scholarly journals Fingerprinting Paranesti Rubies through Oxygen Isotopes

Minerals ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 91 ◽  
Author(s):  
Kandy Wang ◽  
Ian Graham ◽  
Laure Martin ◽  
Panagiotis Voudouris ◽  
Gaston Giuliani ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Oxygen Isotopes ◽  
Narrow Range ◽  
Mean Value ◽  
Ionization Mass ◽  
Crustal Structures ◽  
In Situ Methods ◽  
Secondary Ionization Mass Spectrometry ◽  
Laser Fluorination

In this study, the oxygen isotope (δ18O) composition of pink to red gem-quality rubies from Paranesti, Greece was investigated using in-situ secondary ionization mass spectrometry (SIMS) and laser-fluorination techniques. Paranesti rubies have a narrow range of δ18O values between ~0 and +1‰ and represent one of only a few cases worldwide where δ18O signatures can be used to distinguish them from other localities. SIMS analyses from this study and previous work by the authors suggests that the rubies formed under metamorphic/metasomatic conditions involving deeply penetrating meteoric waters along major crustal structures associated with the Nestos Shear Zone. SIMS analyses also revealed slight variations in δ18O composition for two outcrops located just ~500 m apart: PAR-1 with a mean value of 1.0‰ ± 0.42‰ and PAR-5 with a mean value of 0.14‰ ± 0.24‰. This work adds to the growing use of in-situ methods to determine the origin of gem-quality corundum and re-confirms its usefulness in geographic “fingerprinting”.

scholarly journals Stepwise chemical abrasion ID-TIMS-TEA of microfractured Hadean zircon

2019 ◽  
Author(s):  
C. Brenhin Keller ◽  
Patrick Boehnke ◽  
Blair Schoene ◽  
T. Mark Harrison
Keyword(s):  
Mass Spectrometry ◽  
High Spatial Resolution ◽  
Ionization Mass ◽  
Zircon Population ◽  
Temporal Precision ◽  
Analysis Techniques ◽  
Secondary Ionization Mass Spectrometry ◽  
Jack Hills ◽  
Terrestrial Material

Abstract. The Hadean Jack Hills zircons represent the oldest known terrestrial material, providing a unique and truly direct record of Hadean Earth history. This zircon population has been extensively studied via high spatial resolution, high throughput in situ isotopic and elemental analysis techniques such as secondary ionization mass spectrometry (SIMS), but not by comparatively destructive, high-temporal-precision (

scholarly journals Chlorine activation by N<sub>2</sub>O<sub>5</sub>: simultaneous, in situ detection of ClNO<sub>2</sub> and N<sub>2</sub>O<sub>5</sub> by chemical ionization mass spectrometry

2009 ◽  
Vol 2 (1) ◽  
pp. 119-151 ◽  
Author(s):  
J. P. Kercher ◽  
T. P. Riedel ◽  
J. A. Thornton
Keyword(s):  
Mass Spectrometry ◽  
Detection Limit ◽  
Chemical Ionization ◽  
Ionization Mass Spectrometry ◽  
Chemical Ionization Mass Spectrometry ◽  
Ionization Mass ◽  
Nitrate Anion ◽  
Detection Scheme ◽  
In Situ Detection

Abstract. We report a new method for the simultaneous in situ detection of nitryl chloride (ClNO2) and dinitrogen pentoxide (N2O5) using chemical ionization mass spectrometry (CIMS). The technique relies on the formation and detection of iodide ion-molecule clusters, I(ClNO2)− and I(N2O5)−. The novel N2O5 detection scheme is direct. It does not suffer from high and variable chemical interferences, which are associated with the typical method of nitrate anion detection. We address the role of water vapor, electric field strength, and instrument zero determinations, which influence the overall sensitivity and detection limit of this method. For both species, the method demonstrates high sensitivity (>1 Hz/pptv), precision (~10% for 100 pptv in 1 s), and accuracy (~20%), the latter ultimately determined by the nitrogen dioxide (NO2) cylinder calibration standard and characterization of inlet effects. For the typically low background signals (<10 Hz) and high selectivity, we estimate signal-to-noise (S/N) ratios of 2 for 1 pptv in 60 s averages, but uncertainty associated with the instrumental zero currently leads to an ultimate detection limit of ~5 pptv for both species. We validate our approach for the simultaneous in situ measurement of ClNO2 and N2O5 while on board the Research Vessel (RV) Knorr as part of the ICEALOT 2008 Field Campaign.

Time-resolved in situ monitoring of photocatalytic reactions by probe electrospray ionization mass spectrometry

The Analyst ◽  
2020 ◽  
Vol 145 (9) ◽  
pp. 3313-3319
Author(s):  
Zhongbao Han ◽  
Xiaoyu Gu ◽  
Shirong Wang ◽  
Liyan Liu ◽  
Ying Wang ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Electrospray Ionization ◽  
Real Time ◽  
Electrospray Ionization Mass Spectrometry ◽  
In Situ Monitoring ◽  
Ionization Mass ◽  
Time Resolved ◽  
Photocatalytic Reactions ◽  
Probe Electrospray Ionization

We report the application of PESI-MS to in situ monitoring of photocatalytic reactions of cationic dyes in suspensions in real-time.

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