Preconcentration of Copper Ions from Aqueous Solution using EDTA Modified Prunus Dulcis L. Peels and Determination by FAAS

Abstract

In recent years, natural wastes such as cheap and abundant fruit and vegetable peels, which are called agricultural wastes, have been used as an effective biosorbent in the removal and preconcentration of metal ions due to the storage problems they cause in nature. In this study, Prunus Dulcis L. peels, a low-cost biosorbent as an agricultural waste, modified with ethylenedinitrilo tetra acetic acid (EDTA) were used for the preconcentration of copper ions from aqueous solutions and for the determination by atomic absorption spectrometry. Scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR) analyzes were used for the characterization of the prepared biosorbent. As the preconcentration method, the solid phase extraction method was studied in the column system and parameters such as pH, eluent solution, column flow rate, sample volume were optimized. The mean recovery and relative standard deviation (RSD) values were found to be as 99.4±1.4% and 2.23% for Cu(II) ions. Langmuir and Freundlich isotherm graphs were drawn to determine the capacity of the biosorbent. The highest biosorbent capacity for copper ion was calculated as 34.60 mg g-1 for raw Prunus Dulcis L. peels and 42.19 mg g-1 for EDTA modified Prunus Dulcis L. peels from the Langmuir isotherm model.

EDTA ile Modifiye Edilmiş Prunus Dulcis L. Kabukları Kullanılarak Bakır İyonlarının Sulu Çözeltiden Zenginleştirilmesi ve FAAS ile Tayini

Abstract

Son yıllarda, tarımsal atık olarak adlandırılan, ucuz ve bol miktarda bulunan meyve ve sebze kabukları gibi doğal atıklar, doğada oluşturdukları depolanma sorunları nedeniyle, metal iyonlarının gideriminde ve zenginleştirilmesinde etkili bir biyosorbent olarak kullanılmaktadır. Bu çalışmada, tarımsal bir atık olarak, düşük maliyetli bir biyosorbent olan Prunus Dulcis L. kabukları, etilendinitril tetra asetik asit (EDTA) ile modifiye edilmiş, sulu çözeltilerden bakır iyonlarının zenginleştirilmesi ve atomik absorpsiyon spektrometresi ile tayininde kullanılmıştır. Hazırlanan biyosorbentin karakterizasyonunda taramalı elektron mikroskobu (SEM) ve fourier dönüşümlü infrared spektroskopisi (FTIR) analizleri kullanılmıştır. Zenginleştirme yöntemi olarak katı faz özütleme yöntemi kolon sisteminde çalışılmış, pH, geri alma çözeltisi, kolon akış hızı, örnek hacmi gibi parametreler optimize edilmiştir. Ortalama geri kazanım ve bağıl standart sapma (RSD) değerleri Cu(II) iyonları için %99,43±1,14 ve %2,23 olarak bulunmuştur. Biyosorbentin kapasitesinin belirlenmesi amacıyla Langmuir ve Freundlich izoterm grafikleri çizilmiştir. Bakır iyonları için en yüksek biyosorbent kapasitesi Langmuir izoterm modelinden ham Prunus Dulcis L. kabukları için 34,60 mg g-1 EDTA ile modifiye edilmiş Prunus Dulcis L. kabukları için ise 42,19 mg g-1 olarak hesaplanmıştır. Yöntemin doğruluğunu teyit etmek için sertifikalı referans madde (ERML-CA021a) analizi yapılmış ve kantitatif sonuçlar elde edilmiştir.

Keywords

• Katı faz özütleme
• Bakır
• Eser element
• Prunus Dulcis L. kabukları
• EDTA
• Zenginleştirme

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