spectrometry Articles | Environmental XPRT

Isotope correlations for determining the isotopic composition of plutonium produced in research and power reactors using the experimental data obtained by alpha and mass spectrometry

Correlations have been developed for obtaining the isotopic composition of Pu produced in Indian research (CIRUS, DHRUVA) and power (PHWR) reactors. The experimental data obtained on 238Pu/(239Pu + 240Pu) alpha activity ratio using alpha spectrometry and on 240Pu/239Pu, 241Pu/239Pu, 242Pu/239Pu atom ratios by thermal ionisation mass spectrometry were used for developing isotope ...

May 31, 2005

By Inderscience Publishers

Mass Spectrometry in Real Time

Mass spectrometry as a technique has grown significantly in recent decades, with many analytical requirements are addressed by mass spectrometry in some form or other. The techniques of ionisation, mass separation and detection are varied, and the process is now used in analytical sectors ranging from relatively simple vacuum and vacuum process monitoring to the more complex life sciences and ...

Jul. 16, 2020

By Hiden Analytical Ltd.

SIMS depth profile analysis of WC-Co composite used in wood materials machining after nitrogen ion implantation

Abstract: SIMS depth profile analysis of WC-Co composites used in wood materials machining after nitrogen ion implantation. The paper presents the analysis of depth profiles WC-Co samples obtained using the SIMS method. The surface of samples was modified in the process of nitrogen ions implantation. Secondary ion mass spectrometry (SIMS) is a very useful technique for the analysis of layered ...

Dec. 8, 2020

By Hiden Analytical Ltd.

Mass spectrometric studies on irradiated (U, Pu) mixed carbide fuel of FBTR

Mass spectrometry was employed to characterise the irradiated mixed carbide fuel of fast breeder test reactor (FBTR) for assessing its performance: thermal ionisation mass spectrometry to determine the isotopic composition, concentrations of U, Pu and Nd in the dissolver solutions and to deduce the burn-up, and a quadrupole mass spectrometric system to obtain the percentage release of fission ...

May 31, 2005

By Inderscience Publishers

Slurry sampling electrothermal atomic absorption spectrometric determination of palladium in water using biosorption with inactive baker's yeast Saccharomyces cerevisiae

Inactive cells of yeast Saccharomyces cerevisiae were used for palladium preconcentration. The conditions for biosorption of palladium and its determination in yeast cells by slurry electrothermal atomic absorption spectrometry (ETAAS) were optimised. The best sensitivity of measurements and stability of slurry were obtained by using a mechanical agitation (10 minutes) and a mixture of 0.3 mol ...

Oct. 17, 2008

By Inderscience Publishers

Determination of Cadmium in the Tap Water by Flameless Atomic Absorption Spectrometry

The standard for the allowable concentration of cadmium in tap water has been revised downward from 0.01 mg/L or less to 0.003 mg/L or less according to Japan's "Ministerial Ordinance for Partial Revision of the Ordinance Concerning the Water Quality Standard" (The Ministry of Health, Labour and Welfare Ordinance No.18) (February 17, 2010). The revised standard has been in effect since April 1, ...

Nov. 17, 2011

By Shimadzu Scientific Instruments Inc

Application of chemometry for identification of the source of plutonium

Isotope correlations and chemometry using Principal Component Analysis (PCA) have been used on the experimental data on Pu from different kinds of reactors, e.g. research, power reactors with low and high burn-up as well as for fuels with different 235U content. It is demonstrated that the combined use of isotope correlations and PCA is a powerful tool to discriminate Pu originating from ...

Mar. 29, 2011

By Inderscience Publishers

210Pb geochronology of sediments from the Guama River and Guajara Bay in the Amazon region, Belem, Brazil

This study chronologically dated three sediment profiles collected at the mouth of the Amazon River using the 210Pb geochronology method. All profiles were sliced into 5 cm layers and analysed for radionuclides through gamma spectrometry. The results obtained dated the sediments as far back as 65 years. The sedimentation rate was also determined. A subsequent interpretation of the results ...

Jan. 19, 2010

By Inderscience Publishers

Novel mixed-mode stationary phases for chromatographic separation of complex mixtures of decomposed lignin

Abstract Electrochemical degradation of lignin results in a large number of unknown products, formed by both oxidative and reductive decomposition pathways, which have previously been studied by direct mass spectrometry experiments without prior liquid chromatography separation, revealing the presence of many isobaric molecules. In this study, novel phosphonium-based ionic liquid stationary ...

Jan. 13, 2017

By SusChem

Analysis of radioisotope concentrations in sediments using γ-ray spectrometry

The concentrations of some naturally occurring radioisotopes in sediments of the Kufranja river basin in Jordan were determined by means of γ-ray spectrometry with precise calibration of energy and efficiency. The nuclides' concentrations were found by either direct measurement of their activities, as in the case of 226Ra and 40K, or through the measurements of the activities of their daughters ...

