Potential use of surface-assisted LIBS or determination of strontium in wines

Bockova J.; Roldan A. Marin; Yu J.; Veis P.

摘要

Laser-induced breakdown spectroscopy (LIBS) is a well-established technique for elemental analysis and has been widely used for qualitative and quantitative analysis of different solid samples. LIBS is also well-known for not requiring sample preparation, but the analysis of liquids is actually a great challenge. In the present work, a novel approach of elemental analysis of liquids with an organic matrix has been performed, to the best of our knowledge, making a liquid-to-solid matrix conversion by drying wine samples on aluminum and silicon wafers, which have demonstrated an increase in the analytical performance of LIES. A red wine from Slovakia (not blended with any other variety or wine from other regions or adulterants) was prepared according to the procedure consisting of drying 2 ml of wine dropped on a solid wafer having a flat surface area of about 25 cm(2) . Surface-assisted LIES in combination with the conversion of liquid into solid avoids the difficulties and limitations of working with liquid samples by LIBS, improving the limit of detection (LOD), repeatability, and sensitivity. The quantification of strontium (Sr) has been realized by addition of the known concentration of SrCl2 center dot 6H(2)O in wine before the drying process. Sr is an important element among those usually used as markers for identification of the soils on which the vines grow. Two ionic (407.771 nm and 421.552 nm) and two neutral (460.733 nm and 481.188 nm) Sr lines were used to plot the calibration curves in order to study the LODs and the matrix effects for the analysis of Sr in the tested wines and for different wafer materials. This direct surface-assisted LIBS measuring method has been sucecsfully applied for the determination of Sr in a red wine sample from Slovakia, and the obtained results with two kinds of substrates (Al and Si) were compared. Finally, a validation sample has been employed to test the accuracy of the established calibration curves. (C) 2018 Optical Society of America

机译：激光诱导的击穿光谱（Libs）是一种用于元素分析的良好技术，并且已被广泛用于不同固体样品的定性和定量分析。 LIBS也是众所周知的，不需要样品制备，但液体的分析实际上是一个巨大的挑战。在本作本作中，据我们所知，已经进行了一种具有有机基质的液体的元素分析的新方法，通过在铝和硅晶片上干燥葡萄酒样品，使液体与固体矩阵转换进行证明谎言分析性能的增加。根据由干燥2ml酒在固平表面积为约25cm（2）的固体晶片上掉落的程序，制备来自斯洛伐克的红葡萄酒（来自其他地区或掺杂物中的任何其他种植体或掺杂剂的葡萄酒）。。表面辅助与液体转化为固体的延伸避免了利用Libs与液体样品一起使用的困难和限制，从而改善了检测限（LOD），可重复性和灵敏度。通过在干燥过程之前通过在葡萄酒中添加已知的SrCl2中心点6h（2）O来实现锶（SR）的定量。 SR是通常用作葡萄藤生长的土壤的标记的重要因素。两种离子（407.771nm和421.552nm）和两个中性（460.733nm和481.188nm）SR线路绘制校准曲线以研究床位和基质效应，用于分析测试的葡萄酒和不同的SR晶圆材料。这种直接表面辅助的Libs测量方法已经成功应用于从斯洛伐克的红葡萄酒样品中测定Sr，并比较了两种底物（Al和Si）的得到的结果。最后，已采用验证样本来测试建立的校准曲线的准确性。（c）2018年光学学会

Potential use of surface-assisted LIBS or determination of strontium in wines

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