Stable isotopic values

Ebook "Calcium stable isotope geochemistry (Advances in isotope geochemistry series)" provides an overview of the fundamentals and reference values for Ca stable isotope research, as well as current analytical methodologies including detailed instructions for sample preparation and isotope analysis. As such, it introduces readers to the different fields of application, including low-temperature mineral precipitation and biomineralisation, Earth surface processes and global cycling, high-temperature processes and cosmochemistry, and lastly human studies and biomedical applications.

269p duongthandue0501 28-02-2024 1 1   Download

The present study aims to determine the role of the carbon source from mangroves to provide the organic matter in intertidal sediments by the stable isotopes approach. The present results suggested that mangroves are important in accumulating organic carbon and fine–grained sediments in the Tien Yen Bay, contributing important values to climate change mitigation and maintaining biodiversity in this area.

10p viironman 02-06-2023 5 3   Download

In this study seasonal changes in the geochemical and stable isotope compositions of Hisaralan thermal waters in Simav Graben, western Turkey, were investigated with regards to a variety of mineral-water interactions and mixing processes. The Hisaralan and Emendere geothermal waters, with temperatures of up to 99 °C, were mostly of Na-HCO3 and Ca-HCO3 types. The δ18O and δ2 H values of the Hisaralan waters ranged from –9.32‰ to –8.73‰ and –65.02‰ to –61.10‰, with maximum seasonal differences of 0.3‰ and 1.8‰. The Emendere waters were represented by a more positive range of δ2 H values (–54.

22p tanmocphong 29-01-2022 12 1   Download

"The journal of Nuclear science and technology - Volume 9/Number 3, 2019" present nuclear transmutation of long-lived fission product i-129 in radial blanket of sodium-cooled fast reactor; calculation results for enhancing ability of I-131 radioisotope production using tellurium dioxide target on the dalat nuclear research reactor; temporal variation of stable isotopic values for dissolved nitrogen compounds in paddy water environment...

59p trinhthamhodang1218 14-03-2021 12 1   Download

In points of annual crop farming and close to residential the contribution of inorganic fertilizers to the total concentration of nitrate was estimated, based on the δ 15N-NO3 values, to be as high as more than 60% and the contribution of water waste was around 35-40%. This is the first time isotopic signature of nitrogen-15 in nitrate (δ15N-NO3) was applied as a tool to assess and identify sources of the nutrient in aquatic environment.

12p trinhthamhodang1218 14-03-2021 12 2   Download

The present study implied that not only chemical fertilizers but also irrigation water was the major source of nitrogen into the paddy. In addition, microbiological nitrification and denitrification were presumed based on the temporal isotopic variations.

6p trinhthamhodang1218 14-03-2021 12 2   Download

Nuclear isotopes making experimental gamma energy spectrum are denoted via their energies. One energy level of an isotope is supposed presence in the spectrum, if there is an energy level that is different from it with a value less than its error. With suitable database, the program can be used to identify isotopes even stable isotopes by using α, β , X spectra.

6p tuanlocmuido 19-12-2012 51 1   Download