Mar. 21, 2006

By Inderscience Publishers

Isolation and characterization of carnocyclin a, a novel circular bacteriocin produced by carnobacterium maltaromaticum UAL307

Carnobacterium maltaromaticum UAL307, isolated from fresh pork, exhibits potent activity against a number of gram-positive organisms, including numerous Listeria species. Three bacteriocins were isolated from culture supernatant, and using matrix-assisted laser desorption ionization-time of flight mass spectrometry and Edman sequencing, two of these bacteriocins were identified as piscicolin 126 ...

Aug. 1, 2008

By American Society for Microbiology (ASM)

Do You See What We See? Mass Spectrometry Imaging is Revealing Insights in Biomedical Research

The spatial distribution of molecular species in a sample can provide a wealth of information about biological, chemical and physiological processes. Mass spectrometry (MS) imaging is a rapidly developing research technique that enables specific measurement of molecular targets at complex surfaces. This direct-from-sample analytical technique provides researchers with the information needed to ...

Jun. 21, 2016

By Waters Corporation

Classification of proteomic data with multiclass Logistic Partial Least Squares algorithm

Early detection of cancer is crucial for successful treatments. In this paper, we propose a multiclass Logistic Partial Least Squares (LPLS) algorithm for classification of normal vs. cancer using Mass Spectrometry (MS). LPLS combines the multiclass logistic regression with Partial Least Squares (PLS) algorithm. Wavelet decomposition is also proposed for pre-processing of original data. Wavelet ...

Mar. 1, 2008

By Inderscience Publishers

The effect of photosensitizer on diclofenac photodegradation under simulated sunlight

This paper studies the effect of photosensitizer (acetone, H2O2, surfactant and pigment) on photodegradation of diclofenac (DCF) under simulated sunlight. The results demonstrate that degradation pathways proceed via pseudo first-order kinetics in all cases. The photodegradation rate was found to increase with increasing acetone and H2O2. Surfactant and pigment inhibited the photodegradation of ...

Nov. 20, 2012

By IWA Publishing

Proton-Transfer-Reaction Time-of-Flight Mass Spectrometry (PTR-TOFMS): Latest Improvements in Selectivity and Sensitivity

Proton-Transfer-Reaction Mass Spectrometry (PTR-MS) is one of the most sensitive methods for real-time gas analysis. One limitation, however, is the lack of unambiguous compound identification, since only the m/z of an ion is acquired. We recently tested several approaches of increasing the selectivity via varying the reduced electric field strength (E/N) and switching the reagent ions between ...

Dec. 8, 2014

By Ionicon Analytik Ges.m.b.H.

Quantitative relations between different concentrations of micro- and macroelements in mosses and lichens: the region of Opole (Poland) as an environmental interface in between Eastern and Western Europe

We examined the concentration of selected metals: Al, Mn, Fe, Cu, Zn, Cd and Pb, as well as activity of 137Cs in samples of moss and lichen, collected in the area surrounding Bory Stobrawskie, a wood complex situated in southern Poland. The concentration of metals was determined by atomic absorption spectrometry. The activity of 137Cs was determined by gamma spectrometry. We used these results, ...

Jun. 30, 2010

By Inderscience Publishers

Evaluating the insecticidal genes and their expressed products in bacillus thuringiensis strains by combining pcr with mass spectrometry

By a combination of PCR and mass spectrometry, a total of five cry genes (cry1Aa, cry1Ac, cry2Aa, cry2Ab, and cry1Ia) were detected in genomic DNA from the wild-type Bacillus thuringiensis strain 4.0718, and three protoxins (Cry1Aa, Cry1Ac, and Cry2Aa) were identified in the strain's parasporal crystals. These results indicated that this complementary method may be useful in evaluating B. ...

Sep. 3, 2008

By American Society for Microbiology (ASM)

Organotin compounds in sediments of three coastal environments from the Patagonian shore, Argentina

One of the most toxic compounds that have been introduced into the marine environment is Tributyltin (TBT) used as a biocide in antifouling paints. The aim of this study was to obtain the first information of TBT pollution in sediments of three environments of the Argentinean coastline. Sediments from the Bahia Blanca estuary, San Antonio Bay and Ushuaia Bay were sampled to determine TBT and ...

Jun. 28, 2011

By Inderscience Publishers

Featured Article on Laser Ablation Chemical Analysis – LIBS, LA-ICP-MS/OES, and LAMIS

Laser ablation is a powerful approach to chemical analysis because of its versatility. It has advantages in chemical analysis including direct characterization of solids, no chemical procedure of dissolution, which reduces the risk of contamination or sample loss, analysis of very small samples not separable from solution analysis, and determination of spatial distribution of elemental ...

Jun. 1, 2017

By Applied Spectra, Inc. (ASI)

Comparison of spectrometry with arsenazo III and neutronic activation for U and Th determination in phosphogypsum

Phosphogypsum is a byproduct from the phosphoric acid industry which is formed by crystallisation during sulfuric acid attack on phosphate rocks. While the composition of phosphogypsum is dihydrated calcium sulphate, the material can contain high levels of impurities that exist in phosphate rocks, such as radionuclides from the 238U and 232Th series. The most common way of disposing of ...

Dec. 15, 2009

By Inderscience Publishers

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