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See Chinese contents: GB/T 11893-1989 GB/T 11893-1989: Water quality. Determination of total phosphorus. Ammonium molybdate spectrophotometric method
This standard specifies the method of using potassium persulfate (or nitric acidperchloric acid) as the oxidant to digest the unfiltered water sample and using ammonium molybdate to determine the total phosphorus with spectrophotometry.
