基于生态地球化学调查的广东省普宁市土壤地球化学环境预警

通过基于元素形态的缓变型地球化学灾害模型和基于元素全量的多重分形对广东省普宁市表层土壤有毒有害元素含量及分布进行研究,结果表明,普宁的有毒有害元素As、Cd、Pb、Cu、Ni、Zn具有缓变型地球化学灾害特征,其地球化学灾害爆发临界点分别为2.86、81.48、41.44、10.17、5.42和0.69mg/kg。60%土壤样品的Cu、35%土壤样品的Cd和Pb的可释放总量超过临界值,上述元素在研究区有产生地球化学灾害的潜力;As元素服从高浓集的连续多重分形叠加模式,说明受人类活动影响强烈,Cu具有较小的分维数,说明低值区域向高值区域转变慢,有较多高值区域分布。综合缓变型地球化学灾害评价和多重分析,表明普宁市有毒有害元素在未来有加剧污染的可能性。

Eco-geochemical Forecast of Puning Soil Environmental Based on Ecological Geochemistry Surveys

Based on delayed geochemical hazard model and multi-fractal model,element speciation and total elements of heavy metals in topsoil from Puning City, Guangdong Province, China were studied. We derived that the feature of As, Cd, Pb, Cu, Ni, and Zn is consistent with the delayed geochemical hazards model. The corresponding critical value of them are 2.86, 81.48, 41.44, 10.17, 5.42 and 0.69 mg/kg, respectively. Sixty percent of total releasable content of Cu and 35 percent of total releasable content of Cd and Pb exceed the critical value. Results show that the transformation of TRCP to available form may accelerate and produce geochemical hazard. Based on high concentration continuous multifractal model, Hg and Pb are strongly influenced by human activities. The Cu has minor fractal dimension, slowing transformation of low content level to high content level, indicating that the pollution trend of Cu is strengthened. Heavy metal pollution related to dismantling household appliance may become worse.