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516 Newest Publications about the topic isotopes

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Isotope effect on the spin dynamics of single-molecule magnets probed by muon spin spectroscopy

27-Jun-2018 | Lorenzo Tesi; Zaher Salman; Irene Cimatti; Fabrice Pointillart; Kevin Bernot; Matteo Mannini; Roberta Sessoli, Chemical Communication, 2018

Muon spin relaxation (μSR) experiments on a single molecule magnet enriched in different Dy isotopes detect unambiguously a slowing down of the zero field spin dynamics for the non-magnetic isotope. This occurs in the low temperature regime dominated by quantum tunnelling, in agreement with ...

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Sensors, Vol. 18, Pages 2016: European In-Situ Snow Measurements: Practices and Purposes

22-Jun-2018 | Pirazzini, Roberta ; Leppänen, Leena ; Picard, Ghislain ; Lopez-Moreno, Juan Ignacio ; Marty, Christoph ; Macelloni, ..., Sensors, 2018

Sensors, Vol. 18, Pages 2016: European In-Situ Snow Measurements: Practices and Purposes Sensors doi: 10.3390/s18072016 Authors: Roberta Pirazzini Leena Leppänen Ghislain Picard Juan Ignacio Lopez-Moreno Christoph Marty Giovanni Macelloni Anna Kontu Annakaisa von ...

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In This Issue [This Week in PNAS]

19-Jun-2018 | National Academy of Sciences, Proceedings of the National Academy of Sciences current issue, 2018

View of Tikopia Island with its crater lake from the peak of Mt Reani. Although little direct archaeological evidence exists to quantify the impacts of human colonization on local ecosystems, commensal animals, which accompany human habitation but are not domesticated, can preserve a record of ...

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Reference measurements of cadmium and lead contents in candidates for new environmental certified materials by isotope dilution inductively coupled plasma mass spectrometry

17-Jun-2018 | Author(s): Agnieszka Anna Krata, Marcin Wojciechowski, Mateusz Kalabun, Ewa Bulska, Microchemical Journal, 2018

Publication date: November 2018 Source:Microchemical Journal, Volume 142 Author(s): Agnieszka Anna Krata, Marcin Wojciechowski, Mateusz Kalabun, Ewa Bulska The analytical procedures for the reference measurements of cadmium and lead concentrations in four candidates for new ...

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A “peak cut” procedure of column separation for calcium isotope measurement using the double spike technique and thermal ionization mass spectrometry (TIMS)

29-May-2018 | Hongli Zhu; Fang Liu; Xin Li; Yajun An; Guiqin Wang; Zhaofeng Zhang, Journal of Analytical Atomic Spectrometry, 2018

Full recovery from column separation and matrix effects are the two factors that need to be considered for the high-precision analysis of stable Ca isotopes, but generally they are difficult to balance. In many cases, to get a pure Ca fraction, the interference of the matrix elements is reduced ...

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Low level determination of gallium isotopes by ICP-QQQ

26-May-2018 | Brian P. Jackson, Journal of Analytical Atomic Spectrometry, 2018

Determination of low concentrations of Ga in environmental or biological samples can benefit from interference free measurement of both Ga isotopes. Unfortunately, both isotopes have potential interferences, i.e. doubly charged Ba at m/z 69 and MnO at 71. Analysis using collision and reaction ...

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Hg isotopes reveal in-stream processing and legacy inputs in East Fork Poplar Creek, Oak Ridge, Tennessee, USA

25-May-2018 | Jason D. Demers; Joel D. Blum; Scott C. Brooks; Patrick M. Donovan; Ami L. Riscassi; Carrie L. Miller; Wang Zhe ..., Journal of Environmental Monitoring, 2018

Natural abundance stable Hg isotope measurements were used to place new constraints on sources, transport, and transformations of Hg along the flow path of East Fork Poplar Creek (EFPC), a point-source contaminated headwater stream in Oak Ridge, Tennessee. Particulate-bound Hg in the water column ...

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An improved method of Cr purification for high precision measurement of Cr isotopes by double spike MC-ICP-MS

24-May-2018 | Jian-Ming Zhu; Guangliang Wu; Xiangli Wang; Guilin Han; Lixin Zhang, Journal of Analytical Atomic Spectrometry, 2018

Chromium (Cr) isotopes have been used to trace pollution processes and reconstruct paleo-redox conditions. However, the precise determination of Cr isotopes is still challenged by difficulties in purifying Cr from samples with low Cr and high matrix content. Here, we developed an improved, ...

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The influence of the double spike proportion effect on stable isotope (Zn, Mo, Cd, and Sn) measurements by multicollector-inductively coupled plasma-mass spectrometry (MC-ICP-MS)

24-May-2018 | Le Zhang; Jie Li; Yi-Gang Xu; Zhong-Yuan Ren, Journal of Analytical Atomic Spectrometry, 2018

This study investigates the double spike (DS) proportion effect on measurements of stable Zn, Mo, Cd, and Sn isotopes by multicollector-inductively coupled plasma-mass spectrometry (MC-ICP-MS). The effect of DS proportion values between 0.1 and 0.9 (i.e., 10–90% DS) on the compositions of ...

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Evidence of transboundary mercury and other pollutants in the Puyango-Tumbes River basin, Ecuador–Peru

23-May-2018 | Bruce G. Marshall; Marcello M. Veiga; Robert J. Kaplan; Rebecca Adler Miserendino; Gary Schudel; Bridget A. Bergquis ..., Journal of Environmental Monitoring, 2018

In Portovelo in southern Ecuador, 87 gold processing centers along the Puyango-Tumbes River produce an estimated 6 tonnes of gold per annum using a combination of mercury amalgamation and/or cyanidation and processing poly-metallic ores. We analysed total Hg, Hg isotopes, total arsenic, cadmium, ...

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