Determination of picogram quantities of uranium in biological tissues by isotope dilution thermal ionization mass spectrometry with ion counting detection

Fassett, J. D.; Kingston, H. M.

doi:10.1021/ac00258a015

Cited by 47 publications

(14 citation statements)

References 41 publications

(15 reference statements)

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“…Thermal ionization mass spectrometry (TIMS) [16] also provides accurate and precise measurements, but is not practical for large number of patient screenings since extensive sample preparations are required [2,[16][17][18]. Alpha and gamma particle spectrometries have also been used [19][20][21][22] but require long counting times, removal of uranium from the matrix and display detection limits 2-3 orders of magnitude worse than ICP-MS.…”

Section: Introductionmentioning

confidence: 99%

Determination of 236U/238U and 235U/238U isotope ratios in human urine by inductively coupled plasma mass spectrometry

Gray¹,

Zhang²,

Xu³

et al. 2012

Microchemical Journal

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Section: Introductionmentioning

confidence: 99%

Determination of 236U/238U and 235U/238U isotope ratios in human urine by inductively coupled plasma mass spectrometry

Gray¹,

Zhang²,

Xu³

et al. 2012

Microchemical Journal

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“…The constant bias of the analytical procedure can be evaluated by analyzing two different masses of samples and checking if both samples deliver the same result. It is estimated with the Youden method [ 29 , 30 ] according to ( 4 ):

where b cte denotes the constant bias (expressed in ng), a i and a j are the mean values of the two masses of the subsamples for comparison, and x i and x j are the mean masses of quantified chlorinated compounds (ng).…”

Section: Methodsmentioning

confidence: 99%

Validating Analytical Protocols to Determine Selected Pesticides and PCBs Using Routine Samples

Jiménez

Garcı́a-Alonso

Pérez-Pastor

2017

Journal of Analytical Methods in Chemistry

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This study aims at providing recommendations concerning the validation of analytical protocols by using routine samples. It is intended to provide a case-study on how to validate the analytical methods in different environmental matrices. In order to analyze the selected compounds (pesticides and polychlorinated biphenyls) in two different environmental matrices, the current work has performed and validated two analytical procedures by GC-MS. A description is given of the validation of the two protocols by the analysis of more than 30 samples of water and sediments collected along nine months. The present work also scopes the uncertainty associated with both analytical protocols. In detail, uncertainty of water sample was performed through a conventional approach. However, for the sediments matrices, the estimation of proportional/constant bias is also included due to its inhomogeneity. Results for the sediment matrix are reliable, showing a range 25–35% of analytical variability associated with intermediate conditions. The analytical methodology for the water matrix determines the selected compounds with acceptable recoveries and the combined uncertainty ranges between 20 and 30%. Analyzing routine samples is rarely applied to assess trueness of novel analytical methods and up to now this methodology was not focused on organochlorine compounds in environmental matrices.

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“…Extractable ammonium and nitrate nitrogen (NH 4 + and NO 3 − ) were measured simultaneously in 2 mol/L KCl solution (1∶5 w/v) [53] using a Lachat Flow Injection Analyzer (Lachat Instruments, Milwaukee, WI). The amount of extractable ammonium and nitrate nitrogen were taken as total inorganic N. SOC was measured by the potassium dichromate oxidation method with ground air-dried soils [54] while STN was measured by Kjeldahl method [55]. Because of the minor variation of SOC and STN in our study sites over a year (data not shown), we only measured the values in summer time (July) and did not take the difference between summer and winter into consideration.…”

Section: Methodsmentioning

confidence: 99%

Comparison of Seasonal Soil Microbial Process in Snow-Covered Temperate Ecosystems of Northern China

et al. 2014

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More than half of the earth's terrestrial surface currently experiences seasonal snow cover and soil frost. Winter compositional and functional investigations in soil microbial community are frequently conducted in alpine tundra and boreal forest ecosystems. However, little information on winter microbial biogeochemistry is known from seasonally snow-covered temperate ecosystems. As decomposer microbes may differ in their ability/strategy to efficiently use soil organic carbon (SOC) within different phases of the year, understanding seasonal microbial process will increase our knowledge of biogeochemical cycling from the aspect of decomposition rates and corresponding nutrient dynamics. In this study, we measured soil microbial biomass, community composition and potential SOC mineralization rates in winter and summer, from six temperate ecosystems in northern China. Our results showed a clear pattern of increased microbial biomass C to nitrogen (N) ratio in most winter soils. Concurrently, a shift in soil microbial community composition occurred with higher fungal to bacterial biomass ratio and gram negative (G-) to gram positive (G+) bacterial biomass ratio in winter than in summer. Furthermore, potential SOC mineralization rate was higher in winter than in summer. Our study demonstrated a distinct transition of microbial community structure and function from winter to summer in temperate snow-covered ecosystems. Microbial N immobilization in winter may not be the major contributor for plant growth in the following spring.

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Determination of picogram quantities of uranium in biological tissues by isotope dilution thermal ionization mass spectrometry with ion counting detection

Cited by 47 publications

References 41 publications

Determination of 236U/238U and 235U/238U isotope ratios in human urine by inductively coupled plasma mass spectrometry

Determination of 236U/238U and 235U/238U isotope ratios in human urine by inductively coupled plasma mass spectrometry

Validating Analytical Protocols to Determine Selected Pesticides and PCBs Using Routine Samples

Comparison of Seasonal Soil Microbial Process in Snow-Covered Temperate Ecosystems of Northern China

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