Procedural ordinance on development and contents of section 'Safe operation of production facilities' of process regulations. RD 09-251-98 (approved by the Resolution No. 77 dated 18.12.1998 of Gosgortechnadzor of Russia) (rev. as of 21.11.2002)
Mass concentration of nitrogen oxide and nitrogen dioxide in atmosphere air samples. The procedure of measurement by photometric method using sulfanilic acid and I-naphthylamine