Spatial distribution, sources and health risks of heavy metals in soil in Qingcheng District, Qingyuan City: Comparison of PCA and PMF model results
NING Wenjing, XIE Xianming, YAN Liping
Earth Science Frontiers . 2023, (4): 470 -484 .  DOI: 10.13745/j.esf.sf.2023.2.46