Determination of trace amounts of lanthanides in rocks and minerals by high-performance liquid chromatography

Mazzucotelli, A.; Dadone, A.; Frache, Roberto; Baffi, F.

doi:10.1016/s0021-9673(00)90643-5

Cited by 30 publications

(9 citation statements)

References 10 publications

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“…2). Ranges for both variables were chosen to encompass the conditions of previous works cited from the literature [2][3][4][6][7][8][9][10][11][12][13][14]. Separation resolutions were calculated from peak RTs and widths reported directly from the Chormeleon software package provided by Dionex.…”

Section: Methodsmentioning

confidence: 99%

“…Using HPLC and a gradient elution approach with ␣-HIB, separation of the entire Ln series is possible within ∼30 min [4, [6][7][8][9][10][11][12][13][14]. These methods provide an average SR of 1.5 or better [4,[6][7][8][9][10][11][12][13][14] over the entire series, which is adequate for general analytical purposes.…”

Section: Implications For Rapid Lanthanide Analysismentioning

confidence: 99%

“…Both ion and reverse-phase chromatography methods were originally applied using gravity fed columns. Today, such methods are often performed under pressure or vacuum, allowing the use of smaller diameter columns and resins that in turn provide a greater number of theoretical plates and therefore enhance overall separation [6][7][8][9][10][11][12][13][14]. However, there are physical limitations of pressurized systems based upon the nature of the resin being used.…”

Section: Introductionmentioning

confidence: 99%

“…Several publications report the use of HPLC/cation exchange resin/␣-HIB eluent to effectively separate the lanthanide group of elements [4,[6][7][8][9][10][11][12][13][14]. In general terms, there will be a particular concentration and pH of the eluent that is best suited for separating a particular pair of neighboring peaks.…”

Section: Introductionmentioning

confidence: 99%

“…The published average SRs for HPLC methods utilizing ␣-HIB and a cation exchange column range from 1.5 to 2.4 [4,[6][7][8][9][10][11][12][13][14]. While a SR of 1.5 or greater theoretically represents less than 1% cross-contamination between two Gaussian peaks [15], this level of separation was not reached for each of the neighboring Lns in practice since these reported SRs represent average values from a set of numbers with significant variability and in many cases from chromatograms that exhibited significant peak tailing (i.e., not characterized as Gaussian peaks).…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Rapid, high-purity, lanthanide separations using HPLC

Schwantes

Rundberg

Taylor

et al. 2006

Journal of Alloys and Compounds

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Section: Methodsmentioning

confidence: 99%

Section: Implications For Rapid Lanthanide Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Rapid, high-purity, lanthanide separations using HPLC

Schwantes

Rundberg

Taylor

et al. 2006

Journal of Alloys and Compounds

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Detection of rare earth elements by post‐column reaction with xylenol orange and cetylpyridinium bromide

Hrdlička

Havel

Valiente

1992

J. High Resol. Chromatogr.

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SummaryRare earth elements have been separated by HPLC on octadecyl-bonded silica gel, dynamically modified with ammonium dodecylsulfate, using aqueous solutions of a-hydroxyisobutyric acid as mobile phase.The requirements and characteristics of post-column reaction with xylenol orange and cetylpyridinium bromide were investigated and optimized, and the reaction found to be highly sensitive and sufficiently rapid.The absorbance of the complex at 598 nm was not affected by the presence of a-hydroxyisobutyric acid at concentrations of the latter up to 150 mmol/l; at higher concentrations of the acid, the absorbance decreased slightly.For most of the rare earth elements the response was linear up to 0.2 mmol/l; the relative standard deviation of peak area was, typically, -1 %.The sensitivity of the method was usually better than 1 pg/ml.The results obtained from the determination of lanthanum, cerium, praseodymium, and neodymium in samples of apatite and bastnesite were in a good agreement with those obtained by ICP-AES. microbore cation-exchange column using an HIBA pH gradient, and monitored at 630 nm. The reaction conditions were not, however, studied and relatively high concentrations of XO (5 mmol/l) and CPB (10 mmol/l) in 20 % v/v methanol and concentrated ammonia buffer (pH 8.7) were used and values of molar absorptivities estimated from a chromatogram are rather low.Recently, a highly sensitive spectrophotometric method was proposed [8] Under optimum conditions (0.06 mmolil XO, 0 6 mmol/l CPB. and 0.01 moll1 acetate buffer, pH 4.5) the highest sensitivities were obtained at 610 nm; a t 600 nm the values of conditional molar absorptivities were between 80000 and 93000 mmol-'cm2 (detection limits 0.01-0.05 kg/ml) for all lanthanides.In this work, post-column derivatization of REE by reaction with XO and CPB has been studied and optimized. A sensitive method has been developed for the detection of REE after separation with HIBA solution on a dynamic ion exchanger.

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