Study on using I- as heavy atom perturber in cyclodextrin-induced room temperature phosphorimetry

A cyclodextrin induced room temperature phosphorimetry (CD-RTP) for determi ne beta-NOA, which using I- as a heavy atom perturber (HAP) and sodium sulf ite as a deoxygenator, was developed. The phosphorescence peak wavelength m axima lambda(ex)/lambda(em) = 287/496521 nm. The analytical curve of beta-N OA gives a linear dynamic range of 2.0 x 10(-7)-6.0 x 10(-6) mol/l and a de tection limit of 4 x 10(-8) mol/l. The relative standard deviation (RSD; n = 7) was 3.2% for the 4.0 x 10(-6) mol/l beta-NOA in spiked apple samples. The influence of I- concentration on RTP lifetime of beta-NOA was studied i n detail, the static Stern-Volmer equation for phosphorescence was derived and the luminescence kinetic parameters were calculated, It is found that t he relation between I- concentration (x) and RTP lifetime (tau) can be expr essed as tau = 1.047 e(-0.354x) and the rate constants of phosphorescence e mission k(p) and non-radiation process k(i) from T-1 --> S-0 were 0.9551 s( -1) and 0.4276 s(-1)l(-1)mol, respectively. (C) 2000 Elsevier Science B.V. All rights reserved.