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首页> 外文期刊>Journal of mass spectrometry: JMS >Detection and imaging of chrome yellow (lead chromate) in latent prints, solid residues, and minerals by laser-desorption/ionization mass spectrometry (LDI-MS)
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Detection and imaging of chrome yellow (lead chromate) in latent prints, solid residues, and minerals by laser-desorption/ionization mass spectrometry (LDI-MS)

机译：激光解吸/电离质谱（LDI-MS）中潜伏印刷，固体残留物和矿物质中铬黄（铅铬酸酯）的检测和成像

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摘要

In the past, chrome yellow (lead chromate, PbCrO4), a bright orange-red substance, has been widely used as an inorganic pigment in the production of paints, coatings, and plastics. Herein, we demonstrate that laser desorption/ionization mass spectrometry (LDI-MS) is a powerful tool for the detection of lead chromate in solid residues. In fact, lead chromate in trace amounts is easily detectable by LDI-MS even from residues left as latent prints. For example, a latent print obtained by stamping the exposed laterally cut surface of a pencil over 50 years old on an acetonitrile-moistened paper, was successfully imaged for both lead and chromate using a Synapt G2 HDMS mass spectrometer. After rastering the print with a 355nm laser beam and recording positive-and negative-ion mass spectra over the range m/z 50-1200, we generated false-color 'heat maps' (single-ion images) for Pb-208(+)degrees (m/z 207.98) and Cr2O6-degrees (m/z 199.85). The heat maps matched closely with the faint visual image of the pencil imprint. Moreover, our results confirmed that lead chromate was used in the pigment coatings of old pencils. Evidently, LDI-MS imaging is an efficient procedure to survey for the presence of lead and chromate in minerals and other materials. Copyright (C) 2017 John Wiley & Sons, Ltd.
机译：过去，铬黄（铅铬酸盐，PBCRO4），明亮的橙红色物质已被广泛应用于油漆，涂料和塑料的无机颜料。在此，我们证明激光解吸/电离质谱（LDI-MS）是用于检测固体残余物中铅铬酸盐的强大工具。实际上，即使从作为潜在印刷品的残留物中，LDI-MS也可以通过LDI-MS易于检测到痕量的铅铬酸盐。例如，通过用乙腈润湿的纸上的铅笔在50岁以上的铅笔的暴露横向切割表面获得的潜在印刷，用于使用Synapt G2 HDMS质谱仪来成功成功地成像铅和铬酸盐。在用355nm激光束的打印结束并在M / Z 50-1200范围内记录正极和负离子质谱后，为PB-208产生假色“热图”（单离子图像）（+ ）度（m / z 207.98）和Cr2O6度（m / z 199.85）。热图与铅笔印记的微弱视觉图像紧密相匹配。此外，我们的结果证实，铅铬酸盐在旧铅笔的颜料涂料中使用。显然，LDI-MS成像是在矿物和其他材料中进行铅和铬酸盐的存在调查的有效手术。版权所有（c）2017 John Wiley＆Sons，Ltd。

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