Biological organic phases-water

Because 1-octanol is a good surrogate phase for lipids in biological organisms, the octanol-water partition coefficient, a ratio of concentrations in 1-octanol and water, represents how a chemical would thermodynamically distribute between the lipids of biological organisms and water. It further represents the lipophilicity and the hydrophobicity of the chemical substance. It usually is referred to as Kow or P, or in its 10-based logarithmic form as log I, w or log P, and is unitless. For more detail see Chapter 5. 

System 17. bottom sediments (X) sediment organisms and their biological reactions (XI) waters (II) aquatic plants and their biological reactions (XII) atmosphere air (17a, 30, 31). The chemical interactions between aquatic and gaseous phases play an extremely important role in the composition of both water and air. These interactions determine the development of aquatic ecosystems. The example of oxygen content in the water is the most characteristic one. 

It should be noted that concentration of phospholipids and AmB in methanol is limited by the solubility of these two substances in the organic phase. A high final concentration of methanol in the mixture with water is also necessary to form submicronic particles. Thus, the suspensions had to be concentrated by rotary evaporation before testing in biological systems. 

A large, sealed fish tank - consisting of 20 m of water, 10 m of air, 1 m of sediment, and 0.2 m of fish and other biological organisms - has 100 g of benzene accidentally spilled into it. What will be the eventual (equilibrium) concentrations and mass in each phase The fraction of organic carbon in the sediments has been determined to be 0.01. The density of the sediments has been determined to be 2g/cm. The octanol-water partitioning coefficient for benzene is 138. 

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