中文摘要：

亚硝酸在冰晶中存在以下平衡：NO2^-H^＋=HONO H^＋=H2ONO^＋=H2O＋NO^＋，导致冰晶中的亚硝酸以4种形式的N（Ⅲ）：NO2^-，HONO，H2ONO^＋和NO^＋存在．实验发现，四种N（Ⅲ）在冰晶中分数与pH值有很大关系：pH〉3，主要以NO2^-和HONO形式存在；pH〈3，主要以HONO，H2ONO^＋和NO^＋形式存在．冰晶中的N（Ⅲ）借助以上平衡不断产生HONO并释放到大气中，导致冰晶中N（Ⅲ）不断损失．实验还发现，冰晶中N（Ⅲ）损失率随pH值的升高先升高后下降，随N（Ⅲ）初始浓度升高而升高．紫外光能使冰晶中N（Ⅲ）发生光解，但光解速率很慢，加入·OH猝灭剂也不能提高冰晶中N（Ⅲ）的光解率．

英文摘要：

The equilibrium equation of nitrous acid in ice：NO2^-H^＋=HONO H^＋=H2ONO^＋=H2O＋NO^＋ has demonstrated that nitrous acid （HONO） was present in ice in four different N （ Ⅲ ） species： NO2^-, HONO, H2ONO^＋ and NO^＋, the mole fraction of which has a strong dependence on pH. At pH 〉3, N（Ⅲ） species＇mainly included NO2 and HONO, while N （ Ⅲ ）existed by means of HONO, H2ONO^＋ and NO^＋ at pH 〈 3. HONO released from above dissociation equilibrium contributed to the loss of N （ Ⅲ ） in ice. The experiment results also showed that the loss percentage of N （Ⅲ ） first increased then decreased with the increasing pH, and increased with the increase of initial concentration of N（ Ⅲ ） Moreover, we studied the photolysis of N （Ⅲ） in ice and found photolysis reaction took place under UV light, but the rate of photolysis appeared to be very slow. Addition of · OH scavenger did not enhance its photolysis rate in lee.