Trace Element Mapping of Minerals and Materials by Electron Microprobe

1999 ◽  
Vol 5 (S2) ◽  
pp. 630-631
Author(s):  
J. Fournelle ◽  
C. Davidson ◽  
F. Spear ◽  
M. Kohn ◽  
H. Guo
Keyword(s):  
Trace Element ◽  
Electron Microprobe ◽  
Trace Element Level ◽  
Element Level ◽  
Faraday Cup ◽  
Minor Elements ◽  
High Detection ◽  
Trace And Minor Elements ◽  
Very High ◽  
Element Mapping

A strength of the modern electron microprobe is its ability to provide 2D compositional information about materials. These images give the ability to observe features that might otherwise pass unseen. Elements at the trace element level are generally ignored due to the high detection limits imposed by mapping under “standard” EMP conditions.Trace element mapping requires beam regulation at high (e.g. 300 nA) to very high (e.g. 3 μA) faraday cup currents, reliable beam and stage control, and suitable samples and mounting media. The ability to operate at high accelerating voltage to maximize Pk2/Bkg is desirable (Robinson and Graham, 1992), although we have encountered column difficulties above 25-30 kV.We are mapping trace and minor elements including Y, Sc, P, Cr, Mn, Ca, in garnets. Fig. 1 shows Y, Sc and Cr maps (Spear and Kohn, 1996; Kohn, Spear and Valley, 1997), and Fig. 2 Y and Sc maps (Cameron, unpub. data), produced with a Cameca SX51.

Detection of Urine C2C and Trace Element Level in Patients with Knee Osteoarthritis

2014 ◽  
Vol 70 (1) ◽  
pp. 475-479 ◽  
Author(s):  
Gang He ◽  
Xuanhuang Chen ◽  
Guodong Zhang ◽  
Haibin Lin ◽  
Rongyi Li ◽  
...  
Keyword(s):  
Knee Osteoarthritis ◽  
Trace Element ◽  
Trace Element Level ◽  
Element Level

Metals contamination and trace element level in breast milk samples of mothers in Kenitra, Morocco

2021 ◽  
pp. 1-13
Author(s):  
Farida Ait lhaj ◽  
Hecham Elhamri ◽  
Zakaria Ait lhaj ◽  
Abdelkader Zarrouk ◽  
Abdellah El Abidi ◽  
...  
Keyword(s):  
Breast Milk ◽  
Trace Element ◽  
Trace Element Level ◽  
Element Level ◽  
Milk Samples

Trace element level in infant hair and diet, and in the local environment of the Moroccan city of Marrakech

2006 ◽  
Vol 370 (2-3) ◽  
pp. 337-342 ◽  
Author(s):  
Chadrame Souad ◽  
Zaida Farida ◽  
Lekouch Nadra ◽  
Bureau François ◽  
Dominique Bougle ◽  
...  
Keyword(s):  
Trace Element ◽  
Local Environment ◽  
Trace Element Level ◽  
Element Level

Determination of Trace Element Level in Different Tissues of the Leaping Mullet (Liza saliens, Mugilidae) Collected from Caspian Sea

2011 ◽  
Vol 144 (1-3) ◽  
pp. 804-811 ◽  
Author(s):  
Mohammad Ali Ebrahimzadeh ◽  
Shahram Eslami ◽  
Seyed Fazel Nabavi ◽  
Seyed Mohammad Nabavi
Keyword(s):  
Trace Element ◽  
Caspian Sea ◽  
Trace Element Level ◽  
Element Level ◽  
Liza Saliens ◽  
Different Tissues

scholarly journals Vitamin, Trace Element, and Fatty Acid Levels ofVitex agnus-castusL.,Juniperus oxycedrusL., andPapaver somniferumL. Plant Seeds

2013 ◽  
Vol 2013 ◽  
pp. 1-4 ◽  
Author(s):  
Ahmet Ozkaya ◽  
Harun Ciftci ◽  
Okkes Yilmaz ◽  
Ahmet Zafer Tel ◽  
Erol Cil ◽  
...  
Keyword(s):  
Fatty Acid ◽  
Trace Element ◽  
Human Life ◽  
Papaver Somniferum ◽  
Icp Oes ◽  
Trace Element Level ◽  
Element Level ◽  
Juniperus Oxycedrus ◽  
Plant Seeds ◽  
Agnus Castus

