Although the EDS indicates that there may be significant amounts of K and Ca in the biochars, K and Ca are not measurable at the excitation wavelength used in the pXRF measurements and so were not quantified in this work.
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Although the EDS indicates that there may be significant amounts of K and Ca in the biochars, K and Ca are not measurable at the excitation wavelength used in the pXRF measurements and so were not quantified in this work.