This is a confusion of many, while calculating the %O from CHNS analysis, whether it is necessary to subtract %Ash content? in some papers they do and in some papers they don't. which is the correct procedure??
%O = 100- %( C+ H+ N) OR %O = 100 - % [C+ H+ N+ ASH]
Dear U. Nath,
The value of O (in wt%) is typically determined by difference, irrespective of the reported basis (as received, dry ash free or dry basis). Therefore, the approach is to sum up all the required elements or fuel properties depending on the reported basis and subtract the value from 100%.
Kindly note that if the ash (and moisture) content is included as you stated in your question then, the reported basis is "as received". For further clarification, kindly refer to the text; Biomass Gasification and Pyrolysis by Prabir Basu (CRC Press 2010). Hope this helps.
Regards,
BBN
Bemgba B. Nyakuma Thank you, this was quite helpful. could you please provide me some pdfs regarding this.
Dear U Nath,
I am afraid, I do not have access to any PDF copies of the book, as my university has copies which I consulted in the past. However, here is a link to the book on google books >> https://books.google.com.my/books?id=BYM2DwAAQBAJ&printsec=frontcover&dq=biomass+gasification+P+Basu&hl=en&sa=X&ved=0ahUKEwje483UsbDeAhVKuVMKHRDDCPsQ6AEIKDAA#v=onepage&q=biomass%20gasification%20P%20Basu&f=false. It may help.
Best regards,
BBN
Dear all,
Could you advise how to calculate the oxygen from inorganic and from organic based on CHONS elemental analysis?
Thank you
That is a European way of calculating oxygen, (100- C- H- N -S - ash(dry basis)).
Through EA 1108 CHNS-O
Ash must be calculated on the dry basis.
The solid sample is weighed in using a silver capsule. 2 to 5 mg of material are required. After closing and folding the capsule it is placed in the auto sampler.
The silver capsule is released and falls down into an oven held at 1070 °C where it is degraded in pure helium atmosphere. The volatile products react at a nickel carbon phase where oxygen is set free in the form of carbon monoxide.
In addition to CO the only important product gas observed is N2. These products are sparated by gas chromatography and detected and quantified at a TCD (thermal conductivity detector).
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