Nanometer-sized titanium dioxide micro-column on-line preconcentration of La, Y, Yb, Eu, Dy and their determination by inductively coupled plasma atomic emission spectrometry

Liang, Pei; Hu, Bin; Jiang, Zucheng; Qi, Yuan; Peng, Tianyou

doi:10.1039/b104050m

Cited by 108 publications

(41 citation statements)

References 23 publications

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“…Recently, magnetic separation technique (MST) has a wide range of applications including shape-selective [18], catalysis chromatographic separations [19], sorption of metal ions [20], enzyme encapsulation [21], DNA transfection [22], and drug delivery [23]. MST is based on the magnetic material, which is attracted to a magnetic field but retains no residual magnetism after the field is removed.…”

Section: Introductionmentioning

confidence: 99%

Speciation of inorganic tellurium from seawater by ICP‐MS following magnetic SPE separation and preconcentration

Huang

Hu²

2008

J of Separation Science

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103

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A new method was developed for the speciation of inorganic tellurium species in seawater by inductively coupled plasma-MS (ICP-MS) following selective magnetic SPE (MSPE) separation. Within the pH range of 2 -9, tellurite (Te(IV)) could be quantitatively adsorbed on c-mercaptopropyltrimethoxysilane (c-MPTMS) modified silicacoated magnetic nanoparticles (MNPs), while the tellurate (Te(VI)) was not retained and remained in solution. Without filtration or centrifugation, these telluriteloaded MNPs could be separated easily from the aqueous solution by simply applying external magnetic field. The Te(IV) adsorbed on the MNPs could be recovered quantitatively using a solution containing 2 mol/L HCl and 0.03 mol/L K 2 Cr 2 O 7 . Te(VI) was reduced to Te(IV) by L-cysteine prior to the determination of total tellurium, and its assay was based on subtracting Te(IV) from total tellurium. The parameters affecting the separation were investigated systematically and the optimal separation conditions were established. Under the optimal conditions, the LOD obtained for Te(IV) was 0.079 ng/L, while the precision was 7.0% (C = 10 ng/L, n = 7). The proposed method was successfully applied to the speciation of inorganic tellurium in seawater.

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Section: Introductionmentioning

confidence: 99%

Speciation of inorganic tellurium from seawater by ICP‐MS following magnetic SPE separation and preconcentration

Huang

Hu²

2008

J of Separation Science

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103

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“…[2][3][4] Inductively coupled plasma atomic emission spectrometry (ICP-AES) is the most used technique in the determination of trace REEs because of the capability for rapid multi-element detection over a wide concentration range with relatively low detection limits. [5][6][7] Compared to other techniques such as neutron activate analysis (NAA) 8 or inductively coupled plasma mass spectrometry (ICP-MS), 9,10 ICP-AES is relatively inexpensive. However, the low level of REEs in samples is not compatible with detection limits exhibited by this technique, and major constituents, such as organic compounds and inorganic salts, may cause some matrix effects.…”

Section: Introductionmentioning

confidence: 99%

ICP-AES Determination of Trace Rare Earth Elements in Environmental and Food Samples by On-line Separation and Preconcentration with Acetylacetone-modified Silica Gel Using Microcolumn

Zhang

Huang

2007

ANAL. SCI.

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A novel method of online microcolumn separation and preconcentration coupled to inductively coupled plasma atomic emission spectrometry (ICP-AES) with the use of acetylacetone-modified silica gel as packing material was developed for the determination of trace rare earth elements (REEs) in environmental and food samples. The main parameters affecting online separation/preconcentration, including pH, sample flow rate, sample volume, elution and interfering ions, have been investigated in detail. Under the optimized operating conditions, the adsorption capacity values for Sc, Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu were 25.65, 23.23, 24.01, 19.40, 22.89, 23.77, 24.40, 23.96, 25.58, 25.15, 24.86, 22.75, 16.05, 24.13, 26.51 and 27.93 mg g -1 , respectively. Detection limits (3σ) based on three times standard deviations of the blanks by 8 replicates were in the range from 48 pg mL -1 for Lu to 1003 pg mL -1 for Sm. With 90 s preconcentration time and 10 s elution time, the enrichment factor was 10 and the sample frequency was 28 h -1 . The precisions (RSDs) obtained by determination of a 250 ng mL -1 (n = 8) REEs standard solution were in the range from 1.7% for Y to 4.4% for Sm. The proposed method was successfully applied to the determination of trace REEs in pig liver, agaric and mushroom. To validate the proposed method, we analyzed three certified reference materials (GBW07401 soil, GBW07301a sediment, and GBW07605 tea leaves). The determined values were in a good agreement with the certified values. The method is rapid, selective, sensitive and applicable to the determination of trace REEs in biological and environmental samples with complicated matrix effects.

