English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

Serial oxidation coupled with stable carbon and radiocarbon analysis of\udsequentially evolved CO2 is a promising method to characterize the\udrelationship between organic carbon (OC) chemical composition, source, and\udresidence time in the environment. However, observed decay profiles depend on\udexperimental conditions and oxidation pathway. It is therefore necessary to\udproperly assess serial oxidation kinetics before utilizing decay profiles as\uda measure of OC reactivity. We present a regularized inverse method to\udestimate the distribution of OC activation energy (E), a proxy for bond\udstrength, using serial oxidation. Here, we apply this method to ramped\udtemperature pyrolysis or oxidation (RPO) analysis but note\udthat this approach is broadly applicable to any serial oxidation technique.\udRPO analysis directly compares thermal reactivity to isotope composition by\uddetermining the E range for OC decaying within each temperature interval\udover which CO2 is collected. By analyzing a decarbonated test sample\udat multiple masses and oven ramp rates, we show that OC decay during RPO\udanalysis follows a superposition of parallel first-order kinetics and that\udresulting E distributions are independent of experimental conditions. We\udtherefore propose the E distribution as a novel proxy to describe OC\udthermal reactivity and suggest that E vs. isotope relationships can provide\udnew insight into the compositional controls on OC source and residence time

Technical note: An inverse method to relate organic carbon reactivity to isotope composition from serial oxidation