Reversed-phase separation of transition metals, lanthanides and actinides by elution with mandelic acid

Elchuk, S.; Burns, Kerry I.; Cassidy, R. M.; Lucy, Charles A.

doi:10.1016/0021-9673(91)80125-z

Cited by 53 publications

(22 citation statements)

References 9 publications

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“…The separation of U and Th on RP columns using a-hydroxy isobutryic acid or mandelic acid or glycolic acid without modifying the column with ion interaction reagent was also investigated [5,6]. Many of the HPLC methods mentioned offered good separation of U and Th only in the presence of low concentrations of other metals, as larger concentrations resulted in column capacity loss and very poor resolution [7].…”

Section: Introductionmentioning

confidence: 99%

Separation behavior of U(VI) and Th(IV) on a cation exchange column using 2,6‐pyridine dicarboxylic acid as a complexing agent and its application for the rapid separation and determination of U and Th by ion chromatography

Jeyakumar

Mishra

Das

et al. 2011

J of Separation Science

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The retention behavior of U and Th as their 2,6-pyridine dicarboxylic acid (PDCA) complexes on a cation exchange column was investigated under low pH conditions. Based on the observed retention characteristics, an ion chromatographic method for the rapid separation of uranium and thorium in isocratic elution mode using 0.08 mM PDCA and 0.24 M KNO(3) in 0.22 M HNO(3) as the eluent was developed. Both uranium and thorium were eluted as their PDCA complexes within 2 min, whereas the transition and lanthanide metal cations were eluted as an unresolved broad peak after thorium. Under the optimized conditions both U and Th have no interference either from alkali and alkaline earth elements up to a concentration ratio of 1:500 or from other elements up to 1:100. The detection limits (LOD) of U and Th were calculated as 0.04 and 0.06 ppm, respectively (S/N=3). The precision in the measurement of peak area of 0.5 ppm of both U and Th was better than 5% and a linear calibration in the concentration range of 0.25-25 ppm of U and Th was obtained. The method was successfully applied to determine U and Th in effluent water samples.

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Section: Introductionmentioning

confidence: 99%

Separation behavior of U(VI) and Th(IV) on a cation exchange column using 2,6‐pyridine dicarboxylic acid as a complexing agent and its application for the rapid separation and determination of U and Th by ion chromatography

Jeyakumar

Mishra

Das

et al. 2011

J of Separation Science

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“…Similar methods have been demonstrated by Barkley et al [9] to determine uranium and thorium in uranium ores, and by Haddad et al for thorium and uranium in mineral sands [10], nitrophosphate solution [11] and spiked sea-water [ 12]. Other complexing agents which have been studied include mandelic acid [13] and glycolic acid [14]. All these methods incorporated post-column spectrophotometric detection with either 4-(2-pyridylazo)resorcinol (PAR) [2] or Arsenazo III [3][4][5][6][7][8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 79%

Determination of uranium in environmental matrices by chelation ion chromatography using a high performance substrate dynamically modified with 2,6-pyridinedicarboxylic acid

et al. 2000

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SummaryChelation ion chromatography, involving a high efficiency neutral polystyrene-divinylbenzene resin dynamically coated with 2,6-pyridinedicarboxylic acid, has been developed as a novel technique for the quantitative determination of uranium in complex matrices. An isocratic separation method, using an eluent consisting of 1M KNO3, 0.5M HNO3 and 0. lmM 2,6-pyridinedicarboxylic acid, allowed the uranyl ion to elute away from matrix interferences in under ten minutes. Detection was achieved using an Arsenazo III post column reaction system. Good recoveries were obtained from spiked mineral water and sea water and the standard addition curves produced good linearity (r 2 > 0.997) with a detection limit, calculated as twice baseline noise, of 20 #g L -1. The procedure was applied to the determination of trace uranium in standard reference water and sediment samples. The results obtained compared well with the certified values for uranium.

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“…[4] Elchuk and Cassidy used a more efficient ion-pair reversed-phase high-performance liquid chromatography (HPLC) system for the separation of the light lanthanides and determination of La(III) and Nd(III) in uranium dioxide fuel. [5] As a rule, addition of a complexing agent such as those commonly used for the separation of lanthanides, i.e., α-hydroxyisobutyric acid, [6][7][8][9] mandelic, [10] diglycolic [11] or nitrilotriacetic acid , [12] should decrease the effective charge of separated ions and hypothetically simplify the possibility for isocratic separation. Nevertheless, a concentration gradient elution of at least one order of magnitude range has to be used for the complete elution of all lanthanides in a reasonable time.…”

Section: Accepted Manuscriptmentioning

confidence: 98%

Group Separation of Heavy Metals Followed by Subsequent and Individual Separation of Lanthanides by Chelation Chromatography

Borai

Ekhlom

Harjula

2014

Journal of Liquid Chromatography & Related Technologies

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A new method was developed for group separation of some heavy metals (HM) from rare earth elements (REEs) followed by online individual separation of REEs. Various chelating agents were used as mobile phases such as DTPA, PDCA, NTA, HIBA and oxalic acid. These chelating agents were selected with different number of carboxylic acid groups and various geometrical structures which control the elution capability and the separation efficiency. The results showed that selective group separation of HM from REEs could be achieved by different options including 0.0005 M PDCA at pH 1, 0.005 M DTPA at pH 2, 0.1 M AHIBA at pH 2 or 0.0007 M NTA at pH 2. The selective elution of HM is attributed to the stronger complex formation between the carboxylic acid groups of the chelating agent with divalent HM ions than with trivalent REE ions especially at relatively low pH values. NTA chelating agent was selected for further investigation to test the individual separation of REEs. Finally, the optimum chromatographic conditions showed that HREEs and IREEs could be efficiently separated by 0.001 M NTA at pH 3 while LREEs were separated by 0.005M AHIBA at pH 4 followed by 0.001M PDCA at pH 2.

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Reversed-phase separation of transition metals, lanthanides and actinides by elution with mandelic acid

Cited by 53 publications

References 9 publications

Separation behavior of U(VI) and Th(IV) on a cation exchange column using 2,6‐pyridine dicarboxylic acid as a complexing agent and its application for the rapid separation and determination of U and Th by ion chromatography

Separation behavior of U(VI) and Th(IV) on a cation exchange column using 2,6‐pyridine dicarboxylic acid as a complexing agent and its application for the rapid separation and determination of U and Th by ion chromatography

Determination of uranium in environmental matrices by chelation ion chromatography using a high performance substrate dynamically modified with 2,6-pyridinedicarboxylic acid

Group Separation of Heavy Metals Followed by Subsequent and Individual Separation of Lanthanides by Chelation Chromatography

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