For this question, our answer is following: this data is from the Technical Guidelines for Soil Pollution Risk Assessment of Construction Land in China. The website address of the guidelines is https://www.mee.gov.cn/ywgz/fgbz/bz/bzwb/trhj/201912/W020191224560850148092.pdf
Point 1、This study estimated the heavy metal exposure to children through soil and dust Ingestion in electronic waste (e-waste) dismantling areas.