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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 32, Number 5
BKCSDE 32(5)
May 20, 2011 

Solvent Extraction, Preconcentration and Determination of Thorium with Monoaza 18-Crown-6 Derivative
I.Dolak, * M. Karakaplan, B. Ziyadano ullar , R. Ziyadano ullari
Thorium extraction, Determination, Preconcentration, Monoaza-18-Crown-6
A solvent extraction separation, preconcentration and determination of thorium with a new crown, 2-ethyl-Nbenzyl- 4,7,10,13,16-pentaoxa-1-azacyclooctadecane (MACE), is described in the study. The amount of thorium in the aqueous phase and organic phase was determined by Inductively Coupled Plasma-Optical Emission Spectroscopy and Ultraviolet-Visible, respectively. Thorium loaded organic phase was quantitatively stripped in a stage by using 1.0 M HNO3. Thorium was effectively extracted with MACE in the pH range of 6- 7 to produce a 3:2 complex ratio in the chloroform. A highly sensitive and rapid spectrophotometric method was described for determination of trace amounts of thorium with MACE. The effective molar absorption coefficient at 281 nm is 1.98 × 103 mol−1 cm−1, and the system complies with Beer’s law in the range from 0.464 to 2.32 μg mL−1 of thorium. Thorium was also determined in standard and environmental samples.
1564 - 1568
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