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《Journal of Lake Sciences》 2013-02
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Eliminating flocculation in the pretreatment of lacustrine deposits for particle size analysis

HU Zongjie1,2,YAN Jiaxin1,2 & HAN Hongyin2(1: Faculty of Earth Sciences,China University of Geosciences,Wuhan 430074,P.R.China)(2: State Key Laboratory of Biogeology and Environmental Geology,China University of Geosciences,Wuhan 430074,P.R.China)  
Lake sediment should be pretreated before particle size analysis.It is necessary to eliminate the error caused by flocculation phenomenon of fine grain of sediment samples at the same time of effectively removing organic matter and carbonate particles.Surface sediment sample from the Lake Sanjiao in Wuhan was used for X-ray powder diffraction(XRD) to identify its mineral composition and clay species and automatic laser granulometer for grain size analysis.The XRD result demonstrated that the main non-clay minerals in sample were quartz and feldspar;while the clay minerals were primarily illite,kaolinite,chlorite.Furthermore,the result of grain size analysis showed that the grain size of 94.5% of component in sample was less than 30 μm.These characteristics made the sample easy to form flocculation at the pretreatment process of grain size analysis.Based on the results above,for the sample which are composited primarily with illite,kaolinite,chlorite,a single factor optimization method including ultrasonic concussion,dispersing agent and acid washing was used to check the optimum condition for eliminating flocculation.Results indicate that the optical condition for eliminating flocculation are ultrasonic concussion time: 6-8 min,dispersing agent concentration: 20 g/L,with acid washing before particle size analysis.
【Fund】: 国家自然科学基金项目(41072078);; 武汉新区六湖水系网络工程三角湖与北太子湖底质水质特征分析项目(2009316236)联合资助
【CateGory Index】: P343.3
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