A convenient method of analysis of humic acid in fresh water.
D005618:Fresh Water / Q000032:analysis; D006812:Humic Substances / Q000032:analysis*; D008722:Methods; D012987:Soil / Q000032:analysis; D013053:Spectrophotometry; D014867:Water / Q000032:analysis*
D006812:Humic Substances; D012987:Soil; D014867:Water