GB/T 609-2018 Translated English of Chinese Standard. (GBT 609-2018, GB/T609-2018, GBT609-2018): Chemical Reagent - General Method for the Determination of Total Nitrogenhttps://www.chinesestandard.net, 21. jul. 2018 - 11 sider This Standard specifies a general method for the determination of total amount of trace inorganic nitrogen compounds by Nessler reagent colorimetric method and salicylic acid-hypochlorite colorimetric method. This Standard is applicable to the determination of the total amount of trace inorganic nitrogen compounds (including nitrates, nitrites and ammonium salts) in the chemical reagents. The detection range of Nessler reagent visual colorimetric method and spectrophotometry is 0.05 ~ 0.8 (in terms of N); while the detection range of salicylic acid-hypochlorite visual colorimetric method and spectrophotometry is 0.04 ~ 1 (in terms of N). |
Almindelige termer og sætninger
1.0g of Devarda’s 1.0mL of sodium 100mL colorimetric tube 5mL of sodium 5mL of sulfuric abscissa acid solution 0.5 acid-hypochlorite colorimetric method Add 10mL add 5mL alkaline solution base mass concentration blank test Chemical Reagent colorimetric tube containing coloring solution concentration of nitrogen dark place determine the absorbance dilute to 140mL distill approximately 75mL effective chlorine concentration free base mass Guangdong Heat and distill hydroxide solution 1mol/L hydroxide solution 320g/L hypochlorite stock solution Kelvin nitrogen bottle mass fraction Nessler’s reagent colorimetric Preparation Method product standard provisions of product reagent blank reagent colorimetric method salicylic acid Salicylic acid-hypochlorite colorimetric Sampling and preparing shake sodium hydroxide solution sodium hypochlorite solution sodium hypochlorite stock sodium nitroferricyanide solution sodium thiosulfate standard solution turns stand for 1h standard colorimetric solution standard titration solution standard working curve sulfuric acid solution thiosulfate standard titration Total Nitrogen tube containing 5mL visual colorimetric method volume of sample volumetric flask