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Using Pb2+ as ion perturber, phenosafranine (PF) and fluorescein isothiocyanate (FITC) could emit strong and stable room temperature phosphorescence (RTP) signal on the filter paper, respectively. When they were mixed, the phenomenon that the RTP signal of PF and FITC enhanced significantly was found. And 1.12 ag DNA spot−1 (sample volume was 0.40 μL, corresponding concentration was 2.8 × 10–15 g mL...
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