Evidence for Gas-Surface Equilibrium Control of Indoor Nitrous Acid
Evidence for Gas-Surface Equilibrium Control of Indoor Nitrous Acid
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DOI：
10.1021/acs.est.8b04512
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发表时间：
2018-11-06
影响因子：
11.4
通讯作者：
Abbatt, Jonathan P. D.
中科院分区：
文献类型：
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作者：
Collins, Douglas B.;Hems, Rachel F.;Abbatt, Jonathan P. D.
亚硝酸（HONO）是室内空气中的重要组成部分，是产生羟基自由基的光不稳定前体，对人体健康有直接影响。HONO浓度通常在室内高于室外，尽管室内浓度已被证明具有挑战性，使用箱模型进行预测。在这项研究中，住宅中HONO和NO2的时间分辨测量表明，[HONO]在连续的几个小时内变化相对较弱，而[NO2]则与室外[NO2]的变化相关。进行了扰动实验，其中室内HONO耗尽或升高，并使用两室箱模型进行解释。为了重现测量结果，[HONO]必须使用不直接涉及NO2的持久源和汇过程进行预测，这表明HONO与室内表面处于平衡状态。生产的气相HONO直接从表面上的NO2转化有一个微弱的影响室内[HONO]在扰动的时间。高度相似的时间响应HONO和半挥发性羧酸通风的住宅沿着与室内表面上的亚硝酸盐的检测支持的概念，室内HONO混合比强烈控制的气体-表面平衡。
Nitrous acid (HONO) is an important component of indoor air as a photolabile precursor to hydroxyl radicals and has direct health effects. HONO concentrations are typically higher indoors than outdoors, although indoor concentrations have proved challenging to predict using box models. In this study, time-resolved measurements of HONO and NO2 in a residence showed that [HONO] varied relatively weakly over contiguous periods of hours, while [NO2] fluctuated in association with changes in outdoor [NO2]. Perturbation experiments were performed in which indoor HONO was depleted or elevated and were interpreted using a twocompartment box model. To reproduce the measurements, [HONO] had to be predicted using persistent source and sink processes that do not directly involve NO2, suggesting that HONO was in equilibrium with indoor surfaces. Production of gas phase HONO directly from conversion of NO2 on surfaces had a weak influence on indoor [HONO] during the time of the perturbations. Highly similar temporal responses of HONO and semivolatile carboxylic acids to ventilation of the residence along with the detection of nitrite on indoor surfaces support the concept that indoor HONO mixing ratios are controlled strongly by gas-surface equilibrium.