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- W2078304780 abstract "The equilibrium activities of 39 dissolved species in the system C-N-S-H2O are computed as a function of pe− and pH at 25°C. For pe-pH conditions encountered in natural waters the predominant dissolved species are CH4, H2CO3, HCO3−, CO32−, NH4OH, NH4+, N2, NO3−, H2S, HS− and SO42−. Organic compounds of higher molecular weight, dissolved or particulate, are thermodynamically unstable in most natural environments. The distribution of dissolved species for the decomposition reactions of carbohydrate (CH2O) and alanine (C3H7O2N) in sea water are computed, assuming equilibrium among the decomposition products. The decomposition, in a closed system, of 0.1 gram-atom of organic carbon per liter of solution produces: a. (CH2O)—mCH4 ~ 10−2, mHCO3− ~ 10−1, mHS− ~ 10−2.5, mNH4+ ~ 10−3, pH ~ 6.5; b. (C3H7O2N)—mCH4 ~ 10−2, mHCO3− ~ 10−1, mHS− ~ 10−1.5, mHN4+ ~ 10−1.5, pH ~ 7.3. In the course of these reactions, the oxidation potential changes by only 50–60 mV after consumption of the initial oxygen. A mathematical expression for the homogeneous pe buffer capacity, βE, is derived. Data from five reducing marine environments show that the predominant dissolved species tend to approach equilibrium, with the exception that the concentration of dissolved methane in certain environments is considerably higher than the predicted equilibrium concentration. Values of βE range from 10−3 to 1.2 for the environments studied." @default.
- W2078304780 created "2016-06-24" @default.
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- W2078304780 date "1970-07-01" @default.
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- W2078304780 title "Equilibrium distribution of small organic molecules in natural waters" @default.
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- W2078304780 doi "https://doi.org/10.1016/0016-7037(70)90029-3" @default.
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