1Chemical composition of natural waters 2: suspended particlesI. types of suspended particulate matter A. inorganic 1. mineral clays (alumino-silcates) 2. Al, Fe, and Mn oxides 3. may dominate suspended particle loads of some rivers, estuaries, and bottom waters B. biogenic 1. living and dead organisms(bacteria, microalgae, zooplankton, dead remains, fecal pellets) 2. biologically produced mineral phases(CaCO3, SiO2·nH2O) 3. biogenic particles are formed in surface waters and remineralizedat depth 4. POC (particulate organic carbon): 5 μg- 5 mgL-1
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