大沽排污河底泥基本特征

大沽排污河底泥污染严重,为了解底泥的特征,研究了大沽排污河底泥的理化性质.结果为:大沽排污河底泥的平均含水量为34.4%,平均pH值为6.8,全河段TOC平均值约为8%;Malven Mastersizer激光粒度仪测定了大沽排污河悬浮物和沉积物的粒径分布,结果表明主要以粉砂为主、占60%左右,其次为黏土、占30%左右,大沽排污河底泥颗粒属于细颗粒;X-射线衍射分析底泥的矿物主要由轻矿物和粘土矿物组成,轻矿物主要为石英、伊利石和方解石,粘土矿物主要由伊利石、绿泥石、蒙托石、高岭石组成;石英和伊利石是大沽排污河底泥悬浮物及沉积物矿物的主要成分,两者之和分别为75.5%和62.2%.

Characteristics of sediments from Dagu Drainage River

Sediments from Dagu Drainage River(DDR) were polluted seriously.The physicochemical properties of sediments from DDR were studied to obtain characteristics of sediments.The results were that average water content of sediments from DDR was 34.4%,average pH was 6.8 and average TOC of sediments was 8%.The particle sizes of both suspended sediment and bottom sediment were mensurated by Malven Mastersizer.Silt accounts for about 60% in mass,while clay is about 10%.Particles of sediments belong to fine granule.The main minerals of sediments mensurated by X-ray Diffraction(XRD) were light minerals and clay minerals.Light minerals were made up of quartz,albite and calcite and clay minerals were made up of illite,chlorite,montmorillonite and kaolinite.Suspended sediment and bottom sediment mainly consisted of quartz and illite,both account for 75.5% and 62.2%.