Biofuel Engine Research Facility (BERF) biodiesel campaign

A Volatility Tandem Differential Mobility Analyzer (V-TDMA) consisting of an electrostatic classifier, a thermo-denuder and an SMPS (Scanning Mobility Particle Sizer, in-house designed column with a 3010 CPC) measured the volatile content of particles. The V-TDMA gave the change in particulate diameter for six pre-selected sizes. The volumetric volatile fraction (VVF) for each size was calculated from the difference in diameter of particles before and after the thermo-denuder. The total amount of volatile matter is calculated for every sampling point and the parameter used for its quantification is the Overall Volatility (OV). OV is the fraction of total organics measured in the particulate phase to the total measured volume of particulate matter. An in-house developed profluorescent molecular probe BPEAnit was applied to assess particulate oxidative potential. The relationships between the variables were analysed using the linear regression or generalised linear model with a log link function. The model assumptions were validated using the residuals versus fit values and QQ plots. The resulting fit functions, and their 95% condense intervals, indicate the relationship between the variables.

Modelling and visualisations were performed using the ggplot2 package in R. The data consists of: 121 raw files from two instruments: Scanning Mobility Particle Sizer (SMPS) and Volatility Tandem Mobility Analyser (VTDMA); 12 Excel files containing some roughly processed data from the raw data; 12 .CSV files containing sorted and prepared data for using in R; 19 figures generated by R. File formats: Raw files are in .P80 and .S80 formats; Excel files are in .xls format; R data is in .CSV format; 11 figures are in .PDF format; 8 figures are in .TIFF format; Technical attributes of data collection: P80 and S80 files can be read by TIS Aerosol Instrument Manager; .XLS files are accessible using MS Excel; .CVS files are usable by any data processing software; .PDF file can be seen by Adobe Reader; .TIFF file can be viewed using any image viewer software.

This research forms part of the project Effect of atmospheric ageing on volatility and ROS of biodiesel exhaust nano-particles.

一项由静电分类器、热脱除器和扫描迁移率粒度分析仪（SMPS，内置设计柱，配备3010 CPC）组成的挥发性串联迁移率分析仪（V-TDMA）被用于测量颗粒物的挥发性含量。V-TDMA提供了六个预先选定尺寸的颗粒物直径变化。通过计算热脱除前后颗粒物直径的差异，得出了每个尺寸的体积挥发性分数（VVF）。在每个采样点计算挥发性物质的总含量，并使用总体挥发性（OV）参数进行量化。总体挥发性是颗粒相中测量的总有机物与颗粒物总体积测量的分数。一种内部开发的荧光分子探针BPEAnit被应用于评估颗粒物的氧化潜力。使用线性回归或广义线性模型（具有对数连接函数）分析了变量之间的关系。通过残差与拟合值以及Q-Q图验证了模型假设。所得的拟合函数及其95%置信区间表明了变量之间的关系。

建模和可视化使用R中的ggplot2包进行。数据包括：来自两种仪器（扫描迁移率粒度分析仪（SMPS）和挥发性串联迁移率分析仪（VTDMA））的121个原始文件；包含从原始数据中粗略处理的一些数据的12个Excel文件；12个用于在R中使用的排序和准备好的数据的.CSV文件；19个由R生成的图形。文件格式：原始文件为.P80和.S80格式；Excel文件为.xls格式；R数据为.CSV格式；11个图形为.PDF格式；8个图形为.TIFF格式；数据收集的技术属性：P80和S80文件可由TIS气溶胶仪器管理器读取；.XLS文件可通过MS Excel访问；.CSV文件可用于任何数据处理软件；.PDF文件可通过Adobe Reader查看；.TIFF文件可通过任何图像查看软件查看。

本研究是项目“大气老化对生物柴油尾气纳米颗粒挥发性及活性氧（ROS）的影响”的一部分。