Spectrophotometric determination of zirconium, uranium, thorium and rare earths with arsenazo III after extractions with thenoyltrifluoroacetone and tri-n-octylamine

Ōnishi, Hiroshi; Sekine, Keiichi

doi:10.1016/0039-9140(72)80108-5

Cited by 90 publications

(47 citation statements)

References 7 publications

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“…Various separation/pre-concentration techniques have been used for uranyl ion such as liquid extraction and solid phase extraction using cation exchangers, chemically modified or impregnated silica, active carbon, and Amberlite XAD resins. [25][26][27][28][29][30][31][32] Other technique for the preparation of solid phase sorbent is the imprinting technique that could be used for selective separation and pre-concentration of trace metal ions as uranium. [33][34] Synthetic polymers can modify the properties of functional groups attached to the backbone and improve the effectiveness of various molecular functions.…”

Section: Introductionmentioning

confidence: 99%

Binding of Uranyl Ions by Water-Insoluble Polymers Containing Multiligand Groups

Rivas¹,

Peric²,

Villegas³

et al. 2008

J. Chil. Chem. Soc.

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ReagentsAcrylic acid (AA, Merck), 4-Acryloylmorpholine (AMo, 97% Aldrich), 4-vinyl pyridine (VPy, 95% Aldrich), 1,4-divinylbenzene (DVB, Fluka), N-(3-dimethylamino)propylmethacrylamide (NDAPA, Aldrich), 3-dimeth ylamino)propylacrylate (DAPA, Aldrich) were purified by distillation. 2,2'-Azoisobutyronitrile (AIBN, Merck) was recrystallized from methanol, N,N'-methylene-bis-acrylamide (MBA, 99% Aldrich) and ammonium persulfate (AP, 95% Aldrich) were used without further purification.The analytical grade, copper(II) nitrate, uranyl acetate, nitric acid, perchloric acid, sodium hydroxide and sodium carbonate were purchased from Merck.Synthesis of the resins P(NDAPA), P(DAPA), P(AMo-AA), P(NDAPA-AA), P(NDAPA-VPy), and P(DAPA-AA)The resins P(NDAPA), P(DAPA), P(AMo-AA), P(NDAPA-AA), P(NDAPA-VPy), and P(DAPA-AA) were synthesized by radical polymerization by mixing the corresponding reagents in a polymerization flask as follows:P ( BINDING OF URANYL IONS BY WATER-INSOLUBLE POLYMERS ABSTRACTThe crosslinked resins poly(N-(3-dimethylamino)propylmethacrylamide) P(NDAPA), poly((3-dimethylamino)propylacrylate)P(DAPA), poly(4-acryloylmorpholine-co-acrylic acid) P(AMo-AA), poly(N-(3-dimethylamino)propylmethacrylamide-co-4-vinyl pyridine) P(NDAPA-VPy) and poly((3-dimethyl amino)propylacrylate-co-acrylic acid) P(DAPA-AA), poly(N-(3-dimethylamino)propylmethacrylamide-co-acrylic acid) P(NDAPA-AA) were obtained by radical polymerization. These resins were completely insoluble in water. The uptake metal ion properties were studied by batch equilibrium procedure for copper(II) and uranyl ions. The polymerization mixtures were kept under nitrogen at 70ºC for 8 h (see Scheme 1). Then methanol was added and the resin was removed from the flask, filtered and washed with abundant water. The resin was dried under vacuum at 40ºC and then milled and sized by screening. The fraction with mesh size in the range of 250-500 mm was chosen.

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Section: Introductionmentioning

confidence: 99%

Binding of Uranyl Ions by Water-Insoluble Polymers Containing Multiligand Groups

Rivas¹,

Peric²,

Villegas³

et al. 2008

J. Chil. Chem. Soc.

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“…Reaction samples contained the standard reaction buffer: 40 mM NaCl, 10 mM MgC12, 10 mM sodium acetate (for pH 4.5-6.5) or 10 mM Tris/HCI (for pH 6.5-8.5) and 100 pM europium chloride; tRNA was omitted. Following a 30-min incubation at 37°C and a 5-min centrifugation, aliquots were withdrawn and the concentration of europium ions was determined by complexometric method using Arsenazo-111 dye and A660 measurements [20].…”

Section: Effect O J T R N a Precipitation By The Europium Ionsmentioning

confidence: 99%

Probing the environment of lanthanide binding sites in yeast tRNA^Phe by specific metal‐ion‐promoted cleavages

