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为了给土壤重金属污染提供定量依据,该文在缓变型地球化学灾害基本模型的基础上,基于土壤中Zn元素含量实测数据,分别研究了合肥大兴镇地区和义城镇地区土壤中Zn元素的缓变型地球化学灾害特征并进行了对比,确定其数学模型。研究结果显示,大兴镇地区土壤中Zn元素有从可释放态向有效态(TRCPZn→ZnE+C)释放转化的趋势,其缓变型地球化学灾害临界值为70.333 mg∕kg,约22.6%面积的土壤具有爆发Zn元素缓变型地球化学灾害的可能性。而义城镇地区土壤中Zn元素还不具有爆发缓变型地球化学灾害的可能性。
In order to provide a quantitative basis for heavy metal pollution of soils, based on the basic model of slow geochemical disasters and on the basis of the measured data of Zn content in soil, we studied the slowly changing forms of Zn in soils of Daxing and Hecheng Geochemical disaster characteristics and compared to determine its mathematical model. The results showed that Zn in the soil of Daxing town tended to be released and released from TRCPZn → ZnE + C, and the critical value of slow-acting geochemical disaster was 70.333 mg / kg and about 22.6% of the area Soil has the potential of a gradual onset of elemental Zn geochemical disasters. However, Zn in the soils of Yicheng Township does not yet have the possibility of geochemical disasters of slowly changing type.