银灰色马氏贝海水珍珠的光谱学特征与颜色成因  

Spectral Characteristics and Coloration Mechanism of Silver-gray Color Seawater Cultured Pearls Produced by Pinctada Martensii

作　　者：宋彦军 张义丞[3] 武云龙 张璐 

机构地区：[1]河北地质大学宝石与材料工艺学院,河北石家庄050000 [2]长安大学地球科学与资源学院,陕西西安710000 [3]国家金银饰品质量监督检验中心,天津300000 [4]河北省地矿局探矿技术研究院,河北廊坊065000

出　　处：《矿物学报》2017年第6期712-716,共5页Acta Mineralogica Sinica

基　　金：国家自然科学基金项目(批准号:41303027)

摘　　要：结合红外光谱(FTIR)、拉曼光谱、紫外-可见光谱(UV-VIS)和激光剥蚀电感耦合等离子体质谱(LA-ICP-MS)技术对市面上一种产自马氏贝的银灰色海水养殖珍珠进行了测试,并与白色马氏贝珍珠进行对比以研究其致色机理。红外测试结果表明,2种样品的珍珠质层中由[CO_3]^(2-)面外弯曲振动引起的吸收峰均存在明显蓝移现象明显;拉曼光谱显示银灰色样品中无类胡萝卜素或其它多烯化合物色素中由C=C和C-C伸缩振动引起的特征吸收峰;UV-VIS图谱显示银灰色珍珠在可见光区域存在475~555 nm的吸收谷,未见金属卟啉类色素吸收峰;LA-ICP-MS测试结果表明银灰色珍珠样品中Mg、Mn元素含量相对较高而Pb元素含量较低,结合光谱学测试结果,认为微量金属元素通过与蛋白质络合改变珍珠层微观结构是银灰色形成的主要原因。Spectral characteristics and coloration mechanism of silver-gray seawater cultured pearls produced by Pinctada fucata martensii were studied by Fourier transform infrared（FTIR） spectroscopy, Raman spectroscopy, Ultraviolet–visible spectroscopy reflectance spectrometry（UV-VIS） and laser ablation-inductively coupled plasma-mass spectrometry（LA-ICP-MS）. White color seawater cultured pearls samples have also been tested as reference. FTIR and Raman spectra reveal that the main mineral component of the silver-gray color seawater cultured pearls is aragonite and no characteristic peaks caused by organic pigment obtained,but mean value of 876 cm^-1 which caused by v2 vibration is higher than natural inorganic aragonite obviously in FTIR spectroscopy. UV-VIS spectra indicate that white seawater pearls have no absorption in visible region when silver-blue-gray color pearls have the absorption region at 475-555 nm. LA-ICP-MS results show that the contents of Mg and Mn in silver-gray color samples are higher than those in white samples which may be the main cause of coloration of silver-gray pearls.

关 键 词：海水珍珠 致色机理 光谱学 马氏贝 

分 类 号：P574.2[天文地球—矿物学] P575.4[天文地球—地质学]