【引用本文】 邵惠萍, 严雪俊, 严俊, 等. 应用傅里叶变换红外光谱与紫外可见吸收光谱鉴别两类海水养殖灰色珍珠[J]. 岩矿测试, 2019, 38(5): 489-496. doi: 10.15898/j.cnki.11-2131/td.201809280109
SHAO Hui-ping, YAN Xue-jun, YAN Jun, et al. Identification of Two Kinds of Seawater Cultured Gray Pearls by Fourier Transform Infrared Spectroscopy and Ultraviolet-visible Absorption Spectroscopy[J]. Rock and Mineral Analysis, 2019, 38(5): 489-496. doi: 10.15898/j.cnki.11-2131/td.201809280109

应用傅里叶变换红外光谱与紫外可见吸收光谱鉴别两类海水养殖灰色珍珠

1. 

浙江方圆检测集团股份有限公司, 浙江 杭州 310013

2. 

浙江工业大学分析测试中心, 浙江 杭州 310014

3. 

浙江工业大学温州科学技术研究院, 浙江 温州 325024

收稿日期: 2018-09-28  修回日期: 2019-03-14  接受日期: 2019-04-09

基金项目: 浙江省公益技术应用研究(2017C37001);浙江省质监系统公益科研项目(20170206)

作者简介: 邵惠萍, 工程师, 主要从事宝玉石检测及科研工作。E-mail:609542506@qq.com

通信作者: 胡仙超, 博士, 副研究员, 主要从事宝玉石及矿物功能材料研究。E-mail:huxc@zjut.edu.com

Identification of Two Kinds of Seawater Cultured Gray Pearls by Fourier Transform Infrared Spectroscopy and Ultraviolet-visible Absorption Spectroscopy

1. 

Zhejiang Fangyuan Test Group Co., LTD, Hangzhou 310013, China

2. 

Research Center of Analysis and Measurement, Zhejiang University of Technology, Hangzhou 310014, China

3. 

Wenzhou Institute of Science and Technology, Zhejiang University of Technology, Wenzhou 325024, China

Corresponding author: HU Xian-chao, huxc@zjut.edu.com

Received Date: 2018-09-28
Revised Date: 2019-03-14
Accepted Date: 2019-04-09

摘要:Akoya珍珠属生物矿化有机宝玉石,该类珍珠的矿物组成与微结构分析、定性与其颜色形成属性的鉴定方法尚为缺乏。本文通过光学显微镜、紫外可见吸收光谱、傅里叶变换红外光谱、能量色散X射线荧光光谱对具有白色或灰色珠核的两类Akoya灰色珍珠的珍珠层与珠核的结构特征及显色机制、紫外吸收光谱、微量金属元素赋存特征进行了对比研究。结果表明:①灰色珍珠的珠核有白色与灰色两类,两类珍珠的直径主要分布在5~9mm,珍珠层厚度约300~500μm;②两类珍珠的珍珠层和珠核的主体矿物组成均为生物文石,且两者的珍珠层中均富Sr贫Mn。③灰色的珠核具有明显的富Mn特征,且由于辐照使得Mn元素的价态升高并使得珠核致灰色,并导致整个珍珠呈现灰色;④紫外可见吸收光谱检测中,一般而言具有白色珠核的灰色珍珠在300~400nm波段可见明显的反射带,而具有灰色珠核的灰色珍珠在400~500nm波段可见明显的反射带。两类灰色珍珠皆为海水养殖珍珠,研究表明这两类珍珠的紫外吸收光谱的差异可作为初步评判灰色系珍珠是否经辐照改色的依据之一。

关键词: 灰色珍珠, 紫外可见吸收光谱, 结构, 珍珠层, 珠核, 辐照处理

要点

(1) 对两类灰色珍珠(以白色或灰色珠核区分)微结构形貌、微量元素和矿物组成开展对比性研究。

(2) 紫外可见吸收光谱差异可作为两类灰色珍珠筛选判别的依据。

(3) 本工作对有核珍珠颜色的形成与构色机制研究具有重要的补充。

Identification of Two Kinds of Seawater Cultured Gray Pearls by Fourier Transform Infrared Spectroscopy and Ultraviolet-visible Absorption Spectroscopy

ABSTRACT

BACKGROUND:

Akoya pearl is a biomineralized organic gemstone. The mineral composition and microtextural analysis, and the identification method of color formation of this type of pearl are still lacking.

OBJECTIVES:

To identify natural gray pearls from treated-color gray pearls.

METHODS:

The spectroscopic and textural characteristics of two kinds of seawater cultured gray pearls with white or gray nucleus were comparatively investigated by optical microscope, Fourier transform infrared spectroscopy, ultraviolet-visible absorption spectroscopy, and energy dispersive X-ray fluorescence spectrometry.

RESULTS:

The gray pearls with white or gray nucleus had diameters from 5mm to 9mm, the thickness of 300-500μm. The nacreous layer and its corresponding nucleus of the two kinds of gray pearls were composed mainly of biological aragonite, and their corresponding nacreous layers were rich in Sr and poor in Mn. The pearl with the gray nucleus was rich in Mn. The valence state of Mn was increased due to irradiation, resulting in gray of the pearl core and the whole pearl. In general, the pearls with a white nucleus had an obvious reflection band from 300nm to 400nm in the ultraviolet-visible absorption spectra. On the contrary, those pearls with a light or heavy gray nucleus had a reflection band from 400nm to 500nm.

CONCLUSIONS:

The two types of gray pearls are all marine cultured pearls. The difference of ultraviolet absorption spectra of the two types of pearls can be used as a basis for judging whether the gray pearls are irradiatedly colored.

KEY WORDS: gray pearl, ultraviolet-visible absorption spectroscopy, structure, nacreous layer, nucleus, irradiation treatment

HIGHLIGHTS

(1) The structural morphology, trace element content and mineral composition of two kinds of seawater cultured gray pearls with white or gray nucleus were investigated.

(2) The difference of the ultraviolet-visible absorption spectra can be used as the basis for the discrimination of two kinds of gray pearls.

(3) This work is an important supplement to research of the color formation and color construction mechanism of nucleated pearls.

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应用傅里叶变换红外光谱与紫外可见吸收光谱鉴别两类海水养殖灰色珍珠

邵惠萍, 严雪俊, 严俊, 王金, 余思逸, 彭秋瑾, 胡仙超