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Change of fluorescence in ambers according to artificial aging
Analytical Science and Technology / Analytical Science and Technology, (P)1225-0163; (E)2288-8985
2012, v.25 no.3, pp.197-206
https://doi.org/10.5806/AST.2012.25.3.197
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(2012). Change of fluorescence in ambers according to artificial aging. Analytical Science and Technology, 25(3), 197-206, https://doi.org/10.5806/AST.2012.25.3.197
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Abstract
Ambers are composed of polymer molecules which contain aromatic moieties such as benzene,naphthalene, phenanthrene and anthracene. They emit fluorescence when irradiated with ultraviolet light, which was used for confirming an amber. The fluorescence of amber, however, tends to decrease as the surface of amber is weathered with light, heat, oxygen for a long time. In this study, the reliability of confirming amber with its fluorescence by measuring the changes of fluorescence after artificial aging. Aging factors were UV light (λ=340 nm), oxygen with heat (100%, 90 oC) and heat (90 oC) and aging time was for 5, 15, 30 and 60 days, respectively. In the excitation and emission spectra of amber, the intensity decreased and the maximal wavelength was shifted to longer wavelength with artificial aging time. Especially, there was a drastic decrease in the intensity of spectra to 1.7% of initial value after 60 days aging under oxygen with heat. Only in Colombian amber there showed an increase of fluorescence intensity for a certain aging time, which could be explained by the production of aromatic ring in the presence of light and heat. Conclusively, the fluorescence can be lessened by the natural weathering with light, heat and oxygen and it is not accurate to recognize amber just with UV irradiation method.
- keywords
- amber, fluorescence, artificial aging, heat, oxygen, light
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