High-Temperature, Microwave-Assisted UV Digestion: A Promising Sample Preparation Technique for Trace Element Analysis

2001 ◽  
Vol 73 (7) ◽  
pp. 1515-1520 ◽  
Author(s):  
Dieter Florian ◽  
Günter Knapp
Keyword(s):  
High Temperature ◽  
Sample Preparation ◽  
Trace Element ◽  
Trace Element Analysis ◽  
Preparation Technique ◽  
Element Analysis ◽  
Microwave Assisted ◽  
Sample Preparation Technique

Effect of washing procedures on trace-element content of hair.

1977 ◽  
Vol 23 (9) ◽  
pp. 1771-1772 ◽  
Author(s):  
G S Assarian ◽  
D Oberleas
Keyword(s):  
Trace Element ◽  
Trace Element Analysis ◽  
Trace Element Content ◽  
Magnesium Content ◽  
Preparation Technique ◽  
Element Analysis ◽  
Significant Difference ◽  
Trace Element Status ◽  
Mg Content ◽  
Source Of Information

Abstract A pooled sample of hair was divided and portions prepared for analysis by three washing procedures, to evaluate the effect of washing procedure on the subsequent trace-element (Zn, Cu, Mg) content. The methods selected were a detergent wash, a hexane-ethanol wash, and an acetone-ether-detergent wash. For all elements, there was a significant difference among the results after these wash procedures. Magnesium content of hair was most affected by washing, containing less than half of the magnesium of the unwashed hair. The detergent wash removed the most zinc and magnesium; the acetone-ether-detergent wash removed the most copper. Our results indicate that the trace-element analysis of hair is sensitive to the preparation technique and therefore is an unreliable source of information about trace-element status.

scholarly journals Infrared radiation as a heat source in sample preparation of shrimp for trace element analysis

2019 ◽  
Vol 79 ◽  
pp. 107-113 ◽  
Author(s):  
Francisco L.F. da Silva ◽  
João P.S. Oliveira ◽  
Victor M. Campos ◽  
Sandro T. Gouveia ◽  
Lívia P.D. Ribeiro ◽  
...  
Keyword(s):  
Sample Preparation ◽  
Heat Source ◽  
Trace Element ◽  
Infrared Radiation ◽  
Trace Element Analysis ◽  
Element Analysis

What are we dating, volume diffusion or recrystallisation? Isotopic modelling and trace-element analysis as tools to interpret the high-temperature U-Pb thermochronometer in apatite and rutile

2020 ◽  
Author(s):  
Chris Mark ◽  
J. Stephen Daly ◽  
David Chew ◽  
Nathan Cogné
Keyword(s):  
High Temperature ◽  
Trace Element ◽  
Thermal History ◽  
Volume Diffusion ◽  
Trace Element Analysis ◽  
Granulite Facies ◽  
Forward Modelling ◽  
Earth Planet ◽  
Element Analysis ◽  
Thermal Histories

<p>The availability of high-temperature thermochronometers suitable for generation of continuous thermal histories at mid- to lower-crustal temperatures (i.e., ≥ 400 °C) is limited. Available thermochronometers include the recently developed apatite and rutile U-Pb thermochronometers ( ≤ 550 and 640 °C; Kooijman et al., 2010; Cochrane et al., 2014) and arguably the K-Ar system in white mica (sensitive to temperatures ≤ 500 °C. Recent work has focussed on micro-beam U-Pb analysis of apatite and rutile by sector-field and multi-collector LA-ICPMS to generate single-crystal U-Pb age profiles. Such profiles can be inverted to yield continuous thermal histories for high-temperature processes (e.g., Smye et al., 2018). However, both apatite and rutile can exhibit crystal growth and dissolution-reprecipitation reactions in the same temperature ranges at which measurable Pb diffusion occurs: neither behaves as a pure thermochronometer in all circumstances (e.g., Chambers and Kohn, 2012; Harlov et al., 2005). Thus, it is critical to develop protocols which unequivocally identify age profiles arising from volume diffusion.</p><p>Here, we present case studies from greenschist- to granulite-facies-grade metamorphic systems from the Eastern Alps and the Western Gneiss Region of Norway. We demonstrate the utility of trace-element analysis (Sr-Y-REE-Th-U) and isotopic forward modelling to discriminate age resetting arising from (re)crystallisation from diffusion. Both rutile and especially apatite routinely incorporate non-trivial amounts of common-Pb during crystallisation (as opposed to radiogenic Pb generated by <em>in-situ</em> radionuclide decay), rendering them discordant in U-Pb isotope space. This common-Pb must be corrected for during age calculation. However, common-Pb is isotopically distinct from radiogenic Pb but exhibits the same diffusion behaviour, so the predicted U-Pb isotopic distribution for a given crystal arising from a proposed thermal history can be estimated by isotopic forward modelling. Thus, common-Pb can be exploited to validate both the assumption of Pb-loss by volume diffusion, and the thermal history predicted by age profile inversion.</p><p><strong>Chambers</strong>, J.A., & Kohn, M.J., Am. Mineral., 97, 543–555 (2012); <strong>Cochrane</strong>, R., et al., Geochim. Cosmochim. Acta, 127, 39–56, (2014); <strong>Harlov</strong>, D.E., et al., Contrib. Mineral. Petrol, 150, 268–286 (2005); <strong>Kooijman</strong>, E., et al., Earth Planet. Sci. Lett, 293, 321–330, (2010); <strong>Smye</strong>, A.J., et al., Chem. Geol., 494, 1–18 (2018).</p>

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