So 2NO2 + H2O HONO + HNO3 is not the main formation mechanism for HONO artifact, too.In conclution, the main formation mechanism is the NO2 reducing reaction directly in the annular denuder.

• 故推测干扰机制为NO2于采样管内直接异相还原生成HONO，而HONO干扰浓度随著进气NO2浓度增加而呈饱和生成曲线关系。