Migration Characteristics and Environmental Quality Assessment of Heavy Metal Elements in the Rock-Soil System in Qiongzhong, Hainan Island

The rock-soil system is an important component of the Earth’s critical zone, but there are few detailed studies on different soil systems in Hainan Island. To clarify migration characteristics and environmental quality, three typical adamellite soil profiles and 7115 topsoil samples were collected from Qiongzhong, Hainan Island. The heavy metals Cu, Pb, Zn, Cr, Ni, Cd, As and Hg in rocks and soils were determined by ICP-MS/OES or AFS. Comprehensive evaluation shows that although heavy metal elements in the rock-soil system of the Qiongzhong research area exhibit diverse migration patterns and enrichment or deficiency characteristics, the overall environmental quality of the topsoil is relatively clean, with weak ecological risks. Different evaluation criteria and methods will lead to different evaluation results. It is suggested that a variety of evaluation methods and standards are adopted to carry out comprehensive evaluation in order to obtain more real, objective, and accurate evaluation results. The BRIEF REPORT is available for this paper at http://www.ykcs.ac.cn/en/article/doi/10.15898/j.ykcs.202308040122.