英语翻译This is achieved by separating the ammonium source medium B,from the buffer,medium A ,and by adding a constant volume of medium A,but differing appropriate amounts of medium B and of water.其中：medium B 是硫酸铵溶液,也就是指

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英语翻译This is achieved by separating the ammonium source medium B,from the buffer,medium A ,and by adding a constant volume of medium A,but differing appropriate amounts of medium B and of water.其中：medium B 是硫酸铵溶液,也就是指
英语翻译
This is achieved by separating the ammonium source medium B,from the buffer,medium A ,and by adding a constant volume of medium A,but differing appropriate amounts of medium B and of water.
其中：medium B 是硫酸铵溶液,也就是指ammonium source 铵源；
medium A 是碳酸氢钠溶液.
前文在说“应将水样中的氨氮浓度调整到相同水平.”
我对这句话完全无法理解,至少帮我理解下这是在教怎么做.
我需要的不是每个词的意思，是想要知道如何理解这句话。
P.S.这是 ISO 9509 中的一段话，这貌似是调配废水中氨氮浓度的一个方法。

英语翻译This is achieved by separating the ammonium source medium B,from the buffer,medium A ,and by adding a constant volume of medium A,but differing appropriate amounts of medium B and of water.其中：medium B 是硫酸铵溶液,也就是指
我翻译成能够读懂的汉语顺序,翻译如下：
这是通过如下方式获得的：
在一定容量的碳酸氢钠溶液中加入不同剂量的硫酸铵溶液和水,从而在缓冲剂碳酸氢钠溶液中分离出铵源——硫酸铵溶液来.

是由分离铵,从源头介质缓冲、添加一个常数体积,但不是同介质中B和适量的水

这通过从缓冲液A中分离出铵源B，并添加一定量适当浓度的A溶液来实现。
大概就是从现有的溶液中取出适量部分，再添加适量的B和水，来使水样中氨氮浓度调整到相同水平。

这是由分离铵,从源头介质缓冲、添加一个常数,体积,但是不同介质中B和适量的水。

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