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See Chinese contents: HJ 636-2012 HJ 636-2012: Water quality. Determination of total nitrogen. Alkaline potassium persulfate digestion UV spectrophotometric method
This Standard specifies water quality - determination of total nitrogen - alkaline potassium persulfate digestion UV spectrophotometric method. This Standard is applicable to the determination of total nitrogen in surface water, groundwater, industrial wastewater and domestic sewage.
