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Comparison of water isotope analysis between cavity ring-down spectroscopy and isotope ratio mass spectrometry
oxygen isotopes hydrogen isotopes water isotope ratio mass spectrometry (IRMS) cavity ring-down spectroscopy (CRDS)
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2017/4/10
δD and δ18O of natural waters with δ18O ranging from –24 to –6‰ were measured using a cavity ring-down spectroscopy
(CRDS) in order to confirm that the CRDS method can be an alternative to convention...
Stable chlorine isotope ratio analysis of subnanomolar level methyl chloride by continuous-flow isotope ratio mass spectrometry
stable chlorine isotope ratio continuous flow isotope ratio mass spectrometry methyl chloride
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2017/4/11
An analytical system using continuous-flow isotope ratio mass spectrometry (CF-IRMS) was developed to determine
the stable chlorine isotope ratios (δ37Cl) for CH3Cl. By using appropriate devices for ...
Isotopic ratio of radioactive iodine (129I/131I) released from Fukushima Daiichi NPP accident
Fukushima iodine accelerator mass spectrometry isotopic ratio soil
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2017/4/11
In March 2011, there was an accident at the Fukushima Daiichi Nuclear Power Plant (NPP) and a discharge of
radionuclides resulting from a powerful earthquake. Considering the impact on human health, ...
Mn/Ca ratio in planktonic foraminifer from ODP Site 1144, the northern South China Sea: A possible paleoclimate indicator
planktonic foraminifer Mn/Ca ratios paleoclimate proxy South China Sea ODP
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2017/8/9
We report here high-resolution Mn/Ca ratios of planktonic foraminifer, Globigerinoides sacculifer from ODP Site 1144 in the northern South China Sea (SCS). The variation pattern of the Mn/Ca ratios of...
Interactions between sediment resuspension and sediment quality decrease the TN:TP ratio in a shallow lake
Interactions between sediment resuspension sediment quality decrease the TN TP ratio in a shallow lake
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2014/4/21
The relative contributions of sediment resuspension and external nutrient loading to seasonal fluctuations of the total nitrogen to total phosphorus (TN : TP) ratio in the water column of the shallow ...
Geochemical implication of 87Sr/86Sr ratio of high-temperature deep groundwater in a fractured granite aquifer
87Sr/86Sr ratio fractured granite aquifer thermal water time lag indicator groundwater cycle
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2017/8/10
The Dongrae thermal water area located at the southeast margin of the Korean Peninsula is one of the oldest hot springs in Korea and has been used in spas since the 9th Century. In this paper, a geoch...
New sequential separation procedure for Sr, Nd and Pb isotope ratio measurement in geological material using MC-ICP-MS and TIMS
Sr Nd isotope ratio MC-ICP-MS TIMS
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2017/8/10
A new 3-step sequential separation chemistry for Sr, Nd and Pb from silicate samples, which is suitable for isotope analysis by MC-ICP-MS as well as TIMS, has been developed. The chemistry is designed...
Determination of 9Be in geological standard samples, JA-2 and JB-2, and of 9Be and 10Be in a basaltic rock sample for evaluation of uncertainty involved in 10Be/9Be ratio measurements
10Be 9Be ICP-MS AMS uncertainty
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2017/8/10
We determined the concentrations of 9Be in JB-2 and JA-2 geological standard samples using an inductively coupled plasma mass spectrometer (ICP-MS). We determined 9Be abundance in standard samples of ...
Isotope-ratio detection for gas chromatography
Combustion interface / Compound-specific isotope analysis GC-isotope-ratio mass spectrometry sotope-ratio-monitoring Pyrolysis interface /
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2014/4/8
Instrumentation and methods exist for highly precise analyses of the stable-isotopic
composition of organic compounds separated by GC. The general approach combines a conventional GC, a chemical reac...
Correction of H3 + Contributions in Hydrogen Isotope Ratio Monitoring Mass Spectrometry
Hydrogen Isotope Ratio Monitoring Mass Correction
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2014/4/8
Two fundamentally different approaches, termed “pointwise” and “peakwise,” are currently used to correct
hydrogen isotope ratio monitoring data for the presence
of H3
+
ion contributions. Consider...
Flocculation of Illite/Kaolinite and Illite/Montmorillonite Mixtures as Affected by Sodium Adsorption Ratio and pH
Flocculation value Critical coagulation concentration Dispersion Aggregation
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2012/1/4
The effect of electrolyte concentration, exchangeable sodium percentage (ESP), sodium adsorption ratio (SAR), and pH on the flocculation-dispersion behavior of 50/50 mixtures of reference illite with ...
Effect of SiO2/Al2O3 Ratio on the Thermal Reactions of Allophane. II. Infrared and X-Ray Powder Diffraction Data
Allophane Imogolite Infrared spectroscopy Silica/alumina ratio Thermal stability X-ray powder diffraction
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2012/2/8
Allophanes with SiO2/Al2O3 molar ratios from 1.38 to 1.92 were heated at temperatures up to 500°C, and the changes induced were investigated by means of infrared spectroscopy (IR) and X-ray powder dif...
Effect of SiO2/Al2O3 Ratio on the Thermal Reactions of Allophane
Allophane Dehydration Dehydroxylation DTA Silica/alumina ratio Thermal reactions
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2012/2/8
Differences were found in the differential thermal analysis curves and in the temperatures of new-phase development between allophanes of high (1.91–1.99) and low (1.47–1.53) SiO2/Al2O3 ratios. The en...
Kaolinite Synthesis: The Role of the Si/Al and (Alkali)/(H +) Ratio in Hydrothermal Systems
Kaolinite Synthesis Hydrothermal Systems Ratio
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2012/2/14
The Si/Al ratio of an hydrothermal system plays an important role in kaolinite synthesis. If the atomic Si/Al ratio of a system is greater than 2·0, kaolinite will disappear at 345 ± 5°C and 2 kbars w...
Deferration Effect on Structural Ferrous-Ferric Iron Ratio and CEC of Vermiculites and Soils
Deferration Structural Ferrous-Ferric Iron Ratio CEC Vermiculites Soils
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2012/2/21
Deferration by reduction of free Fe2O3 with Na2S2O4 in the presence of Na citrate and NaHCO3 caused a change in valence state of 10 to 35 per cent of the total structural iron in micaceous vermiculite...