Ciesiołka

Marciniec

Krzyżosiak

1989

European Journal of Biochemistry

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Specific yeast tRNAPhe hydrolysis brought about by europium ions has been studied in detail using the 32P-end-labeled tRNA and polyacrylamide gel electrophoresis. The dependence of the induced cleavages on pH, temperature and concentration of the europium ions has been determined. Europium hydrolyzes yeast tRNAPh' in the D-loop at phosphates 16 and 18, and the anticodon loop of phosphates 34 and 36. The two D-loop cuts are thought to take place from two distinct europium binding sites, while the two anticodon loop cleavages from a single site. Eight other members of the lanthanide series and ytrium give basically the same pattern of cleavages as europium. The specific cleavages taking place in the anticodon loop occur in an intramolecular mode from the lanthanide binding site that has not been found in yeast tRNAPhe crystal structure. It appears from the comparison of the europium-promoted cuts with those generated by magnesium and lead that the former two ions give more similar but not identical cleavage patterns. The usefulness of the specific cleavages induced by lanthanides for probing their own and magnesium binding sites in tRNA is discussed.Although the primary role of metal ions in their interactions with RNA molecules is to compensate negative charges of the polyanionic structures and to stabilize their biologically active conformations, some metal ions have been shown to be effective RNA-hydrolyzing agents. Highly specific yeast tRNAPh' hydrolysis has been described to be the property of magnesium [l], europium [2] and lead [3] ions. The hydrolytic activity had important implications for using europium as a fluorescent probe, and both europium and lead as heavy atoms to derivdtize tRNA crystals. Nevertheless, there was rather modest interest in these reactions until the RNA catalysis was discovered [4, 51. Soon after that, three strongly bound lead ions were precisely localized in yeast tRNAPhe crystal structure and the catalytic mechanism of the specific D-loop cleavage was proposed [6-91. The reaction was then subjected to a detailed characterization in solution, using both the native tRNA structure [lo] and in vitro transcripts of the wild-type and mutant yeast tRNAPhe genes [11]. It was also shown to proceed in trans with catalytic amounts of lead ion-bound 3'-half molecule acting with multiple turn-over on the 5'-half molecule of yeast tRNAPhe [ll]. The last finding has shown the yeast tRNAPhe-Pb system to be the first "ribozyme", the tertiary structure of which is known with an atomic resolution.Correspondence to W. J. Krzyzosiak, Institute of Bioorganic Chemistry, Polish Academy of Sciences, Noskowskiego 12, PL-61-704 Poznan, Poland This paper is dedicated to Professor Maciej Wiewiorowski on the occasion of his 70th birthday.Abbreviutions. D-loop, a loop of tRNA containing dihydrouridine; wybutine, a-(carboxyamino)-4,9-dihydro-4,6-dimethyI-9-0~0-1 H-imidazol[l,2-a]purine-7-butyric acid dimethyl ester, formerly referred to as Y-base or Y +-base; tRNAP_h;,, phenylalanine-specific tRNA with wyb...

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“…So far, various separation/preconcentration techniques have been used for uranyl ion such as liquid-liquid extraction [5][6][7] and solid-phase extraction, using cation exchangers, chemically modified [8] or impregnated silica, active carbon [9] and Amberlite XAD resins. During the last decade, some interest has been shown for preparation of uranyl-imprinted polymers.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of new ion-imprinted polymer for separation and preconcentration of uranyl (UO22+) ions

Ahmadi

Noori-kalkhoran

Shirvani-Arani

2010

Journal of Hazardous Materials

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Spectrophotometric determination of zirconium, uranium, thorium and rare earths with arsenazo III after extractions with thenoyltrifluoroacetone and tri-n-octylamine

Cited by 90 publications

References 7 publications

Binding of Uranyl Ions by Water-Insoluble Polymers Containing Multiligand Groups

Binding of Uranyl Ions by Water-Insoluble Polymers Containing Multiligand Groups

Probing the environment of lanthanide binding sites in yeast tRNA^Phe by specific metal‐ion‐promoted cleavages

Synthesis and characterization of new ion-imprinted polymer for separation and preconcentration of uranyl (UO22+) ions

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Spectrophotometric determination of zirconium, uranium, thorium and rare earths with arsenazo III after extractions with thenoyltrifluoroacetone and tri-n-octylamine

Cited by 90 publications

References 7 publications

Binding of Uranyl Ions by Water-Insoluble Polymers Containing Multiligand Groups

Binding of Uranyl Ions by Water-Insoluble Polymers Containing Multiligand Groups

Probing the environment of lanthanide binding sites in yeast tRNAPhe by specific metal‐ion‐promoted cleavages

Synthesis and characterization of new ion-imprinted polymer for separation and preconcentration of uranyl (UO22+) ions

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Probing the environment of lanthanide binding sites in yeast tRNA^Phe by specific metal‐ion‐promoted cleavages