nitrite reagent

例句：

1. 1.This nitrite reagent is used to detect the presence of nitrate in water samples.
   这种亚硝酸盐试剂用于检测水样中的硝酸盐。
2. 2.The chemical reaction between nitrite and sulfur dioxide produces a yellow color change.
   亚硝酸和二氧化硫之间的化学反应会产生黄色的颜色变化。
3. 3. In the laboratory, nitrite reagent is often used to test for the presence of nitrate in soil samples.
   在实验室中，亚硝酸盐试剂常用于测试土壤样品中是否存在硝酸盐。