scholarly journals Specific of Stable Carbon Isotopes Determination in Organic-Bearing Sediments

2021 ◽  
Vol 14 (3) ◽  
pp. 418-432
Author(s):  
Elena V. Lazareva ◽  
Keyword(s):  
Hydrogen Peroxide ◽  
Bottom Sediments ◽  
Stable Carbon Isotopes ◽  
Elevated Temperatures ◽  
Standard Procedure ◽  
Carbon Isotopic Composition ◽  
Stable Carbon ◽  
Uzon Caldera ◽  
Carbon Isotopic ◽  
Two Samples

The study of the carbon isotopic composition in organic-bearing bottom sediments of the thermal lake Fumarolnoye (Uzon caldera, Kamchatka) has been carried out. The results of studying δ13C changes in the bottom sediments of a thermal lake during the sequential extraction of H3PO4 for 2 hours, 24 hours and 7 days are presented. The change in δ13С with time and after treatment with HCl and H2O2 is shown using two samples as an example. After treatment with HCl, the δ13С values change relative to the initial ones from 1 to 3 ‰, which can be taken into account when interpreting the data. The standard procedure for removing carbonate with hydrogen peroxide reveals a significant transformation of the residual C‑containing substance in the case of a prolonged reaction with H3PO4 at elevated temperatures

scholarly journals Stable Carbon Isotopes of Phytoplankton as a Tool to Monitor Anthropogenic CO2 Submarine Leakages

Water ◽  
2020 ◽  
Vol 12 (12) ◽  
pp. 3573
Author(s):  
Federica Relitti ◽  
Nives Ogrinc ◽  
Michele Giani ◽  
Federica Cerino ◽  
Mirta Smodlaka Smodlaka Tankovic ◽  
...  
Keyword(s):  
Isotopic Composition ◽  
Stable Carbon Isotopes ◽  
Inorganic Carbon ◽  
Dissolved Inorganic Carbon ◽  
Carbon Isotopic Composition ◽  
Stable Carbon ◽  
Carbonate System ◽  
Δ13c Values ◽  
Carbon Isotopic ◽  
Anthropogenic Co2

This study aims to validate the stable carbon isotopic composition (δ13C) of phytoplankton as a tool for detecting submarine leakages of anthropogenic CO2(g), since it is characterised by δ13C values significantly lower than the natural CO2 dissolved in oceans. Three culture experiments were carried out to investigate the changes in δ13C of the diatom Thalassiosira rotula during growth in an artificially modified medium (ASW). Three different dissolved inorganic carbon (DIC) concentrations were tested to verify if carbon availability affects phytoplankton δ13C. Simultaneously, at each experiment, T. rotula was cultured under natural DIC isotopic composition (δ13CDIC) and carbonate system conditions. The available DIC pool for diatoms grown in ASW was characterised by δ13CDIC values (−44.2 ± 0.9‰) significantly lower than the typical marine range. Through photosynthetic DIC uptake, microalgae δ13C rapidly changed, reaching significantly low values (until −43.4‰). Moreover, the different DIC concentrations did not affect the diatom δ13C, exhibiting the same trend in δ13C values in the three ASW experiments. The experiments prove that phytoplankton isotopic composition quickly responds to changes in the δ13C of the medium, making this approach a promising and low-impact tool for detecting CO2(g) submarine leakages from CO2(g) deposits.

scholarly journals Stable Carbon Isotopic Composition in Annual Rings of a Pine Tree (Pinus Densiflora) from Yeongwol, Korea: Possible Application to Climate Study

Radiocarbon ◽  
2017 ◽  
Vol 59 (2) ◽  
pp. 373-381
Author(s):  
Chi-Hwan Kim ◽  
Jang Hoon Lee ◽  
Jin Kang ◽  
Sujin Song ◽  
Myung-ho Yun ◽  
...  
Keyword(s):  
Tree Rings ◽  
Pinus Densiflora ◽  
Stable Carbon Isotope ◽  
Carbon Isotopic Composition ◽  
Precipitation Data ◽  
Stable Carbon ◽  
Climate Data ◽  
Carbon Isotopic ◽  
Pine Tree ◽  
Paleoclimate Proxy

AbstractStable carbon isotope ratios were measured on the alpha-cellulose in tree rings of a pine tree (Pinus densiflora) from Yeongwol, Korea. We developed an annual-resolution δ13C series (1835–1905) by correcting the measured data for changes in δ13C of air to minimize non-climatic influences. To investigate the climatic signal in the δ13C series, we performed correlation analysis between δ13C and the Cheugugi climate data. The Cheugugi precipitation data were first recorded by King Sejong (1397–1450) of the Joseon Dynasty. However, the longest set of precipitation data available is the one collected in Seoul (1776–1907). Although many studies support the reliability of the Cheugugi data, no previous studies have investigated the potential of the δ13C signal in tree rings as paleoclimate proxy using the Cheugugi data. Recent precipitation trends in Yeongwol are quite similar to that of Seoul, and we found significant correlations between the Cheugugi data and the δ13C series. We suggest further studies to replicate these results and confirm whether comparing δ13C variations in tree rings and Cheugugi data is a useful method of investigating the potential of the δ13C signal as a paleoclimate proxy in or near the Korean peninsula.

scholarly journals Environmental influences on the stable carbon isotopic composition of Devonian and Early Carboniferous land plants

2019 ◽  
Vol 531 ◽  
pp. 109100 ◽  
Author(s):  
Zhenzhu Wan ◽  
Thomas J. Algeo ◽  
Patricia G. Gensel ◽  
Stephen E. Scheckler ◽  
William E. Stein ◽  
...  
Keyword(s):  
Isotopic Composition ◽  
Environmental Influences ◽  
Carbon Isotopic Composition ◽  
Early Carboniferous ◽  
Land Plants ◽  
Stable Carbon ◽  
Carbon Isotopic

scholarly journals Radiocarbon in Porewater of Continental Shelf Sediments (Southeast Mediterranean)

Radiocarbon ◽  
2004 ◽  
Vol 46 (2) ◽  
pp. 633-642 ◽  
Author(s):  
O Sivan ◽  
B Lazar ◽  
E Boaretto ◽  
Y Yechieli ◽  
B Herut
Keyword(s):  
Sediment Cores ◽  
Carbon Isotopic Composition ◽  
Mediterranean Coast ◽  
Shelf Water ◽  
Stable Carbon ◽  
Last Glacial Period ◽  
Carbon Isotopic ◽  
Shelf Sediments ◽  
Water Depths ◽  
The Last Glacial

In this study, we aim to characterize the main processes controlling 14CDIC concentrations in porewater at the shallow shelf (water depth less than 120 m) off the Mediterranean coast of Israel. At these water depths, we expected to find evidence for seawater penetration toward the coast, since this area was flooded by seawater only some 18,000 yr ago (the end of the Last Glacial period).Measurements of the chemical composition (14CDIC) and stable carbon isotopic composition (δ13CDIC) were performed in several sediment cores (40–250 cm long) at water depths between 6 and 115 m. At water depths of 60 m, represented by a 2.5-m-long sediment core, the porewater 14CDIC levels (85–87 pMC) were lower than the corresponding sediment values in each layer (92–95 pMC), mainly due to the oxidation of relatively old organic matter (about 70 pMC) with no evidence to advection. In contrast, sediment cores from water depths shallower than 50 m showed only slight anaerobic oxidation and high 14CDIC values of approximately 100 pMC, indicating possible downward advection. These geochemical observations support the perception that the penetration of seawater into the coastal aquifer occurs at the shallow water zone (<50 m), while further verification by deeper cores is required.

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