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“…The simplicity, ease of availability and compatibility of SPE methods with different measurement techniques make them proper alternatives for expensive and time-consuming separation/preconcentration procedures. For example, Liang et al [6] used a microcolumn of TiO 2 for the on-line preconcentration of La, Y, Yb, Eu, Dy. Rucandio [7] applied Dowex 50W X18, a strong cation-exchange resin, to separate REEs from Ba.…”

Section: Introductionmentioning

confidence: 99%

“…Also, major constituents in several samples, such as organic compounds and inorganic salts, may result in interference effects. Various methods have been used for matrix removal/preconcentration purposes, such as coprecipitation [4], liquid-liquid extraction [17,18], ion-exchange [7][8][9]13], and a variety of sorbents including chelating resins [5,6,[10][11][12]15,19,20].…”

Section: Introductionmentioning

confidence: 99%

“…There have been many analytical techniques used for the determination of REEs in solid and solution samples; neutron activation analysis [1,2], isotope dilution mass spectrometry [3,4], inductively coupled plasma atomic emission spectrom-etry (ICP-AES) [5][6][7][8][9], and inductively coupled plasma mass spectrometry (ICP-MS) [10][11][12][13][14][15][16] are the most popular ones. These techniques are usually applied after a separation and/or a preconcentration step due to low concentrations of REEs in environmental samples.…”

Section: Introductionmentioning

confidence: 99%

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Preconcentration and atomic spectrometric determination of rare earth elements (REEs) in natural water samples by inductively coupled plasma atomic emission spectrometry

Pasinli

Eroğlu

Shahwan

2005

Analytica Chimica Acta

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The usage of a variety of sorbents has been shown as promising matrix removal/preconcentration strategies for the determination of rare earth elements (REEs) in various natural water samples by inductively coupled plasma atomic emission spectrometry (ICP-AES). The sorption efficiency of various zeolites (clinoptilolite, mordenite, zeolite Y, zeolite Beta), ion-exchangers (Amberlite CG-120, Amberlite IR-120, Rexyn 101, Dowex 50W X18) and chelating resins (Muromac, Chelex 100, Amberlite IRC-718) towards REEs was investigated in terms of solution pH, shaking time and sorbent amount. The results have shown that most of the materials can take up REEs at a wide pH range. The experiments were continued with clinoptilolite, zeolite Y and Chelex 100 and it was demonstrated that all three materials displayed very fast kinetics for REE sorption (higher than 96% in 1 min). Desorption from the sorbents was realized with 2.0 M HNO 3 for clinoptilolite and 0.1 M HNO 3 for zeolite Y and Chelex 100. Only the lower concentration range (0.01-2.0 mg l −1 ) of matrix-matched standards were used in quantitation although the calibration graphs were linear at least up to 10.0 mg l −1 for all REEs studied. The limit of detection (3 s) without preconcentration was 0.1, 1.0, and 0.2 g l −1 for Eu, La, and Yb, respectively. The validity of the method with the selected sorbents was checked through spike recovery experiments.

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Nanometer-sized titanium dioxide micro-column on-line preconcentration of La, Y, Yb, Eu, Dy and their determination by inductively coupled plasma atomic emission spectrometry

Cited by 108 publications

References 23 publications

Speciation of inorganic tellurium from seawater by ICP‐MS following magnetic SPE separation and preconcentration

Speciation of inorganic tellurium from seawater by ICP‐MS following magnetic SPE separation and preconcentration

ICP-AES Determination of Trace Rare Earth Elements in Environmental and Food Samples by On-line Separation and Preconcentration with Acetylacetone-modified Silica Gel Using Microcolumn

Preconcentration and atomic spectrometric determination of rare earth elements (REEs) in natural water samples by inductively coupled plasma atomic emission spectrometry

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