Spectrophotometric Determination of Thorium with Disodium Salt of Arsenazo-III in Perchloric Acid

M. Khan; A. Ali; N. Khan

doi:10.1023/a:1017968217578

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Journal of Radioanalytical and Nuclear Chemistry

Volume/Issue:: Volume 250: Issue 2

Spectrophotometric Determination of Thorium with Disodium Salt of Arsenazo-III in Perchloric Acid

Authors:

M. Khan

M. Khan University of Azad Jammu and Kashmir Department of Chemistry Muzaffarabad Pakistan

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A. Ali

A. Ali Pakistan Institute of Nuclear Science and Technology, P.O. Nilore Nuclear Chemistry Division Islamabad Pakistan

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, and

N. Khan

N. Khan University of Azad Jammu and Kashmir Department of Chemistry Muzaffarabad Pakistan

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Pages:: 353–357

Online Publication Date:: 29 Oct 2004

Publication Date:: 17 Nov 2001

Article Category:: Research Article

DOI:: https://doi.org/10.1023/a:1017968217578

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Abstract

A rapid and sensitive spectrophotometric method has been developed for the determination of thorium using 0.04% Arsenazo-III in a 2M perchloric acid solution. Absorbance was measured in 1 cm cell and the complex has a sensitive absorption peak at 654 nm. The complex is formed instantly in perchloric acid and remains stable for 45 minutes with constant absorbance. Beer's law is obeyed in the range 1–60 g·g^–1 of thorium concentration with a molar absorptivity at 654 nm = 3.07·10⁵ M^–1·cm^–1 at 24±2°C. The foreign ions interference in thorium determination have been checked. The cations were tested at >60-fold excess of thorium, Mn(II), Fe(III), Co(II) and Ni(II) interfere negatively, whereas only Ce(III) has increased the absorbance. Among the anions, cyanide, phosphate, thiocyanate and acetate at 150-fold excess of thorium cause significant interference. However, thorium can bedetermined in the presence of nitrate, chloride, oxalate, tartrate, ascorbate, thiosulphate and citrate. The method has been applied on certified reference material for thorium determination after extractive separation and the result was found in good agreement with the certified value. The method has been also applied successfully to determine thorium at g·g^–1 level in local ore samples with a precision of ±0.04%.

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Journal of Radioanalytical and Nuclear Chemistry

Print ISSN:: 0236-5731

Online ISSN:: 1588-2780

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Journal of Radionalytical and Nuclear Chemistry
Language	English
Size	A4
Year of Foundation	1968
Volumes per Year	1
Issues per Year	12
Founder	Akadémiai Kiadó
Founder's Address	H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher	Akadémiai Kiadó Springer Nature Switzerland AG
Publisher's Address	H-1117 Budapest, Hungary 1516 Budapest, PO Box 245. CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible Publisher	Chief Executive Officer, Akadémiai Kiadó
ISSN	0236-5731 (Print)
ISSN	1588-2780 (Online)