<p><b>硫代硫酸銨</b>，分子式為(NH<sub>4</sub>)<sub>2</sub>S<sub>2</sub>O<sub>3</sub>，是硫代硫酸鹽的一種。
</p>
<h2><span id=".E6.80.A7.E8.B4.A8"></span><span id="性质">性質</span></h2>
<p>一種有強烈吸濕性的白色斜方結晶，加熱至150℃會分解成亞硫酸銨、硫黃、氨、硫化氫及水。極易溶於水，不溶於醇和醚，微溶於丙酮。在空氣中不穩定，在氨氣中穩定。
</p>
<h2><span id=".E5.88.B6.E6.B3.95"></span><span id="制法">製法</span></h2>
<p>碳酸氫銨與二氧化硫和水作用產生亞硫酸銨，經過濾除去雜質後再與硫黃加熱煮沸反應，再經過濾、蒸發、冷卻結晶和離心分離，得到硫代硫酸銨成品。
</p>
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  </semantics></math></span></span></dd></dl><h2><span id=".E7.94.A8.E9.80.94"></span><span id="用途">用途</span></h2>
<p>感光工業中用作照相定影劑，用於替代硫代硫酸鈉，具有水洗時間短和銀容易回收的優點，且較鈉鹽更易溶解鹵化銀的乳膜。在醫藥上用作殺菌劑、分析試劑。
</p>
**硫代硫酸銨**，分子式為 (NH4)2S2O3，是硫代硫酸鹽的一種。

## 性質

一種有強烈吸濕性的白色斜方結晶，加熱至 150℃會分解成亞硫酸銨、硫黃、氨、硫化氫及水。極易溶於水，不溶於醇和醚，微溶於丙酮。在空氣中不穩定，在氨氣中穩定。

## 製法

碳酸氫銨與二氧化硫和水作用產生亞硫酸銨，經過濾除去雜質後再與硫黃加熱煮沸反應，再經過濾、蒸發、冷卻結晶和離心分離，得到硫代硫酸銨成品。

　
: ${\rm {\ 2NH_{4}HCO_{3}+SO_{2}+H_{2}O\rightarrow (NH_{4})_{2}SO_{3}+2H_{2}O+2CO_{2}\uparrow }}$

　
: ${\rm {\ (NH_{4})_{2}SO_{3}+S\rightarrow (NH_{4})_{2}S_{2}O_{3}}}$

## 用途

感光工業中用作照相定影劑，用於替代硫代硫酸鈉，具有水洗時間短和銀容易回收的優點，且較鈉鹽更易溶解鹵化銀的乳膜。在醫藥上用作殺菌劑、分析試劑。
(NH4)2S2O3