珠江三角洲土壤镉高含量区的化学形态特征

珠江三角洲冲积平原区存在镉的高含量区, 其主要分布于第四纪海陆和陆海交互相。第四纪不同沉积相镉的全量和不稳定相态的含量特征也存在显著的差异, 海陆交互相、陆海交互相、陆相的全量和不稳定相态的含量呈逐渐降低的趋势。从地表至深部, 在地下水位附近不稳定相态的含量比例相对较大。

CHEMICAL CHARACTERISTICS OF SOIL Cd-HIGH AREAS IN ZHUJIANG DELTA

There exist Cd-high areas in alluvial plain of Zhujiang delta, which are distributed in Quaternary marine - continental and continental-marine alternating facies sediments. The characteristics of total Cd content and unstable Cd phase content are obviously different in different sedimentary facies. The total Cd content and unstable Cd phase content tend to decrease gradually from marine-continental alternating facies through continental-marine alternating facies to continental facies. From the surface to the depth, the content ratio of unstable Cd phase is relatively high near the underground water level.