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A method is presented for measuring organic carbon in both carbonate‐rich and carbonate‐poor marine sediments. Samples are sonicated with phosphoric acid to remove carbonates. The spent acid supernatant is analyzed for dissolved organic carbon, the solid residue for total carbon; their sum yields the organic carbon content of the sample. The technique is free from carbonate interferences, involves no losses due to acid solubilization, and has excellent precision (better than ±0.02% C org ) and accuracy (better than ±2%).
Philip N. Froelich (Thu,) studied this question.