In this study, the oxidation rates of sulfur dioxide （SO2） in sulphuric acid solution by ozone and oxygen were compared, and the oxidation mechanism of ozone on SO2 was investigated. The results showed that the oxid...In this study, the oxidation rates of sulfur dioxide （SO2） in sulphuric acid solution by ozone and oxygen were compared, and the oxidation mechanism of ozone on SO2 was investigated. The results showed that the oxidation-reduction potential of the acidic solution was enhanced, the transformation rate of sulfuric acid to sulphuric acid was increased and the absorption driving force was improved in the presence of ozone. By comparing the amount of sulfate ions measured in the experiments and the theoretical amount of sulfate ions calculated from the amount of ozone consumed in the reaction, it can be confirmed that oxygen free radicals from dissociation of ozone are reactive as an efficient oxidant and oxygen from ozone generator participates in the reaction with SO2. 0.602 mol of effective oxygen was introduced into the reaction by one mole of ozone in 10.15 rain at sulphuric acid concentration of 3% （by mass）, SO2 concentration of 1.33% （by volume） and oxygen flow rate of 1.5 L.min^-1 from ozone generator.展开更多
The aim of the study was to find the interrelations between the activity of intracellular dehydrogenases, abundance of microorganisms, and the level of soil DNA in the Mollic Gleysol profile, with notification on the ...The aim of the study was to find the interrelations between the activity of intracellular dehydrogenases, abundance of microorganisms, and the level of soil DNA in the Mollic Gleysol profile, with notification on the dominant DNA form （extra-or intra-cellular）, depending on the type of land use. Two neighbouring meadows were selected for investigations： one systematically cultivated and fertilized and the other deprived of any effect of anthropogenic activity, used as a control. We have demonstrated that dehydrogenase activity （DHA）, the DNA content and microbial abundance strongly depended on the type of land use. DHA exhibited a significant correlation with the DNA content （r = 0.99^＊＊＊ and r = 0.74^＊, for cultivated and control sites, respectively）. This relationship with such a high r value might suggest domination of the intracellular form of DNA in the cultivated meadow, which is also confirmed by the c.a. 13% increase in microorganism abundance in the cultivated soil. The optimal conditions for microbial activities were defined by the significant positive interrelationships between microbial abundance and the total organic carbon content, and a negative correlation with pH, redox potential and soil bulk density.展开更多
文摘In this study, the oxidation rates of sulfur dioxide （SO2） in sulphuric acid solution by ozone and oxygen were compared, and the oxidation mechanism of ozone on SO2 was investigated. The results showed that the oxidation-reduction potential of the acidic solution was enhanced, the transformation rate of sulfuric acid to sulphuric acid was increased and the absorption driving force was improved in the presence of ozone. By comparing the amount of sulfate ions measured in the experiments and the theoretical amount of sulfate ions calculated from the amount of ozone consumed in the reaction, it can be confirmed that oxygen free radicals from dissociation of ozone are reactive as an efficient oxidant and oxygen from ozone generator participates in the reaction with SO2. 0.602 mol of effective oxygen was introduced into the reaction by one mole of ozone in 10.15 rain at sulphuric acid concentration of 3% （by mass）, SO2 concentration of 1.33% （by volume） and oxygen flow rate of 1.5 L.min^-1 from ozone generator.
文摘The aim of the study was to find the interrelations between the activity of intracellular dehydrogenases, abundance of microorganisms, and the level of soil DNA in the Mollic Gleysol profile, with notification on the dominant DNA form （extra-or intra-cellular）, depending on the type of land use. Two neighbouring meadows were selected for investigations： one systematically cultivated and fertilized and the other deprived of any effect of anthropogenic activity, used as a control. We have demonstrated that dehydrogenase activity （DHA）, the DNA content and microbial abundance strongly depended on the type of land use. DHA exhibited a significant correlation with the DNA content （r = 0.99^＊＊＊ and r = 0.74^＊, for cultivated and control sites, respectively）. This relationship with such a high r value might suggest domination of the intracellular form of DNA in the cultivated meadow, which is also confirmed by the c.a. 13% increase in microorganism abundance in the cultivated soil. The optimal conditions for microbial activities were defined by the significant positive interrelationships between microbial abundance and the total organic carbon content, and a negative correlation with pH, redox potential and soil bulk density.
