By measuring the concentration of air anions, thermal-temperature, tree-coverage and bio-diversity in major city greenbelt in Shanghai, this paper analyzed thecorrelativity between air cleaning index and its influenti...By measuring the concentration of air anions, thermal-temperature, tree-coverage and bio-diversity in major city greenbelt in Shanghai, this paper analyzed thecorrelativity between air cleaning index and its influential factorsof thesecity greenbelt, and found that less than 60% of parks’ concentration of air inions anions arrived at the general level. There is negative correlation between CI(air clean index) and thermal- temperature, and there is negative correlation between CIand bio-diversity too. Thereis Positivecorrelation between CI and tree-coverage.展开更多
The application of non-suppressed ion chromatography for monitoring of trace elements in air particulate matter was studied in the present investigation. The results indicate that the use of microwave acid digestion m...The application of non-suppressed ion chromatography for monitoring of trace elements in air particulate matter was studied in the present investigation. The results indicate that the use of microwave acid digestion method is superior in comparison with the conventional thermal acid digestion method as it leads to higher recovery, better reproducibility, lower volatility loss, better protection against environmental contamination and much less digestion time (5 minutes vs. 24 hours). The use of eluent as extractant is shown to reduce the water dip problem in the chro-matogram. The addition of chelating agent in the eluent coupled with UV detection is shown to provide satisfactory chromatographic separation and good sensitivity for the analysis of transition metals present in the air particulate matter. Using the U.S. National Bureau of Standards Reference Material 1648 Urban Particulate Matter as standard for checking, the analytical procedure is shown to give good recovery and reproducibility for the detection of the following cations and anions in air particulate matter: Fe2 Cu, Mn, Pb, Zn, Mg, Na, HN4+, Cl-, NO3- and SO42-. Field test was also performed to check the applicability of the method and the results obtained were discussed in the present paper.展开更多
文摘By measuring the concentration of air anions, thermal-temperature, tree-coverage and bio-diversity in major city greenbelt in Shanghai, this paper analyzed thecorrelativity between air cleaning index and its influential factorsof thesecity greenbelt, and found that less than 60% of parks’ concentration of air inions anions arrived at the general level. There is negative correlation between CI(air clean index) and thermal- temperature, and there is negative correlation between CIand bio-diversity too. Thereis Positivecorrelation between CI and tree-coverage.
文摘The application of non-suppressed ion chromatography for monitoring of trace elements in air particulate matter was studied in the present investigation. The results indicate that the use of microwave acid digestion method is superior in comparison with the conventional thermal acid digestion method as it leads to higher recovery, better reproducibility, lower volatility loss, better protection against environmental contamination and much less digestion time (5 minutes vs. 24 hours). The use of eluent as extractant is shown to reduce the water dip problem in the chro-matogram. The addition of chelating agent in the eluent coupled with UV detection is shown to provide satisfactory chromatographic separation and good sensitivity for the analysis of transition metals present in the air particulate matter. Using the U.S. National Bureau of Standards Reference Material 1648 Urban Particulate Matter as standard for checking, the analytical procedure is shown to give good recovery and reproducibility for the detection of the following cations and anions in air particulate matter: Fe2 Cu, Mn, Pb, Zn, Mg, Na, HN4+, Cl-, NO3- and SO42-. Field test was also performed to check the applicability of the method and the results obtained were discussed in the present paper.
