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2) In Libes chapters 22 and 23 as well as in the lecture slides many classesof organic compounds and organic functional groups are identified as beingcomponents of marine organic material. In theory any or all of these can beincorporated into humic materials becoming part of their structure or functionality.In the attached PowerPoint diagrams circle one example of each of the followingstructural entities: aromatic carboxylic acid group, aliphatic carboxylic acid group,aromatic ring, phenolic group, amine group, alcoholic group (aliphatic), branchedand unsaturated hydrocarbon chain, polysaccharide, fatty acid, amino acid, metalcomplexation site, hydrogen bond, quinone.

The functional groups can be circled using the circles provided on the right side ofeach of the PowerPoint slides. Just open the file in PowerPoint and position yourcursor over the border of a circle. Click and hold the left mouse button and thecircle will go into edit mode. With the mouse button still depressed you can movethe circle to the desired location on the PowerPoint slide to highlight a structuralfeature. While in the edit mode the circles can be stretched to make ovals andresized to accurately encircle the structural feature of interest. Identify thefeatures with a key based on slide number and circle color.

Problem Set #3, April 13, 2004

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Morel & Hering,1993

Branched and unsaturated hydrocarbon chain

Alcoholic group

Fatty acid group

Aromatic ring

3Kleinhempel reprinted from Albrecht Thaer Archiv (1970)

Aromatic carboxylic acid group

Phenolic group

Quinone

Hydrogen bondMetal complexation

Polysaccharide

Amino Acid

Amine Group

Aromatic Ring

Aliphatic carboxylic acid

Alcoholic group

carboxylic acid group

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