Analysis of Re, Au, Pd, Pt and Rh in NIST Glass Certified Reference Materials and Natural Basalt Glasses by Laser Ablation ICP-MS

1997 ◽  
Vol 21 (2) ◽  
pp. 215-229 ◽  
Author(s):  
Paul J. Sylvester ◽  
Stephen M. Eggins
Keyword(s):  
Laser Ablation ◽  
Reference Materials ◽  
Certified Reference Materials ◽  
Icp Ms ◽  
Basalt Glasses

scholarly journals Assessment of Five Monazite Reference Materials for U-Th/Pb Dating Using Laser-Ablation ICP-MS

Geosciences ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 391
Author(s):  
Richter ◽  
Nebel-Jacobsen ◽  
Nebel ◽  
Zack ◽  
Mertz-Kraus ◽  
...  
Keyword(s):  
Laser Ablation ◽  
Reference Material ◽  
Reference Materials ◽  
Operational Conditions ◽  
Inductively Coupled ◽  
Phosphate Mineral ◽  
Icp Ms ◽  
Wide Range ◽  
Absolute Age ◽  
Key Aspects

Monazite is a common accessory phosphate mineral that occurs under a wide range of pressure and temperature conditions in sedimentary, metamorphic and igneous rocks. Monazite contains high amounts of Th and U, rendering single monazite grains suitable for in-situ U-Th/Pb dating using laser ablation inductively-coupled mass spectrometry (LA-ICP-MS). Two key aspects of monazite dating that are critical for accurate age data with maximum precision are (i) optimized instrumental conditions to minimize analytical scatter and (ii) a well characterized reference material to ensure the accuracy of the obtained aged. Here, we analyzed five monazite reference materials (USGS 44069, 94-222, MAdel, Moacir and Thompson Mine Monazite) for their U-Th/Pb ages using LA-ICP-MS technique and applied a variety of laser spot diameters and repetition rates to find the best operational conditions to achieve accurate age data while maintaining maximum precision. We find that a spot diameter of 10 µm and a repetition rate of 10 Hz yield the most precise ages with a deviation of ±2.0% from their respective high-precision U/Pb literature age data. Ages were reproduced in three different LA-ICP-MS laboratories using these parameters. Each reference material was tested for its suitability as a matrix-matched age reference material. For this, a rotating, iterative approach was adopted in which one reference monazite was used as calibration reference material against all others, which were treated as unknowns. The results reveal that USGS 44069, 94-222, Thompson Mine Monazite and MAdel all agree with their respective calculated ages and ID-TIMS reference ages and thus are suggested as suitable calibration reference materials. Moacir, however, appears slightly older than previously suggested (up to 4%), thus, caution is advised here when using Moacir as reference material for U-Th/Pb LA-ICP-MS dating in the absence of further absolute age calibration.

scholarly journals 230Th-234U model ages of some uranium standard reference materials

2011 ◽  
Vol 1 (1) ◽  
pp. 31-35 ◽  
Author(s):  
R. W. Williams ◽  
A. M. Gaffney
Keyword(s):  
Reference Materials ◽  
Closed System ◽  
Half Life ◽  
Certified Reference Materials ◽  
Isotope Dilution Mass Spectrometry ◽  
Standard Reference Materials ◽  
National Bureau ◽  
System Behavior ◽  
Icp Ms ◽  
Solid Form

Abstract The “age” of a sample of uranium is an important aspect of a nuclear forensic investigation and of the attribution of the material to a source. The 230Th- 234U chronometer can be used to determine the production date of even very recently-produced material ( 234U half life = 245250 ± 490 years; 230Th half life = 75690 ± 230 years [1]), provided that the 230Th/234U at the time of formation is known, and that there has been no Th-U fractionation in the sample since production. For most samples of uranium, ages determined with this chronometer are “model ages”, because they are based on the assumptions of a) some initial amount of 230Th in the sample, and b) closed-system behavior of the sample since production. The uranium standard reference materials originally prepared and distributed by the former US National Bureau of Standards and now distributed by New Brunswick Laboratory as certified reference materials (NBS SRM = NBL CRM) are good candidates for materials where these assumptions may be tested. The U isotopic standards have known purification and production dates and closed-system behavior in the solid form (U3O8) may be reliably assumed. In addition, these materials are widely available and can serve as informal round-robin inter-laboratory comparison samples. We determined 230Th-234U model ages for seven of these isotopic standards by isotope dilution mass spectrometry using a multi-collector ICP-MS. The standards dated for this study are U005-A, U010, U030-A, U100, U850, U900 and U970. Model ages obtained range from ∼ 30 to ∼ 52 years ago (reference date: 5-May-2009). The model age of U100 is the same as the purification date, within uncertainty. The other six standards analyzed all give model ages older than the purification dates of record. The magnitude of the discrepancy between model age and purification date does not correlate with the model age or the amount of 232Th in the samples. This indicates that excess 230Th in these six standards results from incomplete purification during production.

