福建省南平市茫荡山2009年3~4月_gac_g

福建南平茫荡山用GAC测大气气态物种浓度。数据收集时间为2009年3~4月，地点为福建省南平市茫荡山。GAC（Gas-Aerosol-Collector）是本实验室自主开发的气体、气溶胶连续在线收集装置。此套装置利用气体和气溶胶扩散系数的差异，使用湿式环形扩散管（Wet Denuder）把大气中的气态污染物和气溶胶有效的分离，消除了采样时气态污染物和气溶胶之间的干扰，并在扩散管内收集气态污染组分（HF、HCl、HONO、SO2、WSOC、NH3等），然后使用蒸汽喷射原理采集气溶胶中的水溶性组分（阴阳离子组份：F-、Cl-、NO2-、SO42-、 NH4+、Na+、Ca2+、水溶性有机酸离子等），采集到的样品交替送到成分分析仪器进行样品分析，实现了气态污染物和气溶胶的连续收集和在线测量。GAC收集到的水溶液样品进入ICS-90（Dionex， 美国）型阴离子色谱仪即时分析，测定样品中的F-、Cl-、NO2-、NO3-、SO32-、SO42-共6种阴离子。

Atmospheric gaseous species concentrations were measured using a Gas-Aerosol-Collector (GAC) at Mangdang Mountain, Nanping, Fujian Province, China. The field data were collected from March to April 2009. The GAC is a continuous online sampling and collection device for gaseous substances and aerosols independently developed by our laboratory. This device utilizes the differences in diffusion coefficients between gaseous species and aerosols, and adopts a Wet Denuder to effectively separate atmospheric gaseous pollutants and aerosols, eliminating the interference between the two during sampling. Gaseous pollutant components such as HF, HCl, HONO, SO₂, WSOC, NH₃, etc., are collected inside the denuder. Then, water-soluble components in aerosols (including anionic and cationic species: F⁻, Cl⁻, NO₂⁻, SO₄²⁻, NH₄⁺, Na⁺, Ca²⁺, water-soluble organic acid ions, etc.) are collected through the steam jet principle. The collected samples are alternately sent to compositional analysis instruments for analysis, realizing continuous collection and online measurement of gaseous pollutants and aerosols. The aqueous samples obtained from the GAC are immediately analyzed by an ICS-90 anion chromatograph (Dionex, USA) to detect six anions in the samples: F⁻, Cl⁻, NO₂⁻, NO₃⁻, SO₃²⁻, and SO₄²⁻.