Applied Mechanics and Materials Vols. 522-524

Abstract: The correlation analysis of pollution time series is an essential tool for obtaining the relationship in adjacent marine waters and the source of pollution. In this paper, the correlation of the dissolved inorganic nitrogen (DIN) in the Caofeidian marine district and the Beidaihe marine district, Tangshan Bay is analyzed. The spearman correlation coefficient computation method and the least squares fitting method are used for the correlation and the trend respectively. The research results show that the trend of DIN is on the rise in recently. Simultaneously, some certain correlation exists in the Caofeidian marine district and the Beidaihe marine district, owing to the adjacent characteristics and synchronous development in this district.

Abstract: The cross correlation analysis of pollution time series among pollution source and adjacent marine water environmental factors is an essential tool for obtaining the relationship in adjacent marine waters and the source of pollution. Meanwhile, the main pollution source should be obtained by this analysis. In this paper, the cross correlation of the dissolved inorganic nitrogen (DIN) in the Caofeidian marine district, the Beidaihe marine district, Tangshan Bay and the whole quantity of pollution in main rivers of Hebei Province is analyzed. The cross correlation coefficient computation method is used for the correlation. The research results show that the stronger correlation relationship exists between the pollution source and the Beidaihe marine district, owing to the influence of the Luanhe river.

Abstract: The effect of turbidity on the determination of chlorophyll a by laboratory fluorometry-RF5301-Spectrofluorophotometer and online fluorescence instrumentthe On-line Detector for Seawater' chlorophyll were investigated.Using the RF5301-Spectrofluorophotometer determined the fluorescence intensity value of chlorophyll a with different turbidity,using the On-line Detector for Seawater' chlorophyll determined the chlorophyll a concentration with the different turbidity Microcystis aeruginosa samples and water samples.Analyzed the turbidity effect on fluorimetric determination results of chlorophyll a.Researches showed that when the water turbidity was large, due to the strong scattering effect of suspended particulate matter the chlorophyll a determined by fluorometry were on the high side.

Abstract: In order to study the carbon emission characteristics of inland ships, a carbon emission monitoring system is designed. By real-time monitoring of oil consumption and the method of tree of decision in ship discharge, it achieves the monitor of carbon emission. The recursive least square method and Wilcoxon symbols average rank test are used to improve the precision of the carbon emissions monitoring. Finally, through carbon testing experiment, it demonstrates the feasibility of the carbon emission monitoring system, and finds that the main factor affecting the accuracy of the system is carbon oxidation rate.

Abstract: To fully understand the levels of heavy metal contamination and potential ecological risk,content level and distribution characteristics of nine kinds of heavy metal (Ti, Cd, Pb, Zn, Cr, Cu, Hg, As, Al) were analyzed in surface sediments collected in Hejiang River which flows through Hezhou City, a typical developing city in China. Researching enrichment regularity and the possible source of heavy metals by correlation analysis, as well geo-accumulation index (I_geo) was calculated to assess the anthropogenic contamination in the region. Results showed that the levels of sediment heavy metals followed the order: Al > Zn > As > Cu > Pb > Cr > Cd > Tl > Hg; obvious positive correlations were observed amongst the concentrations of Pb, Zn, As, Cd, Cu, Al; the pollution extent of heavy metals in sediments by geo-accumulation index (I_geo) followed the order: Cd > As > Zn > Cu > Pb > Hg > Al > Cr > Tl, the pollution extent of Cd and As were serious at m sampling sites.

Abstract: To study the distribution of heavy metal pollution in Guangxi coastal water, we set up 10 monitoring stations in Guangxi coastal water, monitored and analyzed Hg, Cu, Pb, Cd, As, Zn and Cr in each monitoring stations during 2007 and 2009 dry season. The results show that the heavy metal pollutants distribution concentration of Guangxi coastal water during the dry season can meet Grade I sea water quality standard. From 2007 to 2009, heavy metal pollution of Guangxi coastal water is reduced. Heavy metal contents in seawater of all stations is decreased expected Cu, whose content is slightly elevated. And besides the reduction of As is small, other heavy metals declined obviously, theirs contents are all below or near the detection limit. Cu contamination of seafood proliferative zone and dredged sludge dumping areas need to be strengthened supervision.

Abstract: A multichannel data acquisition device connected to a linux ubuntu computer was used to measure environmental gamma rays intensity and energy spectrum. LabVIEW program stored the data in memory mapped MySQL table during acquisition, java server program sent data to android client through secure sockets layer (SSL). Generation of keystore files and implementation of SSL communication were discussed.

Abstract: The concentration and distribution features of MTBE in the atmosphere in Shenzhen were studied by analyzing samples which were collected in three consecutive days. In this study, pre-concentrator technology and gas chromatography were used. The result showed that the MTBE could was detected in atmosphere of the Shenzhen, and the range of its concentration was from 0.086 - 1.453μgm^-3, including the daily average concentration of 0.662±0.334μgm^-3 in industrial area, 0.331±0.216μgm^-3 in commercial residential area, 0.258±0.154μgm^-3 in tourist area, and 0.158±0.045μgm^-3 in background area. The MTBE concentration in industrial area was 2 times of the commercial residential area, 2.6 times of tourist area and 7 times of the background area. These differences were statistically significant (p<0.008) by the Kruskal-Wallis Test. The MTBE concentration was the highest during one day in the period of 17:00-19:00 of industrial area, which was 0.716±0.306μgm^-3. However, the MTBE concentration in the commercial residential area and tourist area were highest in the period of 11:00-13:00, the MTBE concentration were 0.394±0.224μgm^-3 and 0.446±0.069μgm^-3 respectively. In the workday, the industrial area and commercial residential area were higher compared to the weekend, and the tourist area showed opposite trends, but no matter the comparison of hour average concentration or the workday and weekend, the difference were not statistically significant. It was concluded that the MTBE concentration in atmosphere environment in Shenzhen has the typical spatial specificity because of the different source of MTBE, but has no the time specificity.

Abstract: Surface sediments and water body of the Yalu River estuary were monitored to evaluate the spatial distribution and the enrichment condition of heavy metals: As, Cu, Cd, Cr, Hg, Pb and Zn. Surface sediment samples and water samples were collected from 5 stations, at seven month intervals from May 2012 to November 2012. The correlation of the heavy metals in the surface sediments and the water body was analyzed by using Pearson method. And the method of potential ecological risk index presented by Hakanson was used to evaluate the potential ecological risk of heavy metal pollution in the Yalu River estuary. The results showed that, the order of heavy metals spatial fluctuation degree was Zn > Cr > Pb > Cu > total As > Cd > total Hg, the fluctuation degree of total contents of heavy metals was A1 > A3 > A2 ≈ A4 > A5. The evaluation of potential ecological risk showed that, total Hg reflected considerate ecological risk, total As and Cd reflected moderate ecological risk, and the rest of the heavy metals posed a low ecological risk.

Abstract: From June to July 2012, the heavy metal contents of Pb, Cd, Cr, Cu, Zn, As and Hg in bivalves and the edible fish in Dandong market were determined by using incomplete digestion - AAS method. The results showed that the enrichment of heavy metals in bivalves was higher than those in fish. Significant differences in metal concentrations were found between the tissues of fish. Cd, Pb and Cr were mainly distributed in the scales and gill of the fish. The content of heavy metals in the edible parts of the fish was far below “the human consumption sanitation standard.” The eating quality was good for the edible part of the fish. The content of Cd in bivalves exceeded “the human consumption sanitation standard.” Bivalves containing heavy metals reduced its value for food and attention should be paid on the results.