大气气溶胶中碘形态研究进展

大气中的碘直接影响对流层中多种光化学反应并间接影响全球气候变化,因而碘的大气化学机制研究受到越来越多关注.气溶胶中的碘是其大气化学反应的最终产物,通过其赋存形态可以推测和了解碘的大气化学过程.大气碘化学理论一直认为IO3-是大气碘沉降中最主要的碘形态,但近年来的各地实测数据发现大气气溶胶中的碘形态大多以可溶性有机碘或I-为主.这种分歧说明目前的大气碘化学理论尚有待完善.本文详细介绍了近年来碘的大气化学以及气溶胶颗粒物中碘形态的研究进展.

Research Progress of Atmospheric Iodine Speciation in Aerosol

Iodine in the atmosphere directly influences on many kinds of photochemical reactions in troposphere, and indirectly poses impact on global climate change. It is thus that the research on the mechanism of atmospheric chemistry of iodine has attracted more and more attention. Iodine compounds in the aerosol are the final product of atmospheric chemistry reactions of iodine, which can be inferred and known via investigating the iodine speciation in aerosol. IO^-₃ is often considered to be the dominant form of iodine precipitation. But field measurement in recent years showed that soluble organic iodine or I^- were mostly the dominant forms in atmospheric aerosol. This implies that atmospheric chemistry mechanism of iodine still remain to perfect further. Here we focus on the research progress of atmospheric chemistry of iodine and its speciation in aerosols up to date.