The XRF analysis raw rice husk showed the content of silica is around 89 wt%. On the other hand, the contents of rice husk are around hemicellulose 24.3%, cellulose 34.4%, lignin 19.2%, ash 18.85%, and the else substance 3.25%.
Normally, Slica content are determined by assh content. An it is not possible that content (89) for rice husk
Agreed with Mr. Mustafa. Silica is count as inorganic matter (extracted from ash) and hemicellulose+lignin+cellulose are organic matter. So the mass balance of silica must be refer to the total inorganic basis and not overall rice husk basis.
Thank you for your answering Dear Mr Mustafa Çiçekler and Mr Mohd Hazwan Hussin,
I read your Idea but I send The Rice Husk to test by XRF analysis, it shows me this result that I attached here, is it possible, please see it?
Is this analysis meant for RHA or RH? I have looked your data and it seems that your RH is rich with silica. But remember, the analysis of XRF is solely to analyze how much inorganic matter in your sample. It cannot be used to estimate the composition of organic matter (hemicellulose/lignin/cellulose --> you can use standard TAPPI method for this analysis). Like i have mentioned earlier, this result is refering to the total inorganic basis and not overall RH basis. You can back-calculate this value:
Total silica in RH = 89/100 x 18.85 = 16.78 %
Dear Zeynab
your calculations for organic content of rice husk are right and in agree with other literature . but you seemed to be confused with the result of silica content obtained from XRF which is not a direct calculation of silica content in both organic and in organic matter. there is a simple test to determine it by Tappi standards (T 245 cm-07) for silica in case of rice hulls).
Dear Zeynab,
I agree with Mona and Mohd. Because it is impossible that content (89%). I alweays use TAPPI method. I suggest you this method. Also you can compare them to each method
I think that have any mistake in these numbers. In a paper that evaluated the rice husk material in Brazil some these number are many different. See in http://www.scielo.br/scielo.php?script=sci_issues&pid=0104-7760&lng=en&nrm=iso access the year 2011, vol 17, number 2.
Dear Zeynab,
I hope this figure might help you to understand better about the components of your rice husk.
Best regards, and success in your research!
Thank you so much of all for your interesting answers, I am glad to be in researchgate group to have smart friends.
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