The Experts below are selected from a list of 102930 Experts worldwide ranked by ideXlab platform
Jixin Qiao - One of the best experts on this subject based on the ideXlab platform.
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method for 236u determination in seawater using flow injection Extraction Chromatography and accelerator mass spectrometry
Analytical Chemistry, 2015Co-Authors: Jixin Qiao, Xiaolin Hou, Peter Steier, Sven Poul Nielsen, Robin GolserAbstract:An automated analytical method implemented in a flow injection (FI) system was developed for rapid determination of 236U in 10 L seawater samples. 238U was used as a chemical yield tracer for the whole procedure, in which Extraction Chromatography (UTEVA) was exploited to purify uranium, after an effective iron hydroxide coprecipitation. Accelerator mass spectrometry (AMS) was applied for quantifying the 236U/238U ratio, and inductively coupled plasma mass spectrometry (ICPMS) was used to determine the absolute concentration of 238U; thus, the concentration of 236U can be calculated. The key experimental parameters affecting the analytical effectiveness were investigated and optimized in order to achieve high chemical yields and simple and rapid analysis as well as low procedure background. Besides, the operational conditions for the target preparation prior to the AMS measurement were optimized, on the basis of studying the coprecipitation behavior of uranium with iron hydroxide. The analytical results i...
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determination of plutonium isotopes in waters and environmental solids a review
Analytica Chimica Acta, 2009Co-Authors: Jixin Qiao, Manuel Miró, Per RoosAbstract:A number of analytical methods have been developed in the past few years for environmental monitoring of plutonium (Pu) isotopes around nuclear facilities within protocols for emergency preparedness as well as for risk assessment of contaminated areas resulting from nuclear weapon tests, nuclear accidents, and the discharge of nuclear waste. This article summarizes and critically compares recently reported methods for determination of Pu isotopes in waters and environmental solid substrates, in which sample pre-treatment is imperative for separation of the target species from matrix ingredients and/or potentially interfering nuclides prior to detection by radiometric or mass spectrometric techniques. Also discussed, via representative examples, is the automation of the entire analytical protocol by on-line Extraction Chromatography and ion exchange Chromatography using flow injection (FI) or sequential injection (SI) approaches.
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rapid determination of plutonium isotopes in environmental samples using sequential injection Extraction Chromatography and detection by inductively coupled plasma mass spectrometry
Analytical Chemistry, 2009Co-Authors: Jixin Qiao, Per Roos, Xiaolin Hou, Manuel MiróAbstract:This article presents an automated method for the rapid determination of 239Pu and 240Pu in various environmental samples. The analytical method involves the in-line separation of Pu isotopes using Extraction Chromatography (TEVA) implemented in a sequential injection (SI) network followed by detection of isolated analytes with inductively coupled plasma mass spectrometry (ICP-MS). The method has been devised for the determination of Pu isotopes at environmentally relevant concentrations, whereby it has been successfully applied to the analyses of large volumes/amounts of samples, for example, 100−200 g of soil and sediment, 20 g of seaweed, and 200 L of seawater following analyte preconcentration. The investigation of the separation capability of the assembled SI system revealed that up to 200 g of soil or sediment can be treated using a column containing about 0.70 g of TEVA resin. The analytical results of Pu isotopes in the reference materials showed good agreement with the certified or reference valu...
Manuel Miró - One of the best experts on this subject based on the ideXlab platform.
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determination of plutonium isotopes in waters and environmental solids a review
Analytica Chimica Acta, 2009Co-Authors: Jixin Qiao, Manuel Miró, Per RoosAbstract:A number of analytical methods have been developed in the past few years for environmental monitoring of plutonium (Pu) isotopes around nuclear facilities within protocols for emergency preparedness as well as for risk assessment of contaminated areas resulting from nuclear weapon tests, nuclear accidents, and the discharge of nuclear waste. This article summarizes and critically compares recently reported methods for determination of Pu isotopes in waters and environmental solid substrates, in which sample pre-treatment is imperative for separation of the target species from matrix ingredients and/or potentially interfering nuclides prior to detection by radiometric or mass spectrometric techniques. Also discussed, via representative examples, is the automation of the entire analytical protocol by on-line Extraction Chromatography and ion exchange Chromatography using flow injection (FI) or sequential injection (SI) approaches.
