An innovative spectrophotometric method for determination of uranium and thorium using 3-aminomethylalizarn- N - N diace
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An innovative spectrophotometric method for determination of uranium and thorium using 3‑aminomethylalizarn‑N‑N diacetic acid in some geological samples Ahmed Hussien Orabi1 · Nagwa Ibrahim Falila1 · Doaa Ahmed Ismaiel1 · Shaimaa Salah Abdulmoteleb1 Received: 29 July 2020 / Accepted: 4 November 2020 © Akadémiai Kiadó, Budapest, Hungary 2020
Abstract 3-aminomethylalizarn-N-N diacetic acid chromogenic dye (AMADA) was used for the first time in uranium and thorium spectrophotometric estimation with accurate and sensitive result, their complexes having a maximum absorbance at 575 nm for U and at 510 nm for Th. This system allows uranium and thorium content to be calculated with a detection limit (LOD) of 0.16 µg L−1 and 0.14 µg L−1, respectively. The first-derivative spectra and EDTA were investigated to eliminate interference and provide selective estimation of uranium and thorium in presence of each other. This new spectrophotometric method was applied for the determination of U(VI) and Th(IV) in the standard reference materials (granite and Syenite) and some cataclastic rock samples with accurate results. Keywords Spectrophotometric · Uranium · Thorium · 3-Aminomethylalizarn-N-N diacetic acid · Derivative spectrophotometric
Introduction Since World War II, numerous research teams have put a lot of work into creating an economic method to recover thorium, uranium, and rare earth elements (REEs) from their sources. Accuracy, speed and efficiency are the three main factors which contribute to the selection of analytical techniques. The techniques of optical emission (ICP-ES and ICP-MS) and X-ray fluorescence are highly sensitive for U and Th analyses, primarily at trace and low concentration levels [1–11]. The disadvantages of the above mentioned techniques are due to high costs, special installation and complicated maintenance for the purpose of regular daily monitoring of the process (in the quality control/quality assurance programmes). The popularity of spectrophotometry in determining U and Th arises, in addition to its economy, from the modest requirements of its apparatus, the short time needed for any analyst to get to know its use, an adequate level of sensitivity * Ahmed Hussien Orabi [email protected] 1
Nuclear Materials Authority, P.O. Box 530, El‑Maadi, Cairo, Egypt
for many present-day purposes and accuracy often as good as, if not better than, any other method within its range [12]. The following survey is restricted by reagents suitable for thorium analyses; These include; 2-(4-sulphophenylazo) chromotropic acid (SPADNS) [13], Arsenazo I and III [14–16], n-phenylbenzohydroxamic acid [17], Arsenazo B [18], Dibromo-o-nitro-arsenazo [19], bromo cresol orange (BCO) [20], pyrimidine azo dyes [21], Chromo Azural S [22, 23], 3,5-Dimethoxy-4-hydroxybenzaldehyde isonicotinoyl hydrazone [24], Diacetyl Monoxime Isonicotinoyl Hydrazone [25], Eriochrome Cyanine R [26], Xipamide [27], 2-hydroxy-1-naphthaldehydep-hydroxybenzoichydrazone [28], 5-bromo salicylaldehyde isonicotinoyl hydrazone [29], Thorin [3
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