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

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Presentation on theme: "Developing rapid tools for characterising biochar carbon stability Steve Kimber, Andy Cross, Steve Morris, Stephen Joseph, Saran Sohi, Lukas Van Zwieten."— Presentation transcript:

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  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 CO 2 on soda lime Sample preparation; labile vs stable carbon, UK Biochar centre

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 biochar project

5 Biochar properties BiocharTotal CTotal N Green waste 350540.05 Green waste 450730.16 Green waste 550790.10 Chicken litter 450501.56 Chicken litter 550431.77 Oil Mallee 450590.25 Oil Mallee 550720.33 Wheat chaff 450572.34 Wheat chaff 550562.00

6 Green waste Poultry litter Wheat chaff Oil mallee

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

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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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