Advanced Materials Research Vols. 726-731

Abstract: Taking water heat pump project in Kaixian Peoples Hospital of Chongqing City as a research example, by long-term monitoring on the lake temperature, nitrogen, phosphorus, and population distribution of algae, the effect of tail-water on phytoplankton of lake was studied. The results show that the tail-water have some influences on the number and diversity of algae in summer when the lake water heat pump system works, and the total number of algae near the tail-water discharge point is lower than that in other regions, but the dominant algae in different sampling points are same at the same time. In winter, cold water discharge makes the total number of algae near the tail-water discharge point essentially higher than that in other regions. Moreover, cold discharge water can reduce the diversity index of the lake phytoplankton. In addition, tail-water has a seasonal influence on lake phytoplankton, and its cumulative environmental impact can be obtained through monitoring and comparative research by long-term.

Abstract: As a very critical indicator of the health of the lake, water level of the river-connected lakes is influenced by both watershed inflows and the mainstream. Lakes connected to the Yangtze River has showed big differences since the impoundment of the TGR in 2003, as the hydrological regime in central Yangtze River has changed a lot. In order to grasp the effect of the TGR on the river-connected lakes, based on the water level data of four typical stations in Poyang Lake during the water release operation and storage period before and after the impoundment, the variation of water level is compared and discussed. It is shown that water level of Poyang Lake has undergone changes. In the water release operation stage, the average water level is higher, but in the storage period from late September to October, the average water level of the lake lower than before. In addition, it is pointed out that the extent is gradually reduced from north to south, as the max influence water level is about 1.5 meters and the average influence water level is about 0.6 meters in Hukou station. However, considering the time since the dam n period has not been long, the reservoir effect still needs to be further assessed based on long-term monitoring.

Abstract: Freezing and thawing of soil is an abiotic stress, and has direct effect on chemical properties, physical properties and biological properties. In order to research effect of freezing and thawing on soil chemical properties, experiments of freeze-thaw cycle were simulated, and different forms phosphorus was measured. Results show that freezing and thawing made water-soluble and loosely combined phosphorus content decrease, but made calcium P content increase. Low-strength freezing and thawing cycle made aluminum P content increase, but made iron P content decrease. To soil of low accumulation phosphorus, low-strength freezing and thawing made occluded P content decrease and be released, but high-strength freezing and thawing made occluded P content increase. Inorganic phosphorus content had an ascending trend with enhancing of freezing and thawing, but organic phosphorus content had a descending trend. Under low-strength freezing and thawing, available P content of soil of low accumulation phosphorus had an ascending trend, and available P content of soil of high accumulation phosphorus had a descending trend, but available phosphorus content had no great changes when strength of freezing and thawing continued to increase.

Abstract: Mining industry in Dalnegorsk district has been developing for more than a hundred of years. This resulted in the formation of the mining technogenic system with the pronounced specific negative action on the ecosphere in total. The study district is characterized by the crisis ecological situation.

Abstract: Modeling carried out by the authors made it possible to show the system parameters, to study the process of the hypergene mineral crystallization from solutions, to take a look at their qualitative and quantitative ion composition, to show the hypergenesis role in the pollution of the surface and ground waters of the district, and to estimate it.

Abstract: A sensitive and selective method for the determination of diethylstilbestrol (DES) by fluorescence immunoassay (FIA) was established on the basis of competitive immunoreaction. The complex of avidin conjugated by quantum dots (QDs-avidin) was regarded as a probe in this system and the avidin-biotin system as the signal amplification system. After optimizing the conditions of immunoreaction such as the time and temperature of incubating, the pH of the buffer solution, the concentration of the reagent and so on, the linear range and the limit of detection of DES were 0.01-2000 ng·mL^-1 and 4.5 pg·mL^-1, respectively. The method was applied to determine DES in flesh of chicken, with the percent recoveries in the range of 81.0%-109.8%.

Abstract: Paper withdrawn at authors request.

Abstract: Soil salinization in Laohe estuarine wetland is becoming more serious, thus the characteristics of AOB in different salt salinity have drawn more attention. Our study investigated the spatial and temporal distribution of ammonia-oxidizing bacteria (AOB) in different salinity soils in Laohe estuarine wetland. Results show that the largest amount of AOB appeared when salinity was 10g/kg, and decrease when salinity was higher (15g/kg, 20g/kg) or lower (2g/kg, 5g/kg). The distribution of AOB shows that the AOB amount is larger in surface layer (0-20cm) than middle layer (20-40cm) or the bottom layer (40-60cm); the AOB is more abundant in summer than autumn. Results indicate that salinity is a key factor on the AOB abundance, but not an influencer on the vertical and temporal distribution of AOB in estuarine wetland. Temperature and organic content are the related factors of the vertical distribution of AOB abundance, and the growth of reed is also an important influence factor on the variation of AOB during different seasons.

Abstract: Through the monitoring and evaluation on landscape water of Kaifeng , knowing about the compliance with the environment of landscape water limits , so as to provide valuable suggestions for the management and protection of landscape water of Kaifeng and provide a basis for sustainable development of urban landscape waters.

Abstract: Ambient levels of carbonyl compounds and their possible sources were investigated in four types of eight shopping malls both in winter and summer in urban district of Nanchang, China. Eighteen out of the twenty target carbonyls were detected in summer samplers while only fifteen carbonyls were detected in winter samplers. Isovaleraldehyde and 2,5-Dimethylbenzaldehyde were close to or under the detection limit in any of the samples, whereas acrolein, o-Tolualdehyde and m-Tolualdehyde were present in only a few summer samples. For the most abundant carbonyls, relative good correlations were found between the concentration of formaldehyde and ozone (R=0.75, p<0.01), acetaldehyde and ozone (R=0.59, p<0.01) in summer (R=0.56, p<0.01), while lower correlation in winter especially for acetaldehyde R=0.46 and acetone R=0.36 p<0.01). This simply means formaldehyde and acetaldehyde in the malls had a significant formation via ozone chemistry in the summer but was poorly correlated with the ozone in winter.