benzidine reagent

例句：

1. 1. The benzidine reagent is used to detect the presence of amines in samples.
   苯二胺试剂用于检测样本中的胺类物质。
2. 2.The benzidine reagent was found to be highly sensitive and selective for the detection of phenols.
   苯二胺试剂被发现对酚类的检测具有高度的敏感性和选择性。
3. 3. The benzidine reagent was used to stain the sample for further analysis.
   苯二胺试剂被用来染色样品以便进一步分析。