Determination of trace elements in polymers using fsLA-ICP-MS with internal standardization by carbon
Determination of trace elements in polymers using fsLA-ICP-MS with internal standardization by carbon
复制标题
DOI：
10.1039/d1ja00198a
复制
发表时间：
2021-07-30
影响因子：
3.4
通讯作者：
Nakazato, Tetsuya
中科院分区：
文献类型：
--
作者：
Makino, Yoshiki;Nakazato, Tetsuya
聚合物中微量元素的测定是环境研究和遵守的必要条件。传统的基于溶液的电感耦合等离子体质谱（ICP-MS）技术是耗时的，因为它需要样品分解;因此，更快的技术，如激光烧蚀电感耦合等离子体质谱（LA-ICP-MS）是非常需要的。LA-ICP-MS允许直接分析聚合物，这比使用溶液雾化ICP-MS更快。在以前的研究中，LA-ICP-MS已被应用于聚合物的元素分析，通过与基质匹配的标准或/和内标校准。然而，由于基体效应，含氧聚合物的定量分析和使用碳的内标化尚未实现。在这项研究中，我们报告了5种不同的聚合物的碳浓度范围从45.620至85.543%，并含有杂原子，如氧和氯使用飞秒（fs）LA-ICP-MS与碳的内部标准化的分析。通过优化激光能量密度，使微量元素与碳之间的元素分馏最小化。对聚乙烯、聚酯、丙烯腈-丁二烯-苯乙烯、聚氯乙烯、聚丙烯等高分子标准物质中的微量元素Cr、Br、Cd、Hg、Pb进行了测定。校正曲线的决定系数（R-2）由未经内标的0.8067-0.9880提高到经C-13内标的0.9556-0.9993。经C-13内标法测定，其浓度与标准值一致，偏差在30%以内。据观察，无论聚合物中碳和杂原子的浓度如何，用C-13进行内标化都是有效的。这些结果表明，聚合物基体效应得到补偿。因此，采用C-13内标，fsLA-ICP-MS法可用于聚合物中Cr、Br、Cd、Hg、Pb的测定。
Determination of trace elements in polymers is necessary for environmental research and compliance. The conventional solution-based inductively coupled plasma-mass spectrometry (ICP-MS) technique is time-consuming because it requires sample decomposition; thus, a faster technique such as laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) is highly desired. LA-ICP-MS allows the direct analysis of polymers, which is faster than using solution nebulization ICP-MS. In previous studies, LA-ICP-MS has been applied for the elemental analysis of polymers by calibrating with matrix-matched standard or/and internal standardization. However, the quantitative analysis of polymers containing oxygen and internal standardization using carbon have not been achieved due to the matrix effect. In this study, we report the analysis of 5 different polymers with carbon concentration ranging from 45.620 to 85.543% and containing heteroatoms such as oxygen and chlorine using a femtosecond (fs) LA-ICP-MS with internal standardization by carbon. By the optimization of laser fluence, elemental fractionation between trace elements and carbon was minimized. Trace elements (Cr, Br, Cd, Hg and Pb) in polymer reference materials including, polyethylene, polyester, acrylonitrile butadiene styrene, polyvinyl chloride, and polypropylene, were determined. The coefficients of determination (R-2) of the calibration curves were improved from 0.8067-0.9880 without internal standardization to 0.9556-0.9993 with internal standardization by C-13. The determined concentrations agreed with the certified value with deviation within 30% via internal standardization by C-13. It was observed that internal standardization with C-13 is effective regardless of the concentration of carbon and heteroatoms in the polymers. These results show that the polymer matrix effect was compensated. Therefore, fsLA-ICP-MS and internal standardization by C-13 can be used for the determination of Cr, Br, Cd, Hg and Pb in polymers.