CHELATING EXTRACTION AND SPECIATION OF CADMIUM FROM SOIL USING EDTA SALTS

Abstract

Soil washing is one of relatively simple and useful technologies for ex situ remediation of heavy metalscontaminated soils. In present study, initial total cadmium concentrations were maintained at 10 and 50 mg/kg in two different soil types. The use of different salts of EDTA on removal Cd of contaminated soils was evaluated with washing treatment methods. Batch washing experiments were conducted with Na2EDTA, FeEDTA, and ZnEDTA at different concentrations (0.01, 0.05 and 0.1 M) and solid (m) to liquid (v) ratios (1:5, 1:10, and 1:20). Results showed that the removal efficiency of Cd from soil increased with increasing EDTA concentrations, and the efficiency of chelating agents in the order Na2EDTA ≥ ZnEDTA > FeEDTA. In addition, speciation of Cd-EDTA complexes in the soil was evaluated with FITEQL program

Keywords

• heavy metal removal, cadmium, soil washing, EDTA, speciation

KADMİYUM’UN KİRLENMİŞ TOPRAKLARDAN EDTA TUZLARIYLA EKSTRAKSİYONU VE SPESİASYONU (TÜRLENDİRMESİ)

Abstract

Toprak yıkama, diğer teknolojilerle kıyaslandığında ağır metallerle kirlenmiş toprakların arıtımı için basit ve kullanışlı bir teknolojidir. Bu araştırmada, 10 ve 50 mg/kg kadmiyum (Cd) ile yapay olarak kirletilmiş farklı tekstüre sahip iki topraktan, maksimum metal giderim verimini sağlayacak optimum yıkama koşulları, etilendiamin tetra asetik asit (EDTA)’nın farklı tuzları kullanılarak belirlenmiştir. Kesikli desorpsiyon testleri; NaEDTA, FeEDTA ve ZnEDTA’nın farklı derişimlerinde (0.01, 0.05 ve 0.10 M) ve farklı toprak:çözelti oranlarında (1:5, 1:10 ve 1:20) gerçekleştirilmiştir. Çalışma sonunda topraktan Cd gideriminin artan EDTA derişimleri ile arttığı, kullanılan şelatlayıcı ajanların Cd giderim verimliliğinin sırasıyla Na2EDTA ≥ ZnEDTA > FeEDTA olduğu belirlenmiştir. Ayrıca topraktaki Cd’nin EDTA ile yaptığı komplekslerin spesiasyonu (türlendirme) FITEQL programıyla değerlendirilmiştir

Keywords

• ağır metal giderimi, kadmiyum, toprak yıkama, EDTA, türlendirme

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