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By M.A. Rashid

A few ninety years in the past, the 1st info at the prevalence of dissolved natural subject in sea water used to be released. for fifty years after that reve lation, little growth used to be made in settling on those dissolved "yellow substances." within the Nineteen Fifties and Sixties, a couple of chemical oceanographers pointed out a few particular dissolved natural compounds, yet few of those pioneers totally liked their value when it comes to organic inter activities, steel chelation, or interactions with sedimentary fabric. while Mohammed Rashid begun his paintings on marine humic compounds within the mid-1960s, he used to be certainly one of basically 5 scientists who had particularly designed their stories towards figuring out the character of those complicated fabrics. Over the subsequent decade, Dr. Rashid directed his study towards characterization of humic and fulvic compounds within the marine environ ment, the impression of humic elements at the progress of marine phy toplankton, the position of natural subject in complexing metals in sea water and marine sediments, the interplay among humic elements and clay minerals in marine environments, and the impact of natural topic at the geotechnical homes of marine sediments. as though the various papers made from those clinical investigations weren't adequate, Dr.

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Geochemistry of Marine Humic Compounds

A few ninety years in the past, the 1st info at the prevalence of dissolved natural topic in sea water was once released. for fifty years after that reve lation, little development used to be made in determining those dissolved "yellow components. " within the Nineteen Fifties and Nineteen Sixties, a couple of chemical oceanographers pointed out a few particular dissolved natural compounds, yet few of those pioneers absolutely liked their importance by way of organic inter activities, steel chelation, or interactions with sedimentary fabric.

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A significant proportion of the primary producers and the products of their photosynthetic activity become part of the food chain for ocean-dwelling organisms. Zooplankton are the most important grazers of phytoplankton. Primary producers are consumed by herbivorous organisms, which are eaten by carnivores (Alexander, 1971). The rates of consumption of different species vary greatly. 22 1. Origin and Distribution of Organic Compounds in the Marine Environment Zooplankton can consume up to half their own weight in algae daily.

Analysis Kinney et al. (1971) Northeast Pacific 250 to 400 m 30-110 Central Pacific (Hawaii) o to 100 m 1000 to 4000 m ! Eastern Tropical Pacific (Peru current) Ot020m 20 to 100 m 200 to 3000 m Gulf of Aden 100 m o to Arctic Ocean (Amerasian Basin) o to 20 m 250-1250 40-500 <15 80-180 7-13 Coastal distribution (mg I-I) Atlantic N. American Coast Charleston Harbor Hatteras Inlet Manheim et al. R. R. R. 57 Biggs and FIemer (1972) North Pacific (Aleutian Ridge) o to 50 m 100 to 1500 m 26 1. 5 X 108 tons) C.

These compounds make up the majority of the colloidal organic carbon in sea water and were originally called gelbstoff(yellow material) because of the yellow color that developed in water in their presence. The complex nature of gelbstoff was identified by Kalle (1966), who suggested that this was not a single compound but a complex polymeric material formed by the condensation of polyphenols with carbohydrates and proteins. The detailed chemical composition is examined in Chapter 3. 5. Some representative values for the concentration of particulate organic carbon in the oceans (values reported since 1965) (from Parsons, 1975, with permission from Chemical Oceanography, vol.

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