Determination of TOC and TN

TOC and TN were measured using an Elementar Vario EL cube EA with decarbonated samples following the method of Chen et al. (47 ). Quality control checks were performed on every 10th sample, including sample duplicates, analysis of certified reference materials (acetanilide), and analysis of blanks. The measurement precision was better than ±0.1 wt % for TOC and ±0.3 wt % for TN.

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Liu Q., Li P., Jiang L., Jin Z., Liang X., Zhu D., Pang Q., Zhang R, & Liu J. (2024). Distinctive volcanic ash–rich lacustrine shale deposition related to chemical weathering intensity during the Late Triassic: Evidence from lithium contents and isotopes. Science Advances, 10(11), eadi6594.

Publication 2024

Corresponding Organization : State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation

Other organizations : Institute of Geology and Geophysics, Chinese Academy of Sciences

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Variable analysis

independent variables

None explicitly mentioned

dependent variables

TOC (total organic carbon)
TN (total nitrogen)

control variables

Decarbonated samples
Quality control checks performed on every 10th sample, including sample duplicates, analysis of certified reference materials (acetanilide), and analysis of blanks

controls

Positive control: Analysis of certified reference materials (acetanilide)
Negative control: Analysis of blanks

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