Significant HONO formation by the photolysis of nitrates in the presence of humic acids

Environmental Pollution
Wangjin YangXiangxin Xue

Abstract

The generation of HONO and NO2 by the photolysis of nitrates in the presence of humic acids (HA) was measured under various conditions. The photolysis experiments of HA, KNO3 and KNO3/HA under simulated sunlight was carried out by a flow tube reactor at ambient temperature and pressure. HONO and NO2 were major products by the photolysis of KNO3. By contrast, the photolysis of HA and KNO3/HA mainly generated HONO. HA significantly enhanced the formation of HONO during the photolysis process of KNO3. With increasing the KNO3 mass, the HONO formation rate (RHONO) on KNO3/HA increased while the photolysis rate normalized by the KNO3 mass exhibited an opposite trend. RHONO on KNO3/HA linearly increased with irradiation intensity (88-262 W/m2) and relative humidity (7-70%), whereas it linearly decreased with the pH (pH = 2-12). In addition, the reaction paths of the HONO formation by the photolysis of nitrates in the presence of HA were proposed according to experimental results. Finally, atmospheric implications of the enhanced HONO formation by the photolysis of nitrates in the presence of HA were discussed.

Citations

Oct 7, 2020·Indoor Air·Antoine DepoorterChristian George
Nov 28, 2020·Environmental Science and Pollution Research International·Hang YangShibin Xia
Feb 28, 2021·Journal of Environmental Sciences (China)·Wenwen XuXiangxin Xue
May 1, 2021·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Giovanna Marussi, Davide Vione
Jan 5, 2021·Environmental Science & Technology·Qianwen ShiQing Ye

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