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rapid determination of plutonium isotopes in environmental samples using sequential injection Extraction Chromatography and detection by inductively coupled plasma mass spectrometry
Analytical Chemistry, 2009Co-Authors: Jixin Qiao, Per Roos, Xiaolin Hou, Manuel MiróAbstract:This article presents an automated method for the rapid determination of 239Pu and 240Pu in various environmental samples. The analytical method involves the in-line separation of Pu isotopes using Extraction Chromatography (TEVA) implemented in a sequential injection (SI) network followed by detection of isolated analytes with inductively coupled plasma mass spectrometry (ICP-MS). The method has been devised for the determination of Pu isotopes at environmentally relevant concentrations, whereby it has been successfully applied to the analyses of large volumes/amounts of samples, for example, 100−200 g of soil and sediment, 20 g of seaweed, and 200 L of seawater following analyte preconcentration. The investigation of the separation capability of the assembled SI system revealed that up to 200 g of soil or sediment can be treated using a column containing about 0.70 g of TEVA resin. The analytical results of Pu isotopes in the reference materials showed good agreement with the certified or reference valu...
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recent developments in flow injection sequential injection liquid liquid Extraction for atomic spectrometric determination of metals and metalloids
Applied Spectroscopy Reviews, 2009Co-Authors: Aristidis N Anthemidis, Manuel MiróAbstract:Abstract This review aims to provide a critical overview of automated flow injection and sequential injection liquid-liquid Extraction for preconcentration and/or separation of ultra-trace metal and metalloid species hyphenated with atomic spectrometric detection systems, including some new trends and applications in the subbranches of cloud point Extraction (CPE), wetting film Extraction (WFE), supported liquid membrane Extraction (SLME), Extraction Chromatography (EChr), and liquid-phase microExtraction (LPME) techniques. The analytical performance of flow-injection/sequential injection liquid-liquid Extraction methods is markedly affected by the components of the flow network such as segmentor, Extraction coil, and phase separator. Thus, an overall presentation of system components along with some novel strategies for interface with atomic spectrometers is discussed and exemplified with selected applications.
Xiaolin Hou - One of the best experts on this subject based on the ideXlab platform.
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method for 236u determination in seawater using flow injection Extraction Chromatography and accelerator mass spectrometry
Analytical Chemistry, 2015Co-Authors: Jixin Qiao, Xiaolin Hou, Peter Steier, Sven Poul Nielsen, Robin GolserAbstract:An automated analytical method implemented in a flow injection (FI) system was developed for rapid determination of 236U in 10 L seawater samples. 238U was used as a chemical yield tracer for the whole procedure, in which Extraction Chromatography (UTEVA) was exploited to purify uranium, after an effective iron hydroxide coprecipitation. Accelerator mass spectrometry (AMS) was applied for quantifying the 236U/238U ratio, and inductively coupled plasma mass spectrometry (ICPMS) was used to determine the absolute concentration of 238U; thus, the concentration of 236U can be calculated. The key experimental parameters affecting the analytical effectiveness were investigated and optimized in order to achieve high chemical yields and simple and rapid analysis as well as low procedure background. Besides, the operational conditions for the target preparation prior to the AMS measurement were optimized, on the basis of studying the coprecipitation behavior of uranium with iron hydroxide. The analytical results i...
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rapid determination of plutonium isotopes in environmental samples using sequential injection Extraction Chromatography and detection by inductively coupled plasma mass spectrometry
Analytical Chemistry, 2009Co-Authors: Jixin Qiao, Per Roos, Xiaolin Hou, Manuel MiróAbstract:This article presents an automated method for the rapid determination of 239Pu and 240Pu in various environmental samples. The analytical method involves the in-line separation of Pu isotopes using Extraction Chromatography (TEVA) implemented in a sequential injection (SI) network followed by detection of isolated analytes with inductively coupled plasma mass spectrometry (ICP-MS). The method has been devised for the determination of Pu isotopes at environmentally relevant concentrations, whereby it has been successfully applied to the analyses of large volumes/amounts of samples, for example, 100−200 g of soil and sediment, 20 g of seaweed, and 200 L of seawater following analyte preconcentration. The investigation of the separation capability of the assembled SI system revealed that up to 200 g of soil or sediment can be treated using a column containing about 0.70 g of TEVA resin. The analytical results of Pu isotopes in the reference materials showed good agreement with the certified or reference valu...
