الخلاصة

Three organic reagents were synthesized 2-[4-bromo-3,5-diethyl phenyl azo]-4,5diphenylimidazole(BDPI) , 2-[(4-Benzyloxy phenyl)azo]-5-nitro-4- phenyl imidazol (BANI) , 4-[N-(5-methylisoxazol-3-yl)benzene sulfonamide azo] -1- Naphthol (AMBN) ,which are utilized for separation , extraction and spectrophotometric determination Zinc(II) ,Lanthanum(III) and Cerium(III) as cations according to liquid-liquid extraction method , depending on the measurement of absorption of ion pair complex extracted at maximum wavelength (max )and calculation distribution ratio (D). This study involves limitation of optimum conditions for complex formation as well extraction as pH. as well the experiment showes optimum pH for extraction Zn(II) with [(BDPI), (BANI),(AMBN)] (pH=8,9,9) respectively but for La(III) was (pH=11,10,10) with [(BANI) ,(BDPI), (AMBN)] respectively as well (pH=9,9,8) for Ce(III) with [(AMBN) (BDPI) (BANI)] . The study about metal ions concentration effect on extraction methods illustrates 50μg/5mL Zn2+ appropriate concentration obtaining higher absorbance for ion pair complex extracted to organic solution as well higher distribution ratio (D) with all organic reagents , and for La3+ was 80μg/5mL with all organic reagents also 100μg/5mL Ce3+ all organic reagents. Kinetic energy has significant role in extraction. method according to liquid - liquid extraction , as well the study show effect of shaking time of two layers on qualify of extracted and explains 10 min which were appropriate shaking time for Zn(II), La(III) and Ce(III) with all organic reagents to give higher distribution ratio (D) as well higher absorbance of ion pair complex extracted to organic phase.