Advanced Materials Research Vols. 1073-1076

Abstract: Spatial distribution of phosphorus in the buffer zone sediments of 16 rivers around Erhai Lake was investigated in July 2013 and different rivers are classified by hierarchical cluster. The average contents of TP, IP, Ca-P and Fe/Al-P were 822.18mg/kg, 602.42mg/kg, 396.79mg/kg and 150.64mg/kg. IP is the dominant mineral form in surface sediments. The order of the average contents of TP and IP conjects to be: West>South>North, West>North>South, respectively. The spatial distribution of TP, Ca-P and Fe/Al-P in the sediments shows a significant positive correlation with that of IP. All 16 investigated rivers are divided into five types according to the hierarchical cluster analysis: Shuangyuanxi River is one type, Zhonghexi River and Mocanxi River are one type, Boluojiang River and Baihexi River are one type, Yangxi River is one type and the other rivers are one type.

Abstract: In this paper, simultaneous analysis method for deltamethrin, carbaryl, microcystin-LR and benzo[a]pyrene in aqueous solution was established by online solid phase extraction (SPE)-HPLC technology. The target pollutants were enriched in SPE column, eluted by switching the six-way valve, separated by analytical column, and finally measured by UV-VIS Detector (UVD) and Fluorescence Detector (FLD). The results showed that online SPE-HPLC method was suitable for determination of these four organic pollutants. The correlation coefficient of the linear curve was all larger than 0.9990, and the detection limit and the limit of quantitation could also meet the Chinese standard method for drinking water (GB/T 5750-2006 and GB/T 3838-2006). This method achieved simultaneous online enrichment and efficient removal of substrate; avoided tedious manual pre-treatment process, saved the sample volume and processing time, and also had high recovery rate and sensitivity.

Abstract: An economic-environment model is used to analyze economic and environmental impact of reclaimed water utilization in Beijing. The simulation results predict the potential of 130 thousand tons T-N can be reduced for the utilization of reclaimed water by keeping GRP growth rate at 8%. 5 billion tons reclaimed water can be produced by construction of new sewage plants. The utilization of reclaimed water can alleviate water shortage and pollution in Beijing.

Abstract: Using Bacillus licheniformis as identify element, and it was immobilized by sandwich immobilization, a biosensor was fabricated based on oxygen electrode. The experiment indicated that the appropriate pH range is 7.76, the optimum temperature is 35±0.5 °C, and the appropriate concentration of GGA is 21.5 mg/L in bottom fluid, toxicity sensor of biosensor based on Bacillus licheniformis has a linear response from 10 to 80 μg/L and the standary curve is y=0.0026x-0.01, its linear correlation is 0.9669. The immobilization membrane produced by Bacillus licheniformi save more than 40 days, and measured 3 ~ 4d for activation, the performance of the system is stable.

Abstract: This article studied about the air pollution in China. The main causes of the air quality deterioration in the country were analyzed as well as possible ways of the environmental situation improvement were suggested.

Abstract: In the process of high sulfur gas field development, the sulfur will separate out from the mixed gas when the pressure near wellbore area drops to a critical pressure of H₂S. This will reduce the reservoir porosity greatly and decrease the gas well productivity as well. This paper discusses the characteristics of pressure transient testing plots when sulfur deposition occurs based on the redial composite reservoir model. And introduce an approach to determine the sulfur deposition radius near the wellbore with pressure transient testing interpretation in high sulfur gas reservoir. The method has been applied in some high sulfur gas field in eastern Sichuan Basin. The result shows that the method is simple and practical.

Abstract: Ferrocene (Fc) is an organometallic compound of sandwich structure. As the anticancer and excellent electrical activities, ferrocene and its derivatives have many applications in electrochemical monitoring [1-3]. Hydrogen peroxide (HP), with strong permeability and oxidation properties, is the product of many peroxidase catalyzed reaction, and it is widely used in medical and cosmetic fields, even for food bleaching by some illegal merchants which may cause healthy problem. In this study, the polyelectrolyte multilayer films containing ferrocene-derived polymer assembling by sol-gel process [4] was introduced to HP determination as a sensor.

Abstract: The paper discusses the live detection methods for MOA and analyzes their characteristics. The primary live detection methods are the methods of compensation and fundamental resistive current. By contrastively testing in laboratory and in the field, it compares and analyses the disparities of the measuring data. This paper can provide a valuable reference for the testing personnel in the future to judge the test results effectively.

Abstract: Chlorine dioxide has been used widely in many fields recent years. In order to develop an easy and steady spectrophotometry method to determination Chlorine dioxide, acid green B was used as a fading agent. The effect of wavelength, pH, and reaction time was investigated. The analysis was determined as: wavelength of 606nm, pH 9 ammonia buffer solution, and reaction time of 5min. This spectrophotometry method represents good accuracy and precision in adding standard recovery tests and repeated tests. The detection limit is 0.3mg/L. Because only two agents are used, it is a handy method for analyzing chlorine dioxide in water in the field application.

Abstract: For the airborne weather radar signal processing, the intensity of the meteorological targets is represented by the physical quantity called reflectivity factor. When observing the middle-or long-range meteorological targets at low altitude from a high-altitude radar platform, due to the incomplete beam filling, the retrieval result of the reflectivity factor is much less than the actual value. In this paper, we firstly introduce a beam filling coefficient into the weather radar equation and then present its estimation method based on the real-time radar operating parameters. The validity of the proposed method is then verified by processing the raw-data of the simulated meteorological targets.