Quantitative Conversion of Sulfate Oxygen for High-Precision Triple Oxygen Isotope Analysis.

Anal Chem

International Center for Isotope Effects Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, China.

Published: December 2024

AI Article Synopsis

  • - The research introduces a new method called R-D-E for analyzing triple oxygen isotope composition (Δ'O) of sulfate, which significantly improves conversion efficiency, achieving nearly complete conversion to CO, unlike previous methods that had partial yields.
  • - The R-D-E method demonstrates superior precision in Δ'O measurements and requires less sample size (just 4 μmol of sulfate) compared to the common CO-laser-fluorination technique, allowing for simultaneous determination of both Δ'O and δO.
  • - Results reveal that traditional techniques may produce Δ'O values that are notably higher (10-200 per meg) due to incomplete sulfate oxygen conversion, emphasizing the need for recalibration of existing data for accurate interpretation of sulfate Δ'O values.

Article Abstract

Triple oxygen isotope composition (Δ'O) of sulfate carries information on the sulfur cycle as well as signatures of atmospheric O, O, and surface water of the geological past. However, existing analytical techniques can only achieve a partial oxygen yield during the conversion from sulfate to the analyte O, which results in isotope fractionation and impedes the Δ'O comparison with other oxygen-bearing compounds (e.g., HO) on the VSMOW-SLAP scale. Here, we present an analytical method involving high-temperature graphite reduction, CO discharge, and Pt-catalyzed CO-O isotope exchange, the R-D-E method, that achieves ∼100% conversion of sulfate oxygen to CO. Compared with the widely used CO-laser-fluorination technique, our R-D-E method has a better Δ'O precision (9 per meg) and requires a smaller sample amount, as low as 4 μmol of sulfate (equivalent to 1 mg BaSO), with both Δ'O and δO being determined simultaneously. Using this method, we report the triple oxygen isotope compositions of three international reference materials (NBS-127, IAEA-SO-5, and IAEA-SO-6) and three in-house references on the VSMOW-SLAP scale. We found that the sulfate Δ'O values measured on the partially yielded O from the fluorination technique are 10-200 per meg higher than those obtained by our R-D-E method, depending on the oxidant used (e.g., F or BrF). Incomplete conversion of sulfate oxygen during the high-temperature graphite reduction would result in lower δO and higher Δ'O values. This work highlights the needs for recalibration and reinterpretation of the published sulfate Δ'O data when sulfate Δ'O values of interest are small.

Download full-text PDF

Source
http://dx.doi.org/10.1021/acs.analchem.4c03683DOI Listing

Publication Analysis

Top Keywords

conversion sulfate
16
sulfate oxygen
12
triple oxygen
12
oxygen isotope
12
r-d-e method
12
sulfate Δ'o
12
Δ'o values
12
sulfate
9
Δ'o
8
vsmow-slap scale
8

Similar Publications

Succinonitrile Electrolyte Additive for Stabilizing Aqueous Zinc Metal Batteries.

ACS Appl Mater Interfaces

December 2024

MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, West Dazhi 92, Harbin 150001, People's Republic of China.

The utilization of water electrolytes in zinc-ion batteries offers the advantages of enhanced safety, reduced cost, and improved environmental friendliness, rendering them an optimal choice for replacing lithium-ion batteries. Nevertheless, the conventional zinc sulfate electrolyte fails to meet stringent requirements. Therefore, developing electrolytes is crucial for addressing the low cycle life of zinc ions and suppressing the growth of zinc dendrites.

View Article and Find Full Text PDF

The rise in global biodiesel production leads to the surplus of glycerol as a byproduct, necessitating its industrial application in various chemicals to sustain the biodiesel industry economically. Solketal is one of the value-added chemicals in the biodiesel industry with numerous applications in the food, polymer, and chemical industries and as a fuel additive. Nowadays, researchers mainly focus on synthesizing solketal using biowaste glycerol obtained from the biodiesel industry due to its immense applications.

View Article and Find Full Text PDF

Introduction: This study aimed to assess the protective efficacy of MF-06 as a potential alternative to antibiotics in mitigating intestinal mucosal damage in chicks infected with .

Methods: A total of 150 one-day-old SPF chicks were selected and randomly divided into five groups: control group (CK), probiotics group (EM), probiotics treatment group (PT), antibiotic treatment group (AT), group (SI), CK, AT and SI groups were fed a basal diet, EM and PT groups were fed a basal diet supplemented with 1.0 × 10 CFU/g ; PT, AT and SI groups were gavaged with 1.

View Article and Find Full Text PDF

In recent years, biorefining Municipal Solid Waste (MSW) has gained attention as a promising solution to the challenges of waste management and resource shortages, while also advancing sustainability goals. This research focuses on the European Union, analyzing the material flow and sustainability of biorefining systems and evaluating their impact on society, the economy, and the natural environment. The final products of the integrated material recovery processes, including recycling (18.

View Article and Find Full Text PDF

Unlocking new electron transport routes: Insights into enhanced long-chain fatty acid conversion in valorization of lipid-rich waste.

Bioresour Technol

December 2024

School of Water Conservancy and Transportation, Zhengzhou University, Zhengzhou 450001, China. Electronic address:

In this study, the alkaline fermentation of combined lipid-rich waste (LRW) was explored to produce volatile fatty acids (VFAs). By introducing sulfate as an external electron acceptor, the long-chain fatty acid (LCFA) metabolic pathway was enhanced, achieving a VFA yield of 671.1 ± 21.

View Article and Find Full Text PDF

Want AI Summaries of new PubMed Abstracts delivered to your In-box?

Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!