| http://www.w3.org/ns/prov#value | - 3,6-trisulphonate as a fluorescent substance and phenol red as a chromogenic substance.Preferably, fluorescent substance (donor) and chromogenic substance (acceptor) are covalently attached to each other.The subsequent table gives examples of combinations of a fluorescent and a chromogenic substance for determination of different chemical parameters, all fluorescent substances satisfying the deman
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