DIN 38406-5:1983-10 German standard methods for the examination of water, waste water and sludge; cations (group E); determination of ammonia-nitrogen (E 5)
1983DIN 38406-5:1983-10 German standard methods for the examination of water, waste water and sludge; cations (group E); determination of ammonia-nitrogen (E 5)
1983DIN 38406-5:1983 German standard methods for the examination of water, waste water and sludge; cations (group E); determination of ammonia-nitrogen (E 5)