of this thesis is to enhance the separation and pre-concentration of some f block elements from sample matrices prior to their detection. The examined ligands (Quercetin, Morin and Aluminon) show promising efficiencies for removal of f block elements by CPE-based processes. The overall extraction procedures were rapid, simple, accurate and precise. The procedures obey the principles of green chemistry and termed as eco-friendly procedure because they minimize the use of toxic organic solvents.Quercetin was used for separation of Gd3+ from a bulk of lanthanides and actinides by CPE at pH 3.0. It can be also applied for preconcentration of La3+, Ce4+, Nd3+, Sm3+, Ho3+, Er3+, Th4+ and U6+ prior to ICP-OES determination.Aluminon was successfully utilized for CPE and spectrophotometric determination of Sm3+, La3+, U6+, Th4+ and Er3+ in environmental samples. Moreover, Sm3+ can be mostly separated from those elements at pH 2.5. Morin was used for CPE and determination of Th4+ in the presence of other f block elements. The procedure was carried out at room temperature in the presence of KI as salting out agent at pH 2.