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تقنية استخلاص نقطة الغيمة لفصل واغناء المغنيسيوم (II) والخارصين (II) والنيكل (II) على هيئة ايونات سالبة وتقديرها طيفيا في نماذج بيئية وحياتية مختلفة == Cloud Point Extraction Method For Separation And Preconcentration of Mg 2+,Zn 2+,Ni 2+as Anions And Their Spectrophotometric Determination In Environmental And Vital Samples
Author name:
اباء عدنان عزوز المحنه
Supervisor name:
شوكت كاظم جواد
General topic:
Chemistry
Specific topic:
Chemistry
Degree:
Master
University:
University of Kufa - College Of Education For Girls - Chemistry Department
Language:
Arabic
University location:
Najaf
First pages:
25T1515 - p.pdf
Abstract:
قد استعملت تقنية CPEعلى مدى واسع من التطبيقات في اغناء وفصل واستخلاص العديد من المركبات البايلوجية والدوائية والمركبات العضوية والعديد من الايونات الفلزية على هيئة معقدات سالبة اوموجبة في محاليلها المائية.وتعد من التقنيات المهمة والسهلة والرخيصة والصديقة | Cloud point extraction CPE methodology is wide spread used for applications to separation or Preconcentration and extraction of many medic mental or biological compounds as well as organic compounds and several metal ions as negative or positive and neutral complexes for aqueous solutions, as well as this method considers an easy, cheap and important technique and one application of green chemistry with high sensitivity which isn’t use organic solvents. This study is an application for CPE methodology for extraction, separation and preconcentration of magnesium (II), zinc (II) and nickel (II) from aqueous solutions as anions coupled with spectrophotometric method for determination these metals in different vital and environmental samples. And the major thought of this study is to change the metal ion to anion complex in aqueous solutions, and then extracted as ion pair association complexes after combination with large suitable complexing agent and using surfactant as additional phase to extract ion pair association complexes formed and in this study surfactant TritonX - 100 was used. This study include extraction of Mg (II) as anion complex with Oxine [Mg (OX3) - ] after combination Mg2+with Oxine produced from 8 - hydroxy qunoline in basic solution NaOH, afterward formed ion pair association complex with Rhodamin - B.The first step in this study is the definition (?max ) for ion pair association complex formed and extracted spectrophotometricaly. The study show ?max was 648 nm according to mechanism below : Mg2+ + 3 OX - Mg (OX) 3 - Rhb+; Cl - + Mg (OX) 3 - [Rhb+; Mg (OX) 3 - ] + Cl Cloud point extraction CPE method is one of indirect method of extraction to submit to thermodynamic equilibria which is control extraction method.This study demonstrate (50µg/10 mL) giving best extraction with higher activity as well as this method need 0.08 M 8 - HQ for extraction, as well as 0.5 M NaOH to produce Oxine from 8 - HQ as well as need 1×10 - 4 M Rhodamine - B for favorable activity of extraction. Extraction of zinc (II) according to CPE method, by using PANN as new complexing agent prepared in this study to produce ion pair association complex in HCl media after change Zn2+ to ZnCl3 - , ZnCl4= , spectrophotometricaly show ?max = 414 nm for ion pair association complex formed and extracted. According to equilibria below : PANN + 2 HCl [2H - PANN] 2+; 2Cl - PANN + HCl HPANN+; Cl - Zn2+ +3 HCl - ZnCl3 - + 3H+ Zn2+ + 4 HCl ZnCl4= or HZnCl4 - + 3H+ or 4H+ HPANN+; Cl - + ZnCl3 - HPANN+; ZnCl3 - + Cl - HPANN+; Cl - + HZnCl4 - HPANN+; HZnCl4 - + Cl - [2H - PANN] 2+; 2Cl - +ZnCl4= [2H - PANN] 2+; ZnCl4= +2Cl - Hydrochloric acid HCl media play a major rule for change metal cation Zn2+ into anion complex ZnCl3 - or ZnCl4= , then study demonstrate 1M was optimum concentration of HCl giving higher activity of extraction Zn2+ with (20µg/10 mL). Extraction of nickel (II) according to CPE method by used DB18C6 with mechanism of extraction below : Ni2+ + 3H+Cl - NiCl3 - + 3H+ Ni2+ + 4 H+Cl - NiCl4=+ 4H+ Na+Cl - + DB18C6 [NaDB18C6] +; Cl - [NaDB18C6]+; Cl - + NiCl3 - [NaDB18C6] +; NiCl3 - + Cl - [NaDB18C6]+; Cl - + HNiCl4 - [NaDB18C6] +; HNiCl4 - + Cl - Higher activity of extraction was by use of 0.5 M HCl, 0.25 M NaCl, Ni2+ (50µg/10 mL) as well 1×10 - 4 M DB18C6. With study the effect of crown ethers and cryptand kinds. Which include thermodynamic and applications for spectrophotometric determination of these metals in different samples.
