Environmental analysis of thorium (IV) by extractive separation with N-p-methoxyphenyl-2-furylacrylohydroxamic acid and spectrophotometric determination with 4-(2-pyridylazo) resorcinol

Journal Article · Thu Sep 01 04:00:00 EDT 1988 · Anal. Lett.; (United States)

DOI:https://doi.org/10.1080/00032718808066523· OSTI ID:6870643

Abbasi, S A

Thorium (IV) was separated from several anions and cations commonly associated with it in environmental samples by liquid-liquid extraction with N-p-methoxyphenyl 1-2-furyl-acrylohydroxamic acid (MFHA) into chloroform at pH 3.6 - 5.5. The metal was then back-extracted into aqueous media containing 1.8 - 2.2 M HCl and determined spectrophotometrically at 500 nm (epsilon = 3.9 x 10/sup 4/ 1 mol/sup -1/ cm/sup -1/) with 4-(2-pyridylazo) resorcinol (PAR). The method was successfully applied to the analysis of thorium in coal fly ash, monazite, uranium-thorium ore, animal tissue, plant tissue, and natural waters. MFHA and PAR were chosen from thirteen hydroxamic acids and nine pyridylazo reagents, as the reagent combination that provided the maximum selectivity and sensitivity.

• Research Organization: Pondicherry (Central) Univ. (India)
• OSTI ID: 6870643
• Journal Information: Anal. Lett.; (United States), Journal Name: Anal. Lett.; (United States) Vol. 21:9; ISSN ANALB
• Country of Publication: United States
• Language: English

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ACTINIDES
AEROSOL WASTES
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ANIMAL TISSUES
ASHES
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RESIDUES
SEPARATION PROCESSES
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SPECTROPHOTOMETRY
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THORIUM COMPOUNDS
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THORIUM PHOSPHATES
TISSUES
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