Kwang Soon Choi - One of the best experts on this subject based on the ideXlab platform.
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determination of ru rh pd te mo and zr in spent pressurized water reactor fuels by ion exchange and Extraction chromatographic separations and inductively coupled plasma atomic emission spectrometric analysis
Analytica Chimica Acta, 2003Co-Authors: Kwang Soon Choi, Yeong Jae ParkAbstract:A study has been carried out on the quantitative analysis of Ru, Rh, Pd, Te, Mo and Zr, which are main components of undissolved materials dispersed in nitric acid dissolver solutions of spent pressurized water reactor (PWR) fuels, using inductively coupled plasma atomic emission spectrometry (ICP-AES). The dissolution of the insoluble residues filtrated from the dissolver solutions by acid digestion bomb technique and the separation of Ru, Rh, Pd, Te, Mo and Zr from U and transuranous elements in the filtrate by ion exchange, and di(2-ethylhexyl) phosphoric acid (HDEHP) Extraction Chromatography were discussed in detail. The applicability and versatility of the proposed separation procedure combined with ICP-AES analysis were evaluated by chemically characterizing the spent PWR fuels with burnups from 36,000 to 39,000 MWd/MtU.
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separation of fission products from spent pressurized water reactor fuels by anion exchange and Extraction Chromatography for inductively coupled plasma atomic emission spectrometric analysis
Analytica Chimica Acta, 2001Co-Authors: Kwang Soon Choi, Byong Chul SongAbstract:A study has been carried out on the separation of fission products from spent pressurized water reactor (PWR) fuels and their quantitative determination using inductively coupled plasma atomic emission spectrometry (ICP-AES). Plutonium and uranium were separated from fission products using anion exchange and tri-n-butylphosphate (TBP) Extraction Chromatography, respectively. Americium was separated and fission products such as Sr, Ba, Cd, La, Ce, Pr, Nd, Sm, Eu, Gd and Y were quantitatively recovered using di(2-ethylhexyl)phosphoric acid (HDEHP) Extraction Chromatography. An ICP-AES/shielding system, which was specially designed and built for the analysis of radioactive materials, was employed and the analytical precision for all metal elements studied was found to be <5%. Three spent PWR fuels whose burnup rates were between 15,000 and 35,000 MWd/MTU were analysed and then the relation between the burnup and the quantity of the fission products was compared to that calculated by burnup code, ORIGEN 2.
Cynthia A Mahan - One of the best experts on this subject based on the ideXlab platform.
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separation of actinides at ultra trace level from urine matrix using Extraction Chromatography inductively coupled plasma mass spectrometry
Journal of Analytical Atomic Spectrometry, 2004Co-Authors: Wei Hang, Luwang Zhu, Wenwan Zhong, Cynthia A MahanAbstract:The determination of trace level actinides in a urine matrix was evaluated on the chromatographic column packed with TRU resin for separation. The chromatographic system was coupled on-line to the inductively coupled plasma mass spectrometer (ICP-MS) for pre-concentration and separation of uranium, thorium, plutonium, neptunium, and americium. 3 M nitric acid was employed to remove the matrix ions, which at the same time pre-concentrated the actinides to obtain detection limits in the range of 0.01–2 pg mL−1. Different concentrations of HCl and oxalic acid were used to sequentially elute the five actinides. The separation took ca. 25 minutes, with no sample preparation required. Linear dynamic range, precision of the measurement, and lifetime of the column were studied to evaluate the proposed method. The method of on-line separation and pre-concentration of actinides in urine offers major improvements to routine procedures for bioassay analysis.
