摘要
为了有效鉴别区分金黄色海水珍珠(简称金珠)和改色金珠,通过拉曼光谱和紫外可见吸收光谱对二者进行了检测分析。结果表明,拉曼光谱中,金珠的谱线稳定杂峰少,荧光背景弱,改色金珠的谱线杂峰多,荧光背景很强。0～1000 cm-1拉曼位移内金珠的光潜基线强度在1000以下,改色金珠的光谱基线强度在2000以上;金珠在拉曼位移275 cm-1处出现明显的拉曼特征峰,改色金珠275 cm-1处的拉曼特征峰基本被荧光谱线覆盖而变弱或消失;紫外可见吸收光谱中,金珠在200nm～400 nm的近紫外区有284 nm,357 nm两个明显的紫外吸收峰。由于颜色处理过程中对珍珠表面破坏程度的不同,导致改色金珠在近紫外区无特征吸收,吸收峰发生红移(408 nm)或消失。
In order to identify and distinguish golden saltwater pearls and color-treated golden pearls, Raman spectrum and UV-visible absorption spectrum were used for testing and analyzing. The results show that in Raman spectrum, compared with color-treated one which has more miscellaneous peaks and higher fluorescence background, peaks are found more stable and less miscellaneous in golden saltwater pearls with a much lower fluorescence background. Between 0- 1000 cm^-1 , the base lines of golden saltwater pearls are below 1000, but for color-treated golden pearls, they are higher than 2000. The intensity of 275 cm^-1 Raman band in golden saltwater pearls is more stronger than that of the color-treated one, where it has been covered by the fluorescence background. In the near ultraviolet region （200 nm--400 nm） of UV-visible absorption spectrum, characteristic absorption peaks of 284 nm and 357 nm were found in golden saltwater pearls. But those characteristic absorption peaks in spectrums of colortreated golden pearls are missing, wihich are either red shifted （408 nm） or disappeared. According to the differences of Raman and UV-visible spectrums between golden saltwater pearls and color-treated golden pearls, they can be quickly and effectively set apart without any damage.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2009年第6期1706-1709,共4页
Acta Optica Sinica
基金
上海市重点学科建设项目(B502)
浙江省重大科技攻关招标项目(81)资助课题
关键词
光谱学
珍珠鉴定
拉曼光谱
紫外可见吸收光谱
金黄色海水珍珠
颜色处理
spectroscopy
identification of pearl
Raman spectrum
UV-visible absorption spectrum
golden saltwater pearl
color treated
