Di-n-amyl-o-phthalate is selected as an internal standard, which is added into the soil samples before shaking in this experiment.

• 文章利用内标法进行土壤中乙草胺测定的气相色谱法。以邻苯二甲酸二正戊酯为内标并于土壤样品振荡提取前加入。