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Developing rapid tools for characterising biochar carbon stability

Developing rapid tools for characterising biochar carbon stability. Steve Kimber, Andy Cross, Steve Morris, Stephen Joseph, Saran Sohi, Lukas Van Zwieten. Benefits of biochar ?. Long term carbon sequestration Biochar carbon essentially “inert”

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Developing rapid tools for characterising biochar carbon stability

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  1. Developing rapid tools for characterising biochar carbon stability Steve Kimber, Andy Cross, Steve Morris, Stephen Joseph, Saran Sohi, Lukas Van Zwieten

  2. Benefits of biochar ? • Long term carbon sequestration • Biochar carbon essentially “inert” • Possibility of “priming” for loss of native soil carbon • Reduction in or negation of benefit • Agronomic benefit • Changes in soil chemistry and biology

  3. Sample preparation; labile vs stable carbon, UK Biochar centre • Dry and grind biochar (105°C, 0.5mm) • Incubate • Sterile quartz sand • Microbial inoculant and micronutrients • 65% water holding capacity • 30°C for 14 days • Trap and measure CO2 on soda lime

  4. Biochars used in this study • Green waste biochar # • 350°C • 450°C • 550°C • Chicken manure* • 450°C • 550°C • Oil mallee * • 450°C • 550°C • Wheat chaff * • 450°C • 550°C # Biochars courtesy of Pacific Pyrolysis * Biochars courtesy of DAFF National biocharproject

  5. Biochar properties

  6. Poultry litter Green waste Oil mallee Wheat chaff

  7. Labile carbon content of biochars

  8. Our capabilities and approach • EGA / MS • Thermal desorption / cryofocussing / GC-MS • Pyrolysis / cryofocussing / GC-MS

  9. Pyrolyser – GC-MS

  10. Frontier Laboratories’ 2020iD multi-function pyrolyzer

  11. Sample preparation; Py-GC-MS • Mix • Sub-sample • Freeze dry • Grind • Sub-sample • 3mg sample of biochar analysed

  12. EGA

  13. EGA

  14. EGA

  15. EGA

  16. Green waste; Thermal desorption 350 450 550

  17. Chicken litter; Thermal desorption 450 550

  18. Oil Mallee; Thermal desorption 450 550

  19. Wheat Chaff; Thermal desorption 450 550

  20. Green waste; Pyrolysis

  21. Chicken litter; Pyrolysis

  22. Oil mallee; Pyrolysis

  23. Wheat chaff; Pyrolysis

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