FIELD: chemical engineering; environmental protection. SUBSTANCE: method involves using chlorella microalga as analytic indicator preirradiated with visible light of 30-50 W/m2 during 50- 70 s. After 8-10 s dark period, light of 5-8 W/m2 is switched on to record delayed fluorescence induction of the alga and detect its slow phase, which intensity shows cyan-ion presence in the environment. EFFECT: enhanced sensitivity in detecting cyan ion presence. 3 dwg
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