Standard No.:	GB 4921-1985
English Name:	Waste gas from manufacturing process; Determination of chemical oxygen demand and nitrogen oxide; Potassium dichromate oxidation and naphthylethylene diamine colorimetric method
Chinese Name:	工业废气 耗氧值和氧化氮的测定 重铬酸钾氧化、萘乙二胺比色法
Chinese Classification:	Z23    Analysis methods for industrial wastewater and pollutants
Professional Classification:	GB    National Standard
Issued by:	State Environmental Protection Administration
Issued on:	1985-01-18
Implemented on:	1985-8-1
Status:	valid
Language:	English
File Format:	PDF
Word Count:	1500 words
Price(USD):	45.0
Delivery:	via email in 1~3 business day

本标准适用于经过处理或初步处理后的雷汞废气中的耗氧值和氧化氮的测定。适用范围耗氧值2～200mg/L，氧化氮1～100mg/m3。本标准中耗氧值系指在特定条件下，废气中能使重铬酸钾还原的某些有机气体和还原性气体的含量，以氧的消耗值计。本标准中氧化氮系指一氧化氮、二氧化氮等氮氧化合物的总和，以二氧化氮计。