1 3)In Emerson & Hedges chapter 8 and Libes chapters 22 and 23 (provided on the class website) as well as in the lecture slides many classes of organic.

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1 3)In Emerson & Hedges chapter 8 and Libes chapters 22 and 23 (provided on the class website) as well as in the lecture slides many classes of organic compounds and organic functional groups are identified as being components of marine organic material. In theory any or all of these can be incorporated into humic material becoming part of their structure or functionality. In the attached PowerPoint diagrams circle one example of each of the following structural entities: Figure 1 - aromatic ring, aliphatic carboxylic acid group, methyl group, alcoholic group (aliphatic), saturated hydrocarbon chain, unsaturated hydrocarbon chain, fatty acid, carbonyl group, peroxide group, glycerine backbone. Figure 2 - aromatic carboxylic acid group, aliphatic carboxylic acid group, phenolic group, amine group, amino acid, metal complex, hydrogen bond, quinone, polysaccharide, alumino-silicate clay, ether, ester, aldehyde, ketone, amide. The functional groups can be circled using the circles provided on the right side of each of the PowerPoint slides. Just open the file in PowerPoint and position your cursor over the border of a circle. Click and hold the left mouse button and the circle will go into edit mode. With the mouse button still depressed you can move the circle to the desired location on the PowerPoint slide to highlight a structural feature. While in the edit mode the circles can be stretched to make ovals and resized to accurately encircle the structural feature of interest. Identify the features with a key for circle color (provided). Problem Set #4, April 15, 2011

2 Morel & Hering, 1993 Figure 1.

3 Key for Figure 1 peroxide group aromatic ring aliphatic carboxylic acid group methyl group alcoholic group (aliphatic) saturated hydrocarbon chain unsaturated hydrocarbon chain fatty acid carbonyl group glycerine backbone

4 Figure 2. Kleinhempel reprinted from Albrecht Thaer Archiv (1970)

5 amide Key for Figure 2 aromatic carboxylic acid group aliphatic carboxylic acid group phenolic group amine group amino acid metal complex hydrogen bond quinone polysaccharide alumino-silicate clay ether ester aldehyde ketone