有潮解性。微溶于水或碱溶液；不溶于醇。在空气中加热缓慢氧化。460-470℃分解。溶液呈碱性。有毒。有刺激性。用于配制1%亚碲酸钾无菌过滤溶液，选择性分离葡萄球菌和棒状（杆）菌。添加剂。或血浆或疫苗中病理性细菌试验。医学上用于培养诊断白喉菌。

Potassium tellurite is a hygroscopic granular white powder. It decomposes at 460-470℃.
Potassium tellurite along with agar may be used as a component of a selective medium for growth of bacteria.

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