Ran Ma

Rapid Determination of Organic Matter Fractions by Ozonation Chemiluminescence

Understanding marine biogeochemistry requires a network of global ocean in situ monitoring of various parameters on different scales in time and space. Among the various parameters involved in marine biogeochemistry, sediment chemistry is most important, and the organic matter fractions are the dominate factor in this parameter. However, classical methods of determining organic matter fractions consume a great deal of time and labor. In addition, some of these methods can produce high levels of pollution and are therefore not suitable for in situ studies. This study explored a method of rapid determination of organic matter fractions by ozonation chemiluminescence. In this method, the organic matter was separated into extractives, acid soluble fractions and acid insoluble fractions (AIF) using the classical method and then oxidized by ozone. The ozonation chemiluminescence characteristics of eight samples were subsequently used to set up a model to predict the concentrations of organic matter fractions. The model was tested using nine other organic samples and the results showed that it provided a better fit for the predicted acid soluble fractions. This study is the first to demonstrate the use of ozonation chemiluminescence for rapid determination of organic matter fractions; however, further study is required to enable its universal use.

Design of Ocean Surveillance Multifunctional Data Acquisition Processor

It is a very important content for the design and development of automatic ocean surveillance system to make the data acquisition, storage, processing and transmission of ocean surveillance effective. The thesis puts forward a special design method and plan of ocean surveillance multifunctional data acquisition process equipment in detail which provides a great deal of signal patterns such as, analog quantity, digital quantity, pulsed quantity, serial port signal for the ocean surveillance information automatic collection and huge information storage, providing linear communication and remote communication data transmission mode the ocean surveillance tasks probably take application, and also provides the display, analysis, query and processing functions of collected information. The equipment is designed as a simple setup that can be flexibly applied to all kinds of ocean surveillance tasks, which illustrates a good prospect of application and extension

Quantifying the Process of Ozonation Chemiluminescence on Determining Organic Matter Compositions

Although the ozonation chemiluminescence can be used to determine organic matter fractions (lipids, acid soluble fractions, acid insoluble fractions), the process is not clear, e.g., what is produced after the organic matter is oxidized by ozone (O3), how much product and reactant are in the ozonation, how to define the complete oxidation Aimed at resolving these questions, we designed an experiment. On the special equipment developed for the ozonation chemiluminescence studies, two instruments of determining O3 concentrations and two flowmeters were installed to measure the input and output amount of O3 and the amount of O3 consumed can be calculated. Results showed that 1) acid insoluble fractions are oxidized to lipids and acid insoluble fractions; 2) the amount of the product is determined by the amount of reactant and consumed O3 ( ); 3) when the reactant is as result 2), the oxidation is complete, or when the organic matter fractions are stable after ozonation, the oxidation is complete. Further study should test the process at the molecular level.