摘要
黑土样品采自于黑龙江海伦市,提取胶体并对其主要理化性质进行定性定量表征,通过淋滤实验研究胶体在土柱中的运移特征以及不同离子及其强度对胶体运移的影响。结果显示：所提取胶体粒径与理论计算基本吻合,粒径主要分布在2-5μm;当pH由4上升到9时,胶体的zeta电位则由-26.43mV降低到-34.52mV;红外光谱显示胶体颗粒的有机机团主要为-OH、CH-、C=O、多糖;X射线衍射表明其主要矿物组成是石英（56.9%）。不同离子及其强度对胶体的在土壤中的运移有较为明显的影响,当pH由4增加到9时,k值由6.020×10^-4降低至3.858×10^-4,Ca2＋、K＋、Na＋当离子强度由0.5mmol/L变化到0.001mmol/L时,k值分别由6.087×10^-4降低至4.024×10^-4、5.518×10^-4降低至3.818×10^-4、5.401×10^-4降低至4.109×10^-4。
Black soil samples were collected from Hailun,Heilongjiang Province,and colloids were extracted from the samples and their main physical and chemical properties were characterized qualitatively and quantitatively.Through leaching experiments,the migration characteristics of the colloids in the soil column,the influence of ions and their strength were studied. The results showed that the extracted colloidal particle sizes are consistent with the calculated ones,mainly within the range of 2μm to 5μm.When the pH increased from 4to 9,the zeta potential of the colloids would be reduced to-34.52mV from-26.43mV.Fourier transform infrared spectroscopy（FTIR）data showed that the colloidal particles mainly consist of-OH, CH-,C=O,and polysaccharide organic groups.X-ray diffraction analysis indicated that the main mineral composition is quartz（56.9%）.The ions and their strength have a more significant impact on colloid transport in soils.When the pH increased from 4to 9,the k values would be correspondingly reduced to 3.858×10^- 4from 6.020×10^-4.When the ionic strength of Ca^2＋,K^＋and Na^＋changes to 0.001mmol/L from 0.5mmol/L,the k values would be reduced from 6.087×10^4- to 4.024×10^-4,from 5.518×10^4- to 3.818×10^-4,and from 5.401×10^-4 to 4.109×10^-4,respectively.
出处
《地球与环境》
CAS
CSCD
北大核心
2014年第3期333-339,共7页
Earth and Environment
基金
国家自然科学基金面上项目(41373125)
