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A strong and stable room temperature phosphorescence(RTP) signal of fluoren(Flu), acenaphthene(Ace) aqueous solution can be induced only by using Na 2SO 3 as oxygen scavenger and KI as heavy atom perturber. The maximum phosphorescence intensity wavelengths are λ ex / λ em =285/467, 286/493, 520 nm. The RTP intensity is very sensitive to the kind and amount of organic solvent added to the system. For a Flu(or Ace)/KI/Na 2SO 3 aqueous solution system containing 1 0% acetonitrile, the RTP intensity is linear to Flu(or Ace) concentration in the range of 8 0×10 -7 ~8 0×10 -6 mol/L and 8 0×10 -6 ~4 0×10 -5 mol/L or 8 0×10 -7 ~2 8×10 -6 mol/L and 2 8×10 -6 ~4 0×10 -5 mol/L. The calculated detection limit by methodology of IUPAC based on three times the standard deviation of background is 8 6×10 -8 , 9 0×10 -8 mol/L respectively. The relative standard deviation( n =7) is 2 4% or 3 5% for the system containing 1 2×10 -5 mol/L of Flu or Ace. The present work shows again that a protective medium is not necessary condition for the fluid RTP emission.
A strong and stable room temperature phosphorescence (RTP) signal of fluoren (Flu), acenaphthene (Ace) aqueous solution can be induced only by using Na 2SO 3 as oxygen scavenger and KI as heavy atom perturber. The maximum phosphorescence intensity of are λ ex / λ em = 285/467, 286/493, 520 nm. The RTP intensity is very sensitive to the kind and amount of organic solvent added to the system. For a Flu (or Ace) / KI / Na 2 SO 3 aqueous solution system containing 1 0% acetonitrile, the RTP intensity is linear to Flu (or Ace) concentration in the range of 8 × 10 -7 to 8 × 10 -6 mol / L and 8 × 10 -6 to 4 × 10 10 -5 mol / L or 8 0 × 10 -7 ~ 2 8 × 10 -6 mol / L and 2 8 × 10 -6 ~ 4 0 × 10 -5 mol / L The calculated detection limit by methodology of IUPAC based on The relative standard deviation (n = 7) is 2 4% or 3 5% for the system contactor ining 1 2 × 10 -5 mol / L of Flu or Ace. The present work shows again that a protective medium is not necessary condition for the fluid RTP emission.