2018-2019年关中地区大气环境地面监测站PM2.5化学组分（水溶性离子、元素、碳组分）数据

本研究为了获得关中区域颗粒物的化学组分时空分布特征，及关中区域污染来源解析，在重点观测站点包括西安、咸阳、渭南、宝鸡和铜川及背景点秦岭设置采样站点并开展观测工作。在5个常规观测点，进行为期1年的滤膜样品采集。使用仪器为5L/min的微流量采样器（MiniVol TAS），每张直径47mm的石英滤膜样品需连续采集24小时，监测时段为10：00至次日10：00。通过将采集到的样品滤膜进行称重、剪切、水溶等前处理工作，再通过DRI2001碳分析仪、Metrohm-940型离子色谱仪、能量色散型X 射线荧光光谱仪进一步分析，获得样品化学组分数据，包括OC、EC、NO3-、SO42-、NH4+、Mg、K、Ca、Mn 等38个化学分析组分。

This study was conducted to characterize the spatiotemporal distribution of chemical components of particulate matter in the Guanzhong region and perform pollution source apportionment for the region. Sampling sites were established and field observations were carried out at key monitoring locations including Xi'an, Xianyang, Weinan, Baoji, and Tongchuan, as well as the Qinling Mountains as a regional background site. Filter membrane samples were collected over a one-year period at the five routine observation sites. A 5 L/min micro-flow sampler (MiniVol TAS) was used for sampling: each 47 mm diameter quartz filter membrane sample was continuously collected for 24 hours, with the monitoring window set from 10:00 to 10:00 the following day. Collected filter membrane samples underwent pretreatment procedures including weighing, cutting, and water dissolution, followed by further analysis using a DRI2001 carbon analyzer, Metrohm-940 ion chromatograph, and energy-dispersive X-ray fluorescence spectrometer. A total of 38 chemical components were quantified, including OC, EC, NO3-, SO42-, NH4+, Mg, K, Ca, Mn, and others.