Method for detecting slit content in soil of protective layer

The invention discloses a method for detecting slit content in soil of a protective layer, and belongs to the technical field of soil detection. The method comprises the following steps of collectinga soil sample to be detected of a first preset capacity and placing the soil sample in a digestion device; adding nitric acid and perchloric acid for digestion under a first preset condition to obtaina solution to be detected; steaming the solution to be detected to dryness under a second preset condition; adding a second preset capacity of 15 wt% hydrochloric acid, heating for 6 to 9 minutes, and obtaining a standard solution after volume formation; detecting an absorbance value corresponding to the river slit in the standard solution by flame atomic absorption spectrometry; obtaining the content of river slit in the soil sample to be detected according to the absorbance value; calculating the ratio of the content of the river slit and the content of the soil sample to be detected, and comparing with the standard