SEEU Review vol. 5 Nr. 2 (pdf) - South East European University

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Fatmir Faiku, Haxhere Faiku, Murtezan Ismaili, Arben Haziri and Sevdije Govori considered as a prerequisite that enables the controlled extraction of an element. Abstrakt Ky punim paraqet vazhdimësi në hulumtimet tona për aplikimin e anion këmbyesve të lëngët për ekstraktimin multielementar nga përzierja e elementeve të përgatitur në mënyrë artificiale. Është hulumtuar selektiviteti i mjeteve ekstraktuese dhe janë përcaktuar parametra të cilët ndikojnë në ekstraktimin solvent, efikasitetin e ekstraktimit dhe për mundësinë e aplikimit të tyre në përcaktimin analitik të elementeve. Në mënyrë të detajuar është hulumtuar ndikimi i përqendrimit të HCl dhe i përqendrimit të kripërave KCl, KI dhe CH 3 COONa në ekstraktimin e elementeve nga tretësirat ujore. Përqendrimi i kripërave të tretura në tretësirat ujore të acideve përmbajnë parametra të rëndësishëm të cilët dukshëm mund të ndikojnë në përqindjen e elementeve të ekstraktuar. Kjo mund të merret, si një nga kushtet që na mundëson ekstraktimin e kontrolluar të ndonjë elementi. Абстракт Овој труд представува продолжение на насите истражувања за примена на течните јонизменувачи за екстракција на на поедини елементи од смеса. Тука се испитува селективноста и се одредени параметрите који влијаат на ефикасноста на ектракцијата како и можноста за нивна практична примена за аналитичка идентификација. Подробно е испитувано влијанието на концентрацијата на HCl и на концентрацијата на солите KCl, KI и CH 3 COONa при екстракција на елементите од водениот раствор. Констатирено е дека концентрацијата на солите има сигнификантно влијание на количината на елементок кој се екстрактира. Ова воедно представува услов за контролирана екстракција на некој елемент. Introduction Organic molecules capable of complexing with metal ions will increasingly become the method of choice for metal ion recovery from hydrometallurgically generated solutions. 1-6 Thus, these organic compounds, generally referred to as liquid ion exchange extractants, or solvent extractants, have dominated these recovery processes. This has been largely 214
<strong>SEEU</strong> <strong>Review</strong> Volume 5, No. 2, 2009 due to their excellent selectivity for the targeted metal ion and the very rapid kinetics exhibited by these reagents. Alkylamine extractants have been one of the major classes of solvent extraction reagents since the inception of solvent extraction as a large-scale hydrometallurgical technique. 7,8 Numerous amine compounds of all three classes have been screened and evaluated as extractants for inorganic species. 9-13 Experience has shown that for practical solvent extraction applications, an amine has to fulfill certain basic requirements, such as compatibility with a practical diluent, sufficient extraction power, rapid phase separation, low aqueous solubility and sufficient chemical stability. Although exceptions are known, usually only saturated nitrogen compounds fulfill these requirements of a useful extractant. 14 Solvent extraction by high molecular weight organic bases has become increasingly popular in recent years in studying metal complexes. The main interest of metal extraction by the reagents reviewed in the forthcoming sections lies in their selectivity towards anionic metal complexes, reversibly formed in an aqueous solution, rather than towards simple anions. The extraction by high molecular weight amines is considered to take place by the formation of an ammonium salt, by the reaction: R 3 N + H + + A - R 3 NH + A - (1) R 3 N is a water-insoluble, high molecular weight tertiary alkylamine, and the amine salt R 3 NH + A - is a polar ion-pair with a high ion-association constant characteristic of ion-pairs composed of bulky unhydrated ions in a non-ionizing medium. The amine salt may undergo, under proper experimental conditions, an anion exchange reaction: R 3 NH + A - + B - R 3 NH + B - + A - (2) Bearing apparent similarity to the process on solid anion exchange resins. Materials and Methods In this work the selection of the elements for extraction was made from the table of elements where information can be found on extraction of the elements and their form whilst applying tertiary amine with high molecular mass. 15 Since the possibility of a wide exchange exists, we decided to extract 215
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Iranda Bajrami, MA kanë qenë të
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