Element distribution characteristics of Cd-rich soils and their pollution remediation test in the lower reaches of the Yangtze River

Abstract：A large tract of Cd-rich soils is found along the lower reaches of the Yangtze River in Jiangsu and the Cd content in vegetable samples is found to be in excess of standards in some areas. Based on a preliminary analysis of the element geochemical characteristics of Cd-rich soils in the study area, the authors discuss the main cause for the local Cd pollution in soils and systematically introduce the main research data and results of heavy metal-polluted soil remediation and control tests performed in vegetable lands polluted by Cd in Baguazhou, Nanjing. It is found that the Cd concentration within vegetable can be significantly reduced by applying an appropriate quantity of fixation agents such as calcium-magnesium phosphate (Ca, Mg)3(PO4)2 fertilizers. This study provides a new idea for safe vegetable production in areas of relatively Cd-rich soils in the lower reaches of the Yangtze River.