EJ/T 272.2-1985 Analytical method for chromium in uranium mining and metallurgy wastewater was changed to GB/T 7476-1987 Water quality--Determination of calcium--EDTA titrimetric method.
EJ/T 272.2-1985 Analytical method for chromium in uranium mining and metallurgy wastewater was changed to GB/T 7477-1987 Water quality--Determination of the sum of calcium and magnesium--EDTA titrimetric method.
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