A no vel extra ction and preconcen tration o f ultra-trace level of uranium ion usi ng functionalized magnetic-nanoparticles prior to its deter mination by induc tively cou pled plasma-optical emission spectrom etry

New modified m agnetic nanoparticles functionalized with salicylaldehyde groups were design ed and synthesized for extraction/p reconcentration of sub-ppb level of uranium io ns in water samples prior to its d etermination with indu ctively coup led plasma optical emission spectrometry (ICP -OES). In t he separation process, a queous solu tion of U(VI ) ions was mixed with ۱ ۰۰ mg of F e۳O۴ magn etic nanopar ticles modified with salicylaldehy de (Sal) and then external magnetic field was a pplied for is olation of magnetic nan oparticles co ntaining ura nium ions. Experimental conditions for an effec tive adsorpt ion includin g pH, sample volume, eluent concentration and existing of co-existing ions have been studied and established. Und er the optimal extractio n and preconcentrationc onditions, the limit of detection ( LOD) of ۰. ۲۴ ng mLí۱and the relative standard deviation (R.S.D) of ۱.۵% (n = ۸) were achieved by ICP-OES. The analytical c rve was linear in the range ۱–۲۵۰۰ ng mL í۱.The sorp tion capacity of functionalized Fe۳ O۴ magnetite nanoparticles under optimum con ditions has been found to be ۲۶.۰ mg of uraniu m ion per g ram at pH ۸ with the p reconcentration factor of ۱۰۰۰ (۱ mL of elutio n for a ۱۰۰۰ mL samp le volume). The prop osed metho d is characterized with high enrichment factor, easy preparation and regeneration of sorbent, short time of s ample pretreatment, fast separation, high extra ction yield s, wide line ar curve a nd low detection limits. Finally, the proposed method wa s successfully used for extraction, preconcentration, and de termination of U(VI) in some real samples.

کلیدواژه ها:

Preconcentration ، uranium determinati on ، magneti c nanoparticles ، inductively coupl ed plasma-o ptical emissi on spectrom etry (ICP-O ES).