Griess reagent

例句：

1. 1.The chemical analysis used a Griess reagent to detect the presence of nitrite in the sample.
   化学分析中使用了格氏试剂来检测样本中硝酸盐的存在。
2. 2.The scientist mixed the Griess reagent with the sample and observed a color change.
   科学家将格氏试剂与样本混合，并观察到颜色变化。
3. 3.The experiment was designed to test the effectiveness of the Griess reagent in detecting pollutants in water samples.
   实验旨在测试格氏试剂在检测水样污染物中的有效性。