scholarly journals Accurate measurement of uranium isotope ratios in solid samples by laser ablation multi-collector inductively coupled plasma mass spectrometry

2018 ◽  
Vol 33 (6) ◽  
pp. 1076-1080 ◽  
Author(s):  
Z. Varga ◽  
M. Krachler ◽  
A. Nicholl ◽  
M. Ernstberger ◽  
T. Wiss ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Laser Ablation ◽  
Inductively Coupled Plasma ◽  
Certified Reference Materials ◽  
Isotope Ratios ◽  
Uranium Isotope ◽  
Solid Samples ◽  
Inductively Coupled ◽  
Icp Ms ◽  
Plasma Mass Spectrometry

A multi-collector inductively coupled plasma mass spectrometer (MC-ICP-MS) coupled to a 213 nm ns-laser was used to measure uranium isotope ratios (234U/238U, 235U/238U, and 236U/238U) in six solid nuclear certified reference materials (CRMs).

Characterization of zircon reference materials via high precision U–Pb LA-MC-ICP-MS

2017 ◽  
Vol 32 (10) ◽  
pp. 2011-2023 ◽  
Author(s):  
Cristiano Lana ◽  
Federico Farina ◽  
Axel Gerdes ◽  
Ana Alkmim ◽  
Guilherme O. Gonçalves ◽  
...  
Keyword(s):  
Laser Ablation ◽  
High Precision ◽  
Robust Stability ◽  
Reference Materials ◽  
Icp Ms ◽  
Higher Sensitivity

Recent improvements in laser ablation and multicollector (MC)-ICP-MS technology offer higher sensitivity, robust stability, and larger dynamic ranges.

scholarly journals Alkali element background reduction in laser ICP-MS

2014 ◽  
Vol 4 (2) ◽  
pp. 609-626
Author(s):  
C. W. Magee ◽  
C. A. Norris
Keyword(s):  
Laser Ablation ◽  
Reference Materials ◽  
Detection Limits ◽  
Background Reduction ◽  
Extraction Field ◽  
Novel Approach ◽  
Icp Ms ◽  
Alkali Glass ◽  
High Alkali ◽  
Alkali Elements

Abstract. Alkali backgrounds in laser ablation ICP-MS analyses can be enhanced by electron-induced ionization of alkali contamination on the skimmer cone, reducing effective detection limits for these elements. Traditionally, this problem is addressed by isolating analyses of high alkali materials onto a designated cone set, or by operating the ICP-MS in a "soft extraction" mode, which reduces the energy of electrons repelled into the potentially contaminated sampling cone by the extraction field. Here we present a novel approach, where we replace the traditional alkali glass tuning standards with synthetic low-alkali glass reference materials. Using this vitreous tuning solution, we find that this approach reduces the amount of alkali contamination produced, halving backgrounds for the heavy alkali elements without any change to analytical procedures. Using segregated cones is still the most effective method for reducing lithium backgrounds, but since the procedures are complimentary both can easily be applied to the routine operations of an analytical lab.

Determination of REE, Y, Nb, Zr, Hf, Ta, Th and U in Geological Reference Materials LSHC-1 and Amf-1 by Solution and Laser Ablation ICP-MS

2010 ◽  
Vol 34 (1) ◽  
pp. 49-65 ◽  
Author(s):  
Elena V. Smirnova ◽  
Belinda Flem ◽  
Elena A. Anchutina ◽  
Irina N. Mysovskaya ◽  
Valeriy I. Lozhkin ◽  
...  
Keyword(s):  
Laser Ablation ◽  
Reference Materials ◽  
Icp Ms
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