Home / Standards / GB/T 7493-1987 GB/T 7493-1987 Active Water quality--Determination of nitrogen(nitrite)--Spectrophotometric method 水质 亚硝酸盐氮的测定 分光光度法 Standard Type GBT ICS 13.060 CCS Z16 Status 现行 Issue Date 1987-03-06 Implementation 1987-08-01 Responsible Dept 生态环境部 Drafting Unit N/A