The quantitative token of the residual age index of DDT in soils was primarily discussed,and the normalized residual time index(NRTI) of DDT was designed as one of the methods.

• 初步探讨了土壤中DDT残留时间的定量表征,设计出归一化的DDT残留时间指数(NRTI)作为定量表征土壤DDT残留时间的方法之一。