iodine coulometer

例句：

1. 1. The iodine coulometer was used to measure the concentration of iodine in water samples.
   碘量计被用来测量水样中碘的浓度。
2. 2. The iodine coulometer was used to determine the amount of iodine in the sample.
   碘量计被用来确定样品中的碘含量。
3. 3. The iodine coulometer was used to test the purity of the iodine solution.
   碘量计被用来测试碘溶液的纯度。