Zhang H H, Yuan H X, Hu Y G, Wu Z F, Zhu L A, Zhu L, Li F B, Li D Q
Guangdong Institute of Eco-Environmental and Soil Sciences, Guangzhou, 510650, China.
Environ Pollut. 2006 Nov;144(2):492-9. doi: 10.1016/j.envpol.2006.01.029. Epub 2006 Mar 24.
Total of 260 soil profiles were reported to investigate the arsenic spatial distribution and vertical variation in Guangdong province. The arsenic concentration followed an approximately lognormal distribution. The arsenic geometric mean concentration of 10.4 mg/kg is higher than that of China. An upper baseline concentration of 23.4 mg/kg was estimated for surface soils. The influence of soil properties on arsenic concentration was not important. Arsenic spatial distributions presented similar patterns that high arsenic concentration mainly located in limestone, and sandshale areas, indicating that soil arsenic distribution was dependent on bedrock properties than anthropogenic inputs. Moreover, from A- to C-horizon arsenic geometric mean concentrations had an increasing tendency of 10.4, 10.7 to 11.3 mg/kg. This vertical variation may be related to the lower soil organic matter and soil degradation and erosion. Consequently, the soil arsenic export into surface and groundwaters would reach 1040 t year-1 in the study area.
共报道了260个土壤剖面，以研究广东省砷的空间分布和垂直变化。砷浓度近似呈对数正态分布。砷的几何平均浓度为10.4毫克/千克，高于中国的平均水平。估计表层土壤的上限基线浓度为23.4毫克/千克。土壤性质对砷浓度的影响并不显著。砷的空间分布呈现出相似的模式，即高砷浓度主要位于石灰岩和砂页岩地区，这表明土壤砷的分布更多地取决于基岩性质而非人为输入。此外，从A层到C层，砷的几何平均浓度有增加的趋势，分别为10.4、10.7和11.3毫克/千克。这种垂直变化可能与土壤有机质含量较低以及土壤退化和侵蚀有关。因此，研究区域内土壤砷向地表水和地下水的输出量将达到每年1040吨。
