Polybrominated diphenyl ethers in sediments of the Daliao River Estuary, China: levels, distribution and their influencing factors

The concentrations, compositional profiles, possible sources of polybrominated diphenyl ethers (PBDEs) in sediments of the Daliao River Estuary as well as the factors influencing the distribution of PBDEs were investigated. The total concentrations of PBDEs ranged from 0.13 to 1.98 ng g⁻¹ d.w. BDE209 was the dominating congener in all sediment samples, indicating the pollution of PBDEs in the Daliao River Estuary mainly came from the use of deca-BDE commercial mixtures. The intrusion of sea waters promoted the deposition of the colloid-associated PBDEs in the estuary. There were significantly negative correlations between PBDE concentration in sediment with pH value and salinity in the bottom water. The higher river flow in the flood season (summer) obviously accelerated the transport of PBDEs, and thereby increased the risk of PBDE contamination to the deep ocean. Moreover, a positive correlation between TOC and PBDE distributions was observed, suggesting that TOC regulated the distributions of PBDEs in sediments of Daliao River Estuary.     

环境保护设施运营存在的问题及对策分析

结合大连市环保设施运营检查工作,分析了当前环保设施运营中存在的主要问题,并对环保设施运营工作的改善提出了对策和建议。     

生态工业园建设在循环经济中的战略意义—大连经济技术开发区生态工业园建设

本文对生态工业园的概念及其建设的重要作用作了介绍。以大连经济技术开发区生态工业园的建设为例,探讨了生态工业园的建设方法,并分析了生态工业园建设所带来的经济效益,从而阐明了生态工业园建设对于发展循环经济的重要战略意义。生态工业园建设是我国发展循环经济、实现经济社会可持续发展的战略选择。生态工业园建设应围绕主导产业构建生态工业产业链,实现区内资源循环利用并运用产业生态管理。     

大连市交通噪声环境质量二级模糊综合评价

采用基于模糊数学的综合二级评判方法评价大连10条城市道路交通环境噪声污染程度。结果表明,受交通噪声冲击影响最大的是西安路大连商业城居民小区路段,影响最小的是如意街大连商业城居民小区路段,与实际调查结果基本一致,体现了该评价方法的合理性和科学性。     

阻燃PVC电工套管氧指数测定中的影响因素分析

通过对阻燃PVC电工套管氧指数测定中的影响因素分析,对现行的阻燃PVC电工套管的氧指数检验方法展开讨论,并为执法部门、建设单位和产品生产商提供数据参考。     

Removal of carbon disulfide via coupled reactions on a bi-functional catalyst: experimental and modeling results

A mathematical model describing the rate of carbon disulfide (CS₂) removal due to coupled reactions has been developed. Kinetic studies were carried out in a fixed bed reactor under atmospheric pressure and a range of temperatures (85–125 °C). The effects of flow rate, CS₂ inlet concentration, temperature and relative humidity were analyzed. A kinetic model based on axial dispersion, external and internal mass-transfer resistances, as well as effects of S deposition on the inner-face of the catalyst was in agreement with the CS₂ experimental breakthrough curves. The mathematical model can be used for process design and scale up of similar systems.     

吹扫捕集气相色谱-质谱法测定土壤中的代森锌

建立了间接测定土壤中代森锌的吹扫捕集气相色谱-质谱法。结果表明,代森锌在土壤中的最低检出限为2μg/kg,加标回收率为85.1%~98.6%。该方法简单、快捷、灵敏度高,能满足农药残留分析的要求。     

二氧化钛光催化技术处理制药废水的实验研究

通过改变二氧化钛浓度、调节pH值、添加H2 O2及铁离子浓度等实验方法,验证了二氧化钛光催化反应处理制药废水的效果。根据测定制药废水中氨氮、COD浓度,计算氨氮、COD的去除率,得出二氧化钛光催化反应的最佳反应条件,为实际应用提供依据。     

发光细菌法评价排污口污水中总有机污染物毒性

利用发光细菌发光原理,建立以明亮发光杆菌(photobacterium phosphoreum)T3变种作为毒性测试物种检测环境中总有机污染物毒性的方法,并用该方法评价环渤海排污口总有机物毒性分布状况。测试结果显示,建立的相关方程及相关性显著性检验P0.01,HgCl2 EC50值基本在0.10±0.02 mg/L范围内波动,指标符合方法规定要求,即发光菌监测排污口中总有机污染物毒性测试结果是准确可信的。用发光细菌法评价环渤海20个排污口,其中剧毒占10%,高毒占25%,重毒占5%,中毒占10%,低毒占50%。发光细菌法能客观、快速、准确地反映废水中总有机污染物毒性状况,该方法在水质监测总有机物毒性中有着广泛的应用前景。     

Assessment of ecosystem health based on fish assemblages in the Wei River basin,China

In the Wei River basin, the ecosystem is gradually deteriorating due to the rapid growth of the population and the development of economies. It is thus important to assess the ecosystem health and take measures to restore the damaged ecosystem. In this study, an index of biotic integrity (IBI) for fish was developed to aid the conservation of the ecosystem based on a calibration data set. An index of water and habitat quality (IWHQ) was calculated based on environmental variables and habitat quality (QHEI) to identify the environmental degradation in the studied sites. The least degraded sites (IWHQ?≤?2; W1, W5, W10, W12, W13, W14, and W16) were chosen as the reference sites. Six metrics that are sensitive to environmental degradation were utilized to differentiate the reference and the impaired sites using statistical methods. These metrics included the number of species (P1), the total biomass (P2), the number of Cobitidae species (P8), the proportion of species in the middle and low tiers (P10), the proportion of individuals that were classified as sensitive species (P25), and number of individuals in the sample (P39). A continuous scoring method was used to score the six metrics, and four classes were defined to characterize the ecosystem health of the Wei River basin. The fact that the overall IBI scores were negatively correlated with the index of environmental quality (IWHQ) based on the validation data set indicated that the index should be useful for biomonitoring and the conservation of biodiversity. According to the results, more than half of the sites were classified as poor or very poor. The ecosystem health in the Wei River was better than that in the Jing River and the Beiluo River, and this study will be a great reference for water resources management and ecosystem restoration in the Wei River basin.