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FTIR spectroscopy supported by statistical techniques for the structural characterization of plastic debris in the marine environment: Application to monitoring studies

机译:统计技术支持的FTIR光谱用于海洋环境中塑料碎片的结构表征:在监测研究中的应用

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We inserted 190 FTIR spectra of plastic samples in a digital database and submitted it to Independent Component Analysis (ICA) to extract the "pure" plastic polymers present. These identified plastics were polypropylene (PP), high density polyethylene (HDPE), low density polyethylene (LDPE), high density polyethylene terephthalate (HDPET), low density polyethylene terephthalate (LDPET), polystyrene (PS), Nylon (NL), polyethylene oxide (OPE), and Teflon (TEF) and they were used to establish the similarity with unknown plastics using the correlation coefficient (r), and the crosscorrelation function (CC). For samples with r < 0.8 we determined the Mahalanobis Distance (MD) as additional tool of identification. For instance, for the four plastic fragments found in the Carretta carretta, one plastic sample was assigned to OPE due to its r = 0.87; for all the other three plastic samples, due to the r values ranging between 0.83 and0.70, the support of MD suggested LDPET and OPE as co-polymer constituents. (C) 2016 Elsevier Ltd. All rights reserved.
机译:我们在一个数字数据库中插入了190个塑料样品的FTIR光谱,并将其提交给独立成分分析(ICA),以提取存在的“纯”塑料聚合物。这些确定的塑料是聚丙烯(PP),高密度聚乙烯(HDPE),低密度聚乙烯(LDPE),高密度聚对苯二甲酸乙二醇酯(HDPET),低密度聚对苯二甲酸乙二醇酯(LDPET),聚苯乙烯(PS),尼龙(NL),聚乙烯氧化物(OPE)和聚四氟乙烯(TEF),并使用相关系数(r)和互相关函数(CC)来建立与未知塑料的相似性。对于r <0.8的样本,我们将马氏距离(MD)确定为附加的识别工具。例如,对于在Carretta carretta中发现的四个塑料碎片,由于r = 0.87,因此将一个塑料样品分配给了OPE。对于所有其他三个塑料样品,由于r值介于0.83和0.70之间,因此MD的支持表明LDPET和OPE为共聚物成分。 (C)2016 Elsevier Ltd.保留所有权利。

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