Abstract Due to new pollutant emissions standards, internal combustion engines need several emission control strategies (and related procedures) such as exhaust gas recirculation, diesel/gasoline particulate filters, and selective catalyst reduction that allow them to comply with complete requirements defined on those standards. These strategies result in faster degradation of engine oil, one of the most relevant consequences of which is an increase in soot contamination level. All of these strategies facilitate soot generation. Consequently, soot is one of the most important contaminants present in engine oil. The main technique to measure the content of soot in oil is thermogravimetric analysis (TGA), but this technique has certain limitations. TGA requires a long and specific procedure and has limitations in measuring small concentrations of soot in oil. Therefore, the design of an alternative technique to quantify soot in oil is relevant. One alternative is Fourier transform infrared (FTIR) spectroscopy, but it also has limitations related to low concentrations of soot in oil. This work presents an alternative technique based on ultraviolet-visible (UV-Vis) spectroscopy that allows quantification of small soot contents in used engine oil samples and avoids potential interference from other typical contaminants or those related to measurement processes, such as sample cuvette material.

中文翻译：

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通过紫外-可见光谱法量化发动机油中烟灰的另一种方法

摘要 由于新的污染物排放标准，内燃机需要多种排放控制策略（和相关程序），例如废气再循环、柴油/汽油微粒过滤器和选择性催化还原，以使其符合这些标准中定义的完整要求。这些策略导致发动机油更快降解，其最相关的后果之一是烟灰污染水平的增加。所有这些策略都有利于碳烟的产生。因此，煤烟是发动机油中最重要的污染物之一。测量油中烟尘含量的主要技术是热重分析（TGA），但该技术具有一定的局限性。TGA 需要一个漫长而具体的程序，并且在测量油中小浓度烟尘方面存在局限性。因此，设计一种替代技术来量化油中的烟尘是相关的。一种替代方法是傅里叶变换红外 (FTIR) 光谱，但它也存在与油中烟灰浓度低相关的局限性。这项工作提出了一种基于紫外-可见 (UV-Vis) 光谱的替代技术，该技术允许对用过的发动机油样品中的小烟尘含量进行量化，并避免其他典型污染物或与测量过程相关的污染物（例如样品试管材料）的潜在干扰。但它也有与油中烟灰浓度低有关的局限性。这项工作提出了一种基于紫外-可见 (UV-Vis) 光谱的替代技术，该技术允许对用过的发动机油样品中的小烟尘含量进行量化，并避免其他典型污染物或与测量过程相关的污染物（例如样品试管材料）的潜在干扰。但它也有与油中烟灰浓度低有关的局限性。这项工作提出了一种基于紫外-可见 (UV-Vis) 光谱的替代技术，该技术允许对用过的发动机油样品中的小烟尘含量进行量化，并避免其他典型污染物或与测量过程相关的污染物（例如样品试管材料）的潜在干扰。