Chemistry of natural organic matter — The next step: Commentary on a humic substances debate

Engineering & Materials Science

• Humic Substances 100%
• Biological materials 76%
• Soils 7%
• Sediments 5%
• Terminology 5%
• Earth (planet) 4%

Earth & Environmental Sciences

• humic substance 64%
• organic matter 38%
• biochemical process 6%
• nomenclature 5%
• aquatic system 5%
• aquatic environment 4%
• field study 4%
• soil 4%
• in situ 2%
• laboratory 2%
• sediment 2%

Chemical Compounds

• Chemistry 33%
• Environment 8%
• Soil 8%
• Environmental Process 7%
• Black 4%
• Surface 1%