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Determination of calcium, magnesium and sulphur in organic fertilizer
YB/T 4825-2020
SN/T 3005-2011
Test method for instrumental determination of carbon,hydrogen,nitrogen and sulfur in organic chemicals
T/HNNMIA 87-2023
\u0413\u041e\u0421\u0422 26374-84
Combustible natural gases. Method for determination of total and organic sulphur content