BP人工神经网络预测邻苯二甲酸酯光化学降解

将反向传播人工神经网络（BP－ANN）用于邻苯二甲酸酯类化合物的光化学降解的预测中，选取正交设计的试验点作为反向传播人工神经网络的训练集，实现对全实验域试验点的预测，并与实测的试验数据比较。结果表明反向传播人工神经网络（BP－ANN）具有良好的预测能力。     

银在活性炭上的吸附行为和机理的研究

本文研究了银在活性炭上的吸附行为，探讨了影响吸附效率的各种因素。考察了多种溶液对吸附银的洗脱效果，发现银在活性炭上的吸附不是还原吸附，而是以离子形成与活性炭表面的－ＮＨ２和＝ＮＨ形成络合物而被吸附。     

The negative effects of cadmium on Bermuda grass growth might be offset by submergence

Revegetation in the water-level-fluctuation zone (WLFZ) could stabilize riverbanks, maintain local biodiversity, and improve reservoir water quality in the Three Gorges Reservoir Region (TGRR). However, submergence and cadmium (Cd) may seriously affect the survival of transplantations. Bermuda grass (Cynodon dactylon) is a stoloniferous and rhizomatous prostrate weed displaying high growth rate. A previous study has demonstrated that Bermuda grass can tolerate deep submergence and Cd stress, respectively. In the present study, we further analyzed physiological responses of Bermuda grass induced by Cd-and-submergence stress. The ultimate goal was to explore the possibility of using Bermuda grass for revegetation in the WLFZ of China’s TGRR and other riparian areas. The Cd-and-submergence-treated plants had higher malondialdehyde contents and peroxidase than control, and both increased with the Cd concentration increase. All treated plants catalase activity increased with the experimental duration increases, and their superoxide dismutase also gradually increased with the Cd concentration from 1 day to 15 days. Total biomass of the same Cd-and-submergence plants increased along the experimental duration as well. Plants exposed to Cd-and-submergence stress showed shoot elongation. The heights of all treated plants were taller than those of the control. Leaf chlorophyll contents, maximum leaf length, and soluble sugars contents of all the Cd-and-submergence-treated plants were more than those of the untreated control. Although Cd inhibits plants growth, decreases chlorophyll and biomass content, and with the submergence induced the leaf and shoot elongation, more part of the Cd-and-submergence stress plants appeared in the air, exhibited fast growth with maintenance of leaf color, which guaranteed the plants’ photosynthesis, and ensured the total biomass and carbohydrate sustainability, further promoting Cd-and-submergence tolerance. The results imply that the negative effects of cadmium on Bermuda grass growth might be offset by submergence.     

含铜酞菁染料废水及树脂废水的处理工艺研究及应用

采用逆流洗涤方式有效减轻酸污染。含铜酞菁废水采用铁炭微电解预处理技术 ,树脂废水采用物化预处理技术 ,再通过厌氧水解———SBR好氧生化处理技术的工艺流程 ,成功地治理了该有机化工废水 ,出水达到国家排放标准     

Performance evaluation of urban environmental governance in Anhui Province based on spatial and temporal differentiation analyses

Environmental Science and Pollution Research - When the process of urbanization has brought economic benefits in the Yangtze River Delta of China, environmental pollution becomes increasingly...     

Plant communities in relation to `flooding and soil characteristics in the water level fluctuation zone of the Three Gorges Reservoir, China

With the filling of the Three Gorges Reservoir, original vegetation in the water level fluctuation zone (WLFZ) between the elevations of 145 and 175 m disappeared due to the reversal of submergence time (winter flooding) and prolonged inundation duration (nearly half a year). To better understand the relationships between the environmental factors and recovered plant communities for reconstructing floristically diverse riparian zone, we conducted a field survey in 11 sites in the WLFZ in June 2010, and vegetation composition, flooding characteristics, heavy metals, and soil major nutrients were determined. Consequently, the canonical correspondence analysis was used to investigate the relationships between plant species composition and flooding characteristics, heavy metal contamination, and soil nutrients. Results demonstrated that vegetation in the WLFZ was dominated by annuals, i.e., Echinochloa crusgalli and Bidens tripartita, and perennials including Cynodon dactylon, and plant species richness and diversity were negatively associated with flooding duration, heavy metal contamination, and nutrients including total phosphorus, available phosphorus, available potassium, and nitrate. Our results suggest that plant species, recovering mainly through soil seed bank and regeneration of remnant individuals, have been influenced by the combined effects of environmental factors.     

示波极谱法测定空气中硫化氢

本文采用NaOH、EDTA和三乙醇胺混合溶液吸收空气中H2S3然后直接对吸收液进行示波段谱测定。方法的线性范围为0．003-5．0ppm，最低检出浓度为3ppb，相对标准差为1．2～2．7％，回收率为91．4～104．6％。应用本法测定了11份空气样品，测定结果与亚甲基蓝比色法一致。     

水中硫化物形态分析方法研究

本文研究了水中硫化物形态分析的方法,提出了一件简便、准确、灵敏的分析方法,并用此方法分析了河水及生活污水水样,获得满意效果,其溶解态硫化物所占百分比为10.3～71.7％。