Compared to the health effects, the research significance of n-alkanes is more focused on the environmental impacts. n-Alkanes are important environmental pollutants, their health effects are cytotoxicity resulting from interaction with other organic matter in particulate matter (Chen et al., 2019). We have tried our best to improve this manuscript, please find our itemized responses and revisions/corrections in below. Finally, some of the statements and diagrams in the article have been revised. In addition, we have consider the effect of meteorological factors on particulate-bound n-alkanes and have added the corresponding discussion.
We added the methodological details involved in the experimental procedure and additional literature support was provided for some of the ideas in the manuscript. We have carefully considered the suggestions and revised the manuscript accordingly. Thank you for your constructive comments on our manuscript. A.: GCxMS of Diesel: A Two-Dimensional Separation Approach, Anal. C1 through C30 Organic Compounds from Medium Duty Diesel Trucks, Environ. T.: Measurement of Emissions from Air Pollution Sources. K.: Summer and Winter Nonmethane Hydrocarbon Emissions from On-Road Motor Vehicles in the Midwestern United States, Air & Waste Manage. V.: Method and detailed analysis of individual hydrocarbon species from diesel combustion modes and diesel oxidation catalyst, J. H.: Elucidating secondary organic aerosol from diesel and gasoline vehicles through detailed characterization of organic carbon emissions, P.
Why can road dust be a source of alkanes with >C34? Explain the discrepancy with the results obtained by the authors of the actual study.
It is well known that gasoline is mostly comprised of hydrocarbons in the C4 to C10 range while diesel fuel consists of C8 to C25 hydrocarbons (Han et al., 2008 Schauer et al., 1999 Lough et al., 2005 Gentner et al., 2012 Wang et al., 2005). Was a calibration curve used, external standards, internal standards, isotopic dilution, etc.? Explain the details of the quantitative analysis. It is not clear how the alkanes were quantified.Explain what was the procedure to evaluate the recovery efficiency of the alkanes by the analytical method used? What were the concentrations spiked? and how many repetitions were made?. How was the alkanes mass lost considered to calculate their concentrations in the air? In the gravimetric procedure carried out at 20☌ for 24 h to obtain the particulate mass, the mass of some organic compound is lost due to evaporation during this time. What are the human health effects of alkanes in PM2.5 mentioned by the authors? Provide the references. The alkanes are irrelevant from the point of view of air quality and human health, since alkanes are not toxic to humans. The authors should further justify the interest in studying alkanes in PM2.5.The article cannot be published in its current state. Methodological details are lacking, some comments are not properly supported, information on atmospheric criteria pollutants associated with the air quality is missing, as well as the meteorology. The study is a longitudinal descriptive analysis. The authors propose emission sources using some ratios as well as a multivariate test. The article describes the temporal behaviour of n-alkanes in Beijing China on some days during 1 year of measurements.
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