USE OF SONIC-CHEMICAL DIGESTION OF ENVIRONMENTAL WATER SAMPLES FOR COD DETERMINATION
A study on the fabrication of a simple, safety and closed sonic chemical digestor is described, and used for the digestion of different environmental water samples. The influences of various factors, e.g. the sonic frequency, sonic intensity of digestants and temperature etc, to the determination of COD were studied, and optimun conditions were established. As compared with the conventional K 2Cr 2O 7 H 2SO 4 refluxing digestion method, the present method showed a much higher speed of digestion, and used less or no digestant. The suitable concentration range for the determination of COD is found to be 150~2000mg·L -1 . RSD′s were found to be ≤6.5% and the recoveries were in the range of 96%~120%.
Abstract To quantify the risk and impact of CO2 seepage to the marine ecosystem, the Quantifying and Monitoring Potential Ecosystem Impacts of Geological Carbon Storage project is now undergoing in a bay in Scotland. In advance of the field experiment of this project, we conducted the numerical simulation of CO2 seepage. From this numerical study, we predicted how CO2 behave in the bay and how the condition of the sea changes.