用傅里叶变换红外光谱观察发动机油中乙二醇-水污染二元混合物的信号抑制效果

Standards Pub Date : 2022-11-01 DOI:10.3390/standards2040032
Torrey E Holland, R. Karunanithy, Christopher Mandrell, A. Abdul-Munaim, Dennis G. Watson, P. Sivakumar
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摘要

利用傅里叶变换红外光谱对防冻液(乙二醇)的基质效应和机油的水污染进行了深入的实验研究。通过比较受污染的新鲜15W-40发动机油的体积浓度百分比,当乙二醇防冻液作为污染物加入时,红外光谱中的O-H拉伸信号明显减少。对蒸馏水、水和商用乙二醇防冻剂的50/50混合物和直接乙二醇防冻剂的污染物进行了比较,当乙二醇存在时,O-H拉伸的信号减少明显。与单独的水相比,50/50混合物的体积增加了一倍,仍然会导致O-H拉伸信号变弱。这种信号减少的可能性是由于较大的乙二醇分子具有更少的O-H键在给定的样本大小,通过比较样品与相同数量的O-H键每单位体积消除。水和乙二醇之间的强氢键似乎降低了O-H拉伸信号,即使在比较不同样品类型的浓度下,每单位体积的O-H键数相同。Tukey的高度显著差异被用来表明,当比较单位体积相同数量的O-H键时,50/50混合物和直乙二醇的样品不能可靠地相互区分,但很容易与作为唯一污染物的水区分开来。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Observation of a Signal Suppressing Effect in a Binary Mixture of Glycol-Water Contamination in Engine Oil with Fourier-Transform Infrared Spectroscopy
An in-depth experimental study of the matrix effect of antifreeze (ethylene glycol) and water contamination of engine oil through FT-IR spectroscopy. With a comparison of the percent by volume concentration of contaminated fresh 15W-40 engine oil, there appeared to be a noticeable reduction in the O–H stretching signal in the infrared spectrum when ethylene glycol based antifreeze was included as a contaminant. The contaminants of distilled water, a 50/50 mixture of water and commercial ethylene glycol antifreeze, and straight ethylene glycol antifreeze were compared and a signal reduction in the O–H stretch was clearly evident when glycol was present. Doubling the volume of the 50/50 mixture as compared to water alone still resulted in a weaker O–H stretching signal. The possibility that this signal reduction was due to the larger ethylene glycol molecule having fewer O–H bonds in a given sample size was eliminated by comparing samples with the same number of O–H bonds per unit volume. The strong hydrogen bonding between that of water and glycol appeared to reduce the O–H stretching signal, even after comparing the different sample types at concentrations with the same number of O–H bonds per unit volume. Tukey’s highly significant difference was used to show that samples of the 50/50 mixture and straight glycol were not reliably distinguishable from one another when comparing the same number of O–H bonds per unit volume but readily distinguishable from that of water as the lone contaminant.
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