Home / Standards / GB/T 4920-1985 GB/T 4920-1985 Active Determination of sulphuric acidmist in tail gas in sulphuric acid concentration process--Barium chromate colorimetric method 硫酸浓缩尾气硫酸雾的测定 铬酸钡比色法 Standard Type GBT ICS 13.040.50 CCS Z25 Status 现行 Issue Date 1985-01-18 Implementation 1985-08-01 Responsible Dept 生态环境部 Drafting Unit N/A