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    Persistent Organic Pollutanants: Bioaccumulation Measurements

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    Question 11
    The following molecules are known Persistent Organic Pollutants, which are globally monitored & regulated. Their log(Kow) values, as reported by the United Nations Environmental Protection Agency (UNEP) in 1995, are given here. Where ranges are given, this indicates different values obtained under different environmental conditions (salt concentrations, temperatures, and other external variables).

    Rank the tendency for bioaccumulation from highest to lowest, by comparing their log(Kow) values for the 4 POPs below. Compare the "worst case scenario", i.e., the strongest tendency to bioaccumulation for each toxin.

    For each pollutant say whether it is lowest , intermediate or highest
    Aldrin 5.17-7.4
    Chlorodane 6.0
    DDT 4.89-6.81
    DioxinH7CDD 8.0
    Endrin 3.2-5.3
    Heptachlor 4.4-5.5

    Aldrin ?
    DDT ?
    Dieldrin ?
    Dioxin H7CDD

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    Solution Preview

    The log Kow is simply the ratio of pollutants solubility in octanol to that in water. The higher the value, the more the tendency to be in the octanol phase. Also, it should be noted that octanol is used to represent organic matter, and depending upon the system, this organic matter ...

    Solution Summary

    The solution examines measurements of persistent organic pollutants reported to the United Nations Environmental Protection agency. The ranges of these values and the different environmental conditions are determined.