Home / Standards / GB 11894-89 GB 11894-89 Water quality—Determination of total nitrogen—Alkaline potassium persulfate digestion UV spectrophotometric method 水质 总氮的测定 碱性过硫酸钾消解紫外分光光度法 Standard Type GB ICS N/A CCS N/A Status N/A Issue Date N/A Implementation N/A Responsible Dept N/A Drafting Unit N/A