While searching for this i had come to know that "The determination limit for carbon, nitrogen and sulfur with sample amounts of 2 to 3 mg was proven to be at about 0,05 w-% (500 ppm) with an uncertainty below 0,02 w-%". so the U(X)= +-0.02 %. Is it correct or the uncertainity is different for C, H, N and S.
Yes, variation is bound to come differently for different nutrients, more for nutrient like N, C, H and least for S. Homogeneity of solid sample is very important and the conditions under which solid samples are stored..CV of results obtained up to 5-10% is permissible..
If you are asking whether "an uncertainty below 0,02 w-%"" is equivalent to U(X)= +-0.02 % then the answer is Yes, it is correct, but trivial, all you are doing is substituting a symbol for words.
If you are asking whether the uncertainties given in what you quote are accurate, then that depends and you should determine the uncertainties experimentally or draw up an uncertainty budget.
It is not likely that the limits of quantitation (determination) will be the same for different analytes.
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