The normal composition of the effluent samples at Abbott Laboratories is within the maximum tolerated impurity levels as listed in the Illinois State Standards (1968). These tolerances are partially summarized in Table I and do not interfere in the assay. Wiersma (1970) employed 2,3-diaminonaphthalene as a fluorometric reagent for nitrite ion and in addition performed Table I. Illinois Effluent Standards Constituent" Standard Ammonia nitrogen 2.5 ppm Arsenic 1.0 ppm BOD 40 mg/1.
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