differential polarography

例句：

1. 1.The differential polarographic method was used to analyze the chemical composition of the sample.
   使用差分极谱法分析了样品的化学成分。
2. 2.The researcher developed a new technique for differential polarography that could detect trace amounts of pollutants.
   研究者开发了一种新方法，用于差分极谱分析，可以检测到微量污染物。
3. 3.In this study, we applied the differential polarographic method to determine the concentration of heavy metals in soil samples.
   在本研究中，我们应用差分极谱法测定土壤样本中重金属的浓度。