Dissolution of sulfuric acid tetrahydrate at low temperatures and subsequent growth of nitric acid trihydrate
Dissolution of sulfuric acid tetrahydrate at low temperatures and subsequent growth of nitric acid trihydrate
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四水硫酸在低温下溶解，随后三水硝酸生长
DOI：
10.1029/98jd00281
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发表时间：
1998
影响因子：
--
通讯作者：
M. Tolbert
中科院分区：
文献类型：
--
作者：
L. Iraci;T. J. Fortin;M. Tolbert
结晶硫酸四水合物（SAT）已被观察到改变相的温度低于其熔点，与最近的理论预测潮解。在63%的实验中观察到SAT的溶解，预期会显示相变，导致形成三元HNO 3 /H2SO 4 /H2O溶液。该溶液仍含有一部分原始固体SAT，结晶形成硝酸三水合物（NAT）。然后NAT继续增长的冷凝额外的硝酸和水在温度几度以上的冰点。当S NAT > 15时，这种SAT溶解、NAT结晶和生长的过程可能为在冻结的硫酸盐气溶胶上形成Ia型极地平流层云提供了一种机制。
Crystalline sulfuric acid tetrahydrate (SAT) has been observed to change phase at temperatures below its melting point, in agreement with recent theoretical predictions of deliquescence. Dissolution of SAT was observed in 63% of experiments expected to show a phase change, leading to formation of a ternary HNO 3 /H 2 SO 4 /H 2 O solution. This solution, which still contained a portion of the original solid SAT, crystallized to form nitric acid trihydrate (NAT). NAT then continued to grow by condensation of additional nitric acid and water at temperatures several degrees above the ice frost point. This process of SAT dissolution followed by NAT crystallization and growth may offer a mechanism for the formation of type Ia polar stratospheric clouds on frozen sulfate aerosols when S NAT > 15.