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硫代硫酸铵.
硫代硫酸铵,分子式为(NH4)2S2O3,是硫代硫酸盐的一种。
一种有强烈吸湿性的白色斜方结晶,加热至150℃会分解成亚硫酸铵、硫黄、氨、硫化氢及水。极易溶于水,不溶于醇和醚,微溶于丙酮。在空气中不稳定,在氨气中稳定。
碳酸氢铵与二氧化硫和水作用产生亚硫酸铵,经过滤除去杂质后再与硫黄加热煮沸反应,再经过滤、蒸发、冷却结晶和离心分离,得到硫代硫酸铵成品。
![{\displaystyle {\rm {\ 2NH_{4}HCO_{3}+SO_{2}+H_{2}O\rightarrow (NH_{4})_{2}SO_{3}+2H_{2}O+2CO_{2}\uparrow ))}](https://wikimedia.org/api/rest_v1/media/math/render/svg/4f78c0d2819d938f975844afb421bfb6b2232216)
![{\displaystyle {\rm {\ (NH_{4})_{2}SO_{3}+S\rightarrow (NH_{4})_{2}S_{2}O_{3))))](https://wikimedia.org/api/rest_v1/media/math/render/svg/3eb8fc97bb8911557972276e8137e7a8e2478b73)
感光工业中用作照相定影剂,用于替代硫代硫酸钠,具有水洗时间短和银容易回收的优点,且较钠盐更易溶解卤化银的乳膜。在医药上用作杀菌剂、分析试剂。
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