【摘 要】
：
The chemical fractions,i.e.,water soluble (WS),exchangeable (Ex),carbonate (Car),weakly organic (WO),Fe-Mn oxide (FMO),strongly organic (SO),residual (Res) trac
【机 构】
：
Institute of Hydrogeology and Environmental Geology
论文部分内容阅读
The chemical fractions,i.e.,water soluble (WS),exchangeable (Ex),carbonate (Car),weakly organic (WO),Fe-Mn oxide (FMO),strongly organic (SO),residual (Res) traction,of Pb in irrigated soils in South China were investigated by a modified Tessier sequential extraction technique.The results show that the chemical fraction of Pb in soil is mainly the Res fraction and followed by FMO fraction,and the WS,WO,FMO,and SO fractions in topsoils (0-10 cm) are higher than those in subsoils (30-40 cm).The sum of contents of WS and Ex fractions (SWE) in topsoils is significantly positively related with that in subsoils,indicating the strong mobility of Pb in WS and Ex fractions in soils,and the SWE in 6oils is higher than the German trigger value for the transfer path soil-plant,indicating the high bioavailability of Pb in soils of this area.Fortunately,SWE and the ratio of WS and Ex fractions (RwE)to the sum of all firactions generally decrease with the soil depth in soil profile and the RWE in soil profile is lower than 0.5％,indicating the low pollution risk for Pb in groundwater.In addition,soil particles,pH and.Fe2O3 play an important role in the impact of mobility and chemical fractions of Pb in soils.
其他文献
实践教学是培养高素质专门人才的关键环节。在“石油地质学”精品课程建设中通过重视实验教学、加强习题教学、增设石油地质综合训练等实践教学环节,使学生得到综合实践的训
钛铁合金(即钛钢),钛在很多金属元素中其原子量较少,倒居第八位,又有很强的耐腐蚀性,是制造特殊合金不可缺少的。其优良性应用于:.航空,航天,航海等工业中,目前需求旺盛,货源
Using correlation analyses,composite analyses,and singular value decomposition,the relationship between the atmospheric cold source over the eastern Tibetan Pla
With correlation analysis and factor analysis methods,the effects of preceding Pacific SSTs on subtropical high indexes of main raining seasons are discussed. T
To explore the stabilization effect of stabilizing agent GX07 on treating organic soil and the influence of organic matter on the strength development of stabil
Computerized tomography (CT) based on the convolution back projection method has been regarded as an important reconstruction method, but it is not suitable to
In order to investigate the tensile bond anchorage properties of Australian 500N steel bars in concrete,111 pullout tests were conducted.The precise bond slip v
发展了静拉伸复合材料接头层合板三维逐渐损伤模型,考虑了单层复合材料在材料1-2面及3-1面上具有明显非线性剪切应力-应变关系的叠层非线性效应,结合有限元技术即应力分析、
该文针对发散冷却中由于结构本身的缺陷或者是局部大热流而引起的传热恶化问题,通过对烧结多孔壁面发散冷却过程进行数值模拟,对孔隙及热流的非均匀性对发散冷却壁面温度分布
在灌溉季节,尤其是下游灌区,农田地下水位较高,作物可就地利用部分浅层地下水,从而减少灌溉需水量,达到节水减排的双重目的.大田作物对浅层地下水利用量的估算是合理制定灌溉