Detailed offline speciation of gas- and particle-phase organic compounds was conducted using gas/liquid chromatography with traditional and high-resolution mass spectrometers in a hybrid targeted/nontargeted analysis. Observations were focused on an unoccupied home and were compared to two other indoor sites. Observed gas-phase organic compounds span the volatile to semivolatile range, while functionalized organic aerosols extend from intermediate volatility to ultra-low volatility, including a mix of oxygen, nitrogen, and sulfur-containing species. Total gas-phase abundances of hydrocarbon and oxygenated gas-phase complex mixtures were elevated indoors and strongly correlated in the unoccupied home. While gas-phase concentrations of individual compounds generally decreased slightly with greater ventilation, their elevated ratios relative to controlled emissions of tracer species suggest that the dilution of gas-phase concentrations increases off-gassing from surfaces and other indoor reservoirs, with volatility-dependent responses to dynamically changing environmental factors. Indoor–outdoor emissions of gas-phase intermediate-volatility/semivolatile organic hydrocarbons from the unoccupied home averaged 6–11 mg h^–1, doubling with ventilation. While the largest single-compound emissions observed were furfural (61–275 mg h^–1) and acetic acid, observations spanned a wide range of individual volatile chemical products (e.g., terpenoids, glycol ethers, phthalates, other oxygenates), highlighting the abundance of long-lived reservoirs resulting from prior indoor use or materials, and their gradual transport outdoors.

中文翻译：

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使用高分辨率质谱法评估室内空气化学多样性、室内到室外排放和地表储层

在混合靶向/非靶向分析中，使用气相/液相色谱与传统和高分辨率质谱仪进行气相和颗粒相有机化合物的详细离线形态分析。观察集中在一个空置的房屋上，并与其他两个室内地点进行了比较。观察到的气相有机化合物跨越挥发性到半挥发性范围，而功能化有机气溶胶从中等挥发性延伸到超低挥发性，包括氧、氮和含硫物质的混合物。碳氢化合物和含氧气相复杂混合物的总气相丰度在室内升高，并且在无人居住的房屋中具有很强的相关性。虽然单个化合物的气相浓度通常会随着通风的增加而略有下降，它们相对于示踪物种的受控排放的比率升高表明，气相浓度的稀释增加了地表和其他室内水库的废气排放，并对动态变化的环境因素做出了与波动性相关的反应。空置房屋的气相中挥发性/半挥发性有机碳氢化合物的室内-室外排放量平均为 6-11 mg h^–1，加倍通风。虽然观察到的最大单一化合物排放物是糠醛 (61–275 mg h ^–1 ) 和乙酸，但观察结果涵盖了广泛的单个挥发性化学产品（例如，萜类化合物、乙二醇醚、邻苯二甲酸盐、其他含氧化合物），突出了丰富的由先前的室内使用或材料产生的长寿命水库，以及它们在室外的逐渐运输。