Samples of suspended particulate matters(SPMs),surface sediment and road dust were collected from the Yangtze estuarine and nearby coastal areas,coastal rivers,and central Shanghai.The samples were analyzed for the presence of 16 polycyclic aromatic hydrocarbons(PAHs)in the USEPA priority-controlled list by GC-MS.The compound-specific stable carbon isotopes of the individual PAHs were also analyzed by GC-C-IRMS.The sources of PAHs in the SPMs and surface sediments in the Yangtze estuarine and nearby coastal... 相似文献
From the viewpoint of environmental remote-sensing applications, this article explains the overall technical characteristics of the Chinese HJ-1A and HJ-1B satellites. It also investigates the spectral characteristics and potential applications of charge-coupled devices, and the infrared and hyperspectral data obtained by the satellites. Examples of applications, such as the remote-sensing monitoring of algal bloom in Taihu Lake, straw burning in southern China, and aerosol optical depth in the area around Bohai sea are presented. These examples illustrate the application characteristics of the HJ-1A and HJ-1B satellite data. 相似文献
Oils, condensates and natural gases in the Kekeya Field, southeast depression of the Tarim Basin were studied for their geochemical characteristics. According to the distribution analysis of the C2/C3 values with C1/C2 values, C2/C3 values with C1/C3 values, as well as C2/C3 values with dryness index, there are two different types of natural gases in the studied field, which are spatially regularly distributed. One is the oil cracking gas, located on shallow reservoirs over X25 reservoir, namely Upper oil legs; the other is kerogen cracking gas, located on X27 reservoirs, X8 reservoirs and E2k reservoirs, namely Lower oil legs. In addition, the distribution patterns of molar concentration of oils and condensates with different carbon numbers of the n-alkanes in the Kekeya Field indicate that the crude oils have experienced several kinds of secondary alterations, which were closely related to the charging of gaseous hydrocarbons after petroleum accumulation. These results indicate that, based on the research of δ13C values of individual hydrocarbons, heptane values and isoheptane values of light hydrocarbons and aromatic maturity parameters for oils, condensates and natural gases, oils and gases were charged at different geological time in the Kekeya Field.
Variations in physical-chemical factors, species composition, abundance and biomass of nano- and micro-phytoplankton assemblages,
as well as their responses to environmental factors, were investigated over a complete cycle (6 months) in a semi-enclosed
shrimp-farming pond near Qingdao, northern China. The aim was to establish the temporal patterns of phytoplankton communities
and to evaluate protists as suitable bioindicators to water quality in mariculture systems. A total of 34 taxa with nine dominant
species were identified, belonging to six taxonomic groups (dinoflagellates, diatoms, cryptophyceans, chlorophyceans, euglenophyceans
and chrysophyceans). A single peak of protist abundance occurred in October, mainly due to chlorophyceans, diatoms and chrysophyceans.
Two biomass peaks in July and October were primarily due to dinoflagellates and diatoms. Temporal patterns of the phytoplankton
communities significantly correlated with the changes in nutrients, temperature and pH, especially phosphate, either alone
or in combination with NO3-N and NH3-N. Species diversity, evenness and richness indices were clearly correlated with water temperature and/or salinity, whereas
the biomass/abundance ratio showed a significant correlation with NO3-N. The results suggest that phytoplankton are potentially useful bioindicators to water quality in semi-enclosed mariculture
systems. 相似文献
