I did CHNS analysis of my biochar samples ans i have to g=find out these ratio. In some papers i saw they directly calculate it by the %C, %H, %N obtained by CHNS. but in some papers they minus the %ash content from %C content. and for some papers they did it with some entirely different way which i am not able to figure out. Kindly help me to figure out the right way to calculate these ratios.
Do not adjust for the mineral content unless you know that it contains no sulfate. Supply the mineral content.
Amita, Can you tel me what is the answer? I am also searching for the answer.
Cheers
Zakaria
Dear Sir Zakaria Solaiman
Sorry for late answer. That's right ash content should not be avoided and molar ratios should be calculated like say if value of carbon content is 67% then its should be divided with atomic weight of carbon which is 12 which should be 5.58. In similar way for N, H and O all the % calculated values should be divided with their respective atomic weight and then with theses calculated values ratios should be calculated. You can also refer the link below:
https://www.researchgate.net/post/how_to_calculate_molar_ratios_H_C_and_O_C_in_biochar
Regards
Amita
Hello Amita Shakya. I was just searching for how to calcultae these ratios and found your explanation. Very useful, thanks.
Hi Amita Shakya
the CHNS analyser determines the total carbon content. In order to work out the organic portion we need to know the carbonate content in biochar. The inorganic carbon content is generally negligible for low ash content biochars (Enders et al., 2012; https://www.researchgate.net/publication/335588078_PALM_KERNEL_SHELL_BIOCHAR_PRODUCTION_CHARACTERISTICS_AND_CARBON_SEQUESTRATION_POTENTIAL/ ).
Hope this helps?
All the best, Rob.
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