I have not done the analysis but planning to. I want to estimate CaCO3 in algal biomass.
What do you exactly mean by "quantify"? There are so many methods of quantification of molecules. Be specific Also, by XRD, do you mean x-ray diffraction? Questions must be posed well and clearly in order for others to answer them.
Read the following articles; useful on the measurement of Calcium Carbonate. XRD is also discussed.
Methods for Calcium Carbonate Content Measurement of Biocemented Soils
https://ascelibrary.org/doi/abs/10.1061/%28ASCE%29MT.1943-5533.0002064
Characterization of Calcium Carbonate Polymorphs with Ca K Edge X-ray Absorption Fine Structure Spectroscopy
https://pdfs.semanticscholar.org/4fd8/22370724fc2069fe67e6cd6c7f68814d5867.pdf
Differentiating calcium carbonate polymorphs by surface analysis techniques—an XPS and TOF‐SIMS study
https://onlinelibrary.wiley.com/doi/pdf/10.1002/sia.2904
Best wishes
Hello, I agree, XRD using Rietveld refinements will tell you the percentages of all crystals phases present in the powder samples analysed by the XRD. e.g. 67% of Calcite, 22% of aragonite, 7% of feldspar, etc. However, it can only detect the crystalline structures. You could use FTIR/Raman to detect some of the other organic compounds in the samples and perhaps correlate the results with the XRD percentages.
You can also see this article:
http://www.mdpi.com/2075-163X/7/9/164/pdf
"Mineral Quantification with Simultaneous Refinement of Ca-Mg Carbonates Non-Stoichiometry by X-ray Diffraction, Rietveld Method"
It is a little specific, but it is fast and precise method.
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