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Which water quality test is the most important test for the health of a water ecosystem?

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  • Science -

    Most important?

    Goodness.
    So you decide between:
    Arsenic, lead, mercury, dioxin, pathogenic bacteria, chloroform, pesticides [malathon, DDT, chlorinated compounds], herbicides, silt, salt, dissoved oxygen, cyclic hydrocarbons (benzene derivatives).

    How can you say one is more important than another?

  • Science -

    I mean standard test...

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