Chelate Modified B-CDP as a Green and Economical Sorbent for Separation and Preconcentration of Co(II)

يك روش حساس و ساده براي تعيين مقادير ناچيز يون كبالت با استفاده از روش اسپكتروفتومتري فرابنفش-مريي توسعه داده شد. پليمر بتا سيكلو دكسترين اصلاح شده با ليگاند 1-(2-پيريديل آزو)-2-نفتول براي پيش تغليظ يون كبالت از نمونه هايي با 8.5=pH مورد استفاده قرار گرفت. پليمر تنتر شده با روشهاي مختلف آناليز عنصري، اسپكتروفتومتري مادون قرمز و ميكرسكوپ الكتروني پويشي مشخصه يابي شد. فاكتورهاي مختلف براي مرحله جداسازي و پيش تغليظ و اندازه گيري مورد بررسي قرار گرفت. در نهايت حد تشخيص در حد 4.2 نانو گرم و ميلي ليتر براي اندازه گيري يون كبالت بدست آمد. روش حاضر به طور موفقيت آميزي براي اندازه گيري كبالت در نمونه هاي مختلف آلياژها، سبزيجات و نمونه هاي آبي مورد كاربرد قرار گرفت.

A simple and sensitive method has been developed for the preconcentration and determination of trace level of Co(II) using UV-Vis spectrophotometry. B-Cyclodextrin polymer modified with 1-(2-pyridylazo)-2-naphthol (PAN) is used for the preconcentration of Co(II) from samples at pH 8.5. The polymer is synthesized and characterized using elemental analysis, FT-IR and SEM analysis. The factors affecting the recovery of Co(II) such as pH, adsorbent dose, contact time, sample volume, eluent concentration and volume are also optimized in order to achieve higher sensitivity. The recoveries of Co(II) are found to be 95% and the relative standard deviation found by analyzing 3 replicates is ?2.9. The preconcentration factor is found to be 100. The limit of detection (LOD) determined as (3?) is found to be 4.2 ng/ml and limit of quantification (LOQ) determined as (10?) is found to be 14 ng/ml. The recoveries achieved by addition of Co(II) at known concentrations to samples and analysis results show that the described method has a good accuracy. The proposed method is applied to water, vegetable and alloy samples successfully.