The levels of fat-soluble vitamin, trace element and fatty acid ofVitex agnus-castusL.,Juniperus oxycedrusL., andPapaver somniferumL. seeds in Turkey were determined by using HPLC, ICP-OES, and GC, respectively. In theVitex agnus-castusL.,Juniperus oxycedrusL., andPapaver somniferumL. seeds, linoleic acid (18 : 2) was determined with the highest level rates (%54.11, %28.03, and %72.14, resp.). In theVitex agnus-castusL. seeds, R-tocopherol,α-tocopherol, and K1levels were determined as 9.70 μg/g, 18.20 μg/g, and 24.79 μg/g, respectively; In theJuniperus oxycedrusL. seeds, R-tocopherol,α-tocopherol, and K1were determined as 18.50 μg/g, 0.84 μg/g, and 5.00 μg/g, respectively, and in thePapaver somniferumL. seeds, R-tocopherol,α-tocopherol, K1, and D2levels were determined as 43.25 μg/g, 122.05 μg/g, 12.01 μg/g, and 0.62 μg/g, respectively. In theVitex agnus-castusL.,Juniperus oxycedrusL., andPapaver somniferumL. seeds, nickel (Ni), zinc (Zn), and iron (Fe) were determined with the trace element level rates (4.42 mg/kg, 10.43 mg/kg, 3.71 mg/kg for Ni, 7.00 mg/kg, 7.70 mg/kg, and 24 mg/kg for Zn and 93.73 mg/kg, 187.95 mg/kg, and 149.64 mg/kg for Fe, resp.). These parameters in seeds are very important for human life.

scholarly journals Partitioning of chromium between garnet and clinopyroxene: first-principle modelling versus metamorphic assemblages

2020 ◽  
Vol 32 (4) ◽  
pp. 387-403
Author(s):  
Sarah Figowy ◽  
Benoît Dubacq ◽  
Yves Noël ◽  
Philippe d'Arco
Keyword(s):  
Partition Coefficients ◽  
Large Scale ◽  
First Principle ◽  
Minor Elements ◽  
Geological Processes ◽  
Mineral Assemblages ◽  
Geochemical Behaviour ◽  
Kinetic Effects ◽  
Trace And Minor Elements ◽  
Element Mapping

Abstract. Understanding the geochemical behaviour of trace and minor elements in mineral assemblages is of primary importance to study small- and large-scale geological processes. Partition coefficients are frequently used to model the chemical evolution of minerals and fluids during melting and in metamorphic rocks of all grades. However, kinetic effects hampering equilibrium partitioning may invalidate the modelling. This study aims at calculating partition coefficients and testing their applicability in natural mineral assemblages, choosing Cr in garnet and clinopyroxene via exchange with Al as a case study. First-principle modelling has been combined with measurements and element mapping to estimate partition coefficients for Cr and the deviation from equilibrium. Results highlight the role of crystal chemistry over the strain field around point defects, controlling the dynamics of the Cr3+ = Al3+ exchange between clinopyroxene and garnet. Ab initio calculations allowed estimation of Cr partition coefficients between garnet and clinopyroxene, using a thermodynamic approach based on endmembers and mixing models simplified for trace element behaviour. The Cr3+ = Al3+ exchange reaction between garnet and the jadeite component of clinopyroxene depends on the grossular and pyrope content, with Cr preferentially incorporated into grossular over jadeite but preferentially incorporated into jadeite over pyrope. Comparison of predicted partition coefficients to measured concentrations in natural samples, together with element mapping, shows large disequilibrium. Cr-rich and Cr-poor sectors exhibit disequilibrium attributed to slow diffusivity of Cr during crystal growth and interface-coupled dissolution–precipitation, even for garnet–clinopyroxene assemblages crystallized around 850 ∘C.

Trace Element Level in Different Tissues of Rutilus frisii kutum Collected from Tajan River, Iran

2010 ◽  
Vol 143 (2) ◽  
pp. 965-973 ◽  
Author(s):  
Shahram Eslami ◽  
Akbar Hajizadeh Moghaddam ◽  
Naser Jafari ◽  
Seyed Fazel Nabavi ◽  
Seyed Mohammad Nabavi ◽  
...  
Keyword(s):  
Trace Element ◽  
Trace Element Level ◽  
Element Level ◽  
Tajan River ◽  
Rutilus Frisii Kutum ◽  
Different Tissues
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