2014GOST 33045-2014 Water. Methods for determination of nitrogen-containing matters
1982GOST 4192-1982 Drinking water. Methods for determination of mineral nitrogen-containing matters
0000 GOST 4192-1948
GOST 4192-1982 Drinking water. Methods for determination of mineral nitrogen-containing matters was changed to GOST 33045-2014 Water. Methods for determination of nitrogen-containing matters.