coulometer

例句：

1. 1. The coulometer was used to measure the concentration of a solution.
   电化学滴定仪被用来测量溶液的浓度。
2. 2. The coulometer was used to determine the pH of the solution.
   电化学滴定仪被用来测定溶液的pH值。
3. 3. The coulometer was used to analyze the chemical composition of the sample.
   电化学滴定仪被用来分析样品的化学成分。