Abstract
In this paper, the non-protected room temperature phosphorescence (NP-RTP) properties of α-naphthyloxyacetic (α-NOA) and β-naphthyloxyacetic acid (β-NOA) and effects of organic solvents have been studied to clarify the effects of position of substituent on the luminescence. Both α-NOA and β-NOA aqueous solutions can emit strong and stable RTP signal in the absence of a protecting medium by addition of KI or TlNO 3 as heavy atom perturber (HAP) and Na 2SO 3 as deoxygenator. The fluid RTP system is completely transparent and stable. A good linearity between the RTP intensity and the concentration was obtained with detection limits of 1.0×10 −8 and 1.2×10 −8 mol/l, respectively, for α-NOA and β-NOA. The kind and amount of organic solvent added to the luminescent system not only affect the RTP intensity and the pre-irradiation time required to attain a stable RTP signal, but also the selection of HAP. Under the same conditions, the RTP intensity of the system using TlNO 3 as HAP is much stronger than that of the system using KI as HAP, but the detection limits of both systems for analytical determination are comparable. The RTP intensity of β-NOA is lower than that of α-NOA, but the influence of organic solvent on its RTP emission is also less. Determination of α-NOA in spiked pond water using standard additions method was performed, the recoveries are 97–102%.
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