LEI Yun-yi1, WANG Fu-shun2, LU Dan-ping1, MEI Hang-yuan2, YIN Ran2
（1. Department of Chemistry, Shanghai University, Shanghai 200444, China；
2. College of Environment and Chemical Engineering, Shanghai University, Shanghai 200444,China）
Abstract：In this study, biogenic Silica in sediments of reservoirs in the Wujiang Drainage Basin was determined, by means of the wet-alkaline extraction procedure with the combination of single-point and multi-point extraction methods. The multi-point extraction procedure was improved in this study. A batch of sediment samples were put into centrifuge tubes, and continuously vibrated in a constant temperature bath oscillator. Contents of biogenic silica (BSi) of the extracted samples were measured every hour through wet-alkaline extraction procedure. The optimum extraction condition was obtained with the linear regression method. Samples were then extracted with the single-point extraction method under the optimum condition, and the content of BSi was measured with silicon-molybdenum blue method. This method had rapid speed of single point extraction in determining BSi, and also reduced the volume errors from multi-point method. In this paper, variation of biogenic silica content of reservoir sediments in the Wujiang Drainage Basin, and their environmental implications were also discussed.
Key words: Sediment; biogenic silica; the Wujiang Drainage Basin; reservoir
E-mail: leiyylrh@sohu.com
ACTA MINERALOGICA SINICA Vol. 31, No. 1, 2011, Page 30-35
