Home / Standards / GB/T 14668 GB/T 14668 Abolished Air quality--Determination of ammonia--Nessler’s reagent colorimetric method 空气质量 氨的测定 纳氏试剂比色法 Standard Type GBT ICS 13.040.20 CCS Z15 Status 废止 Issue Date 1993-09-18 Implementation 1994-05-01 Responsible Dept 生态环境部 Drafting Unit 生态环境部