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ammonium [noun]
ammonium 通常作不可数名词；作定语修饰化合物名称时，中文常译为“铵”或使用化合物惯用名。
Ammonium nitrate is a common fertilizer.
硝酸铵是一种常用肥料。
铵
先理解核心含义，再看它在真实句子里的用法。
铵
The ion NH4+, derived from ammonia, which behaves in many respects like an alkali metal ion.
Ammonium nitrate is a common fertilizer.
硝酸铵是一种常用肥料。
一价阳离子NH4+,由氨质子化衍生而来
The univalent NH4+ cation, derived by the protonation of ammonia
由氨衍生的NH4离子；在许多方面表现得像碱金属离子
the ion NH4 derived from ammonia; behaves in many respects like an alkali metal ion
The label says this cleaner contains ammonium, so wear gloves when using it.
标签上说这种清洁剂含有铵，所以使用时请戴手套。
Ammonium is often added to soil to help plants get enough nitrogen.
铵经常被加入土壤中，帮助植物获得足够的氮。
Workers test the water for ammonium before releasing it into the river.
工人们在将水排入河流之前会检测水中的铵。
ammonium 通常作不可数名词；作定语修饰化合物名称时，中文常译为“铵”或使用化合物惯用名。
Ammonium nitrate is a common fertilizer.
硝酸铵是一种常用肥料。
指特定离子时常用定冠词 the。
The ammonium ion forms when ammonia dissolves in water.
氨溶于水时形成铵离子。
The level of ammonium in the soil affects plant growth.
土壤中的铵含量影响植物生长。
Not this
Ammonia nitrate is a common fertilizer.
Use this
Ammonium nitrate is a common fertilizer.
这里把 ammonia（氨，NH3）和 ammonium（铵离子，NH4+）混用了。表示铵盐时应使用 ammonium，所以应为 ammonium nitrate。
Not this
The lab uses chloride ammonium.
Use this
The lab uses ammonium chloride.
中文盐名习惯按“阴离子+阳离子”的顺序说（氯化铵），但英文盐名通常把阳离子放在前面，因此要说 ammonium chloride。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
硝酸铵
Ammonium nitrate is widely used as a fertilizer.
硝酸铵广泛用作肥料。
硫酸铵
Farmers applied ammonium sulfate to improve the soil.
农民施用硫酸铵改良土壤。
氯化铵
Ammonium chloride is used in some cough medicines.
氯化铵用于某些止咳药中。
季铵
Quaternary ammonium compounds are common disinfectants.
季铵化合物是常见的消毒剂。
氢氧化铵
Ammonium hydroxide is a weak base used in cleaning products.
氢氧化铵是一种弱碱，用于清洁产品。
磷酸铵
Ammonium phosphate provides both nitrogen and phosphorus to plants.
磷酸铵为植物提供氮和磷。
Use ammonium naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
谐音联想『阿摩尼厄姆』：氨（ammonia）带上正电变成铵离子 NH4+，就像金属离子一样。
语域：formal 常见场景：化学教材、实验报告、科学文献 铵通常用于化学和科学语境，比较正式；日常口语中较少单独使用，多出现在教材、实验报告或专业文献中。
复数形式为 ammoniums。
Dictionary facts from ECDICT, WIKTIONARY.