An improved method for analysis of oxygen isotope in organic matter

Conclusions  

1.	The high-temperature pyrolysis reaction of cellulose and organic matter have an optimal reaction condition: 95°C, 4–14 mg cellulose, and 15–30 min.
2.	Under the optimal condition, the formed CO or CO2, and the sample have the same λ18O value. It is unnecessary to recover oxygen from CO.
3.	The data are accurate and reliable, and the operation method is simple and economic.