DIN 38405-9:2011-09 German standard methods for examination of water, waste water and sludge - Anions (group D) - Part 9: Spectrometric determination of nitrate (D 9)
2011DIN 38405-9:2011-09 German standard methods for examination of water, waste water and sludge - Anions (group D) - Part 9: Spectrometric determination of nitrate (D 9)
2011DIN 38405-9:2011 German standard methods for examination of water, waste water and sludge - Anions (group D) - Part 9: Spectrometric determination of nitrate (D 9)
1979DIN 38405-9:1979 German standard methods for examination of water, waste water and sludge; anions (group D), determination of nitrate ion (D9)