ZHANG Fenglei1,2， ZHENG Xunyi1,2， CHEN Qiwei1,2, LUO Kai1,2 , WANG Jiabin1,2
（1. Chongqing Key Laboratory of Geological Survey of Land Quality, Chongqing 404100, China;
2. Chongqing Municipal Bureau of Geology and Mineral Exploration and Development, Chongqing 404100, China）
Abstract: This study is a health risk assessment of heavy metals in crops from area of high geological background of heavy metals and industrial suburb. We chose corn, rice, sweet potato, lotus root and grapefruit from modern agricultural demonstration zone of Liang ping County as the study object. And sampling areas were mainly affected by the high geological background of heavy metals or industrial activities. By comparing, we got the following understanding, 1) regardless of industrial area or geological background area, contents of As, Hg and Cd in rice are always higher than those in maize. Contents of Cu, Zn, and Ni in maize are always higher than those in rice. Rice and maize have different enrichment characteristics for different heavy metals; 2) the hazard quotient of crops is proportional to the concentration of heavy metals. The hazard quotient of As, Hg, Cd, Zn, and Ni in maize is higher than that in the high background area, due to the influence of industrial activities on the forms of heavy metals in soil; 3) the hazard quotient of grapefruit is generally low and the hazard quotient of As element of lotus root reaches 2.08 for high geological background area, with significant health risk; and 4) the contribution rate of heavy metal elements to the total hazard quotient shows that the contribution rate of As and Cu to the whole area is the highest. The contribution rate of Cd to geological background area is higher than that to industrial area. We should pay enough attention to the pollution of Cd on rice.
Keywords: heavy metal elements; geological background; health risks; Chongqing
EARTH AND ENVIRONMENT Vol.45, No.5, Tot No.319, 2017, Page 567-575
