NATIONAL STANDARD OF THE PEOPLE'S REPUBLIC OF CHINA
HJ 667-2013
水質 總氮的測定 連續流動-鹽酸萘乙二胺分光光度法 Water quality. Determination of total nitrogen by continuous flow analysis(CFA) and N-(1-naphthyl)ethylene diamine dihydrochloride spectrophotometry
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The Standardization Administration of the People's Republic of China