纳米银与镉的复合毒性对拟南芥根系形态及叶片生理指标的影响

为研究纳米银（AgNPs）与镉（Cd²⁺）对拟南芥的复合毒性,本文以不同浓度的PVP coated-AgNPs和Cd²⁺处理拟南芥幼苗一周后,测定了拟南芥幼苗主根长度,根毛数量,叶片中光合色素和可溶性蛋白含量及抗氧化系统相关酶活性.结果表明,高浓度（5mg/L） Cd²⁺能显著抑制根长,提高可溶性蛋白含量及SOD（超氧化物歧化酶）和POD（过氧化物酶）的活性.在高浓度Cd²⁺（5mg/L）中加入AgNPs能显著增强Cd²⁺对根长的抑制作用,而高浓度的Cd²⁺能缓解AgNPs对根毛的抑制作用;在低浓度Cd²⁺（0.1mg/L和1mg/L）中加入AgNPs能显著增强Cd²⁺对色素含量抑制作用;在含有Cd²⁺的处理中,SOD和POD在1mg/L AgNPs下活性最高;以上结果说明Cd²⁺和AgNPs对拟南芥幼苗根系形态及叶片生理指标都存在交互影响.     

秦皇岛港煤三、四期码头及附近区域大气降尘环境污染分析

论述了煤炭港口大气降尘与煤尘污染的关系。通过对秦皇岛港煤三、四期码头及附近区域大气降尘的长期连续监测以及对资料进行整理，分析了大气降尘的分布特征，从而得到港口投产以来的煤尘污染变化及趋势。     

GIS支持下的土壤侵蚀量估算——以江西省泰和县灌溪乡为例

在地理信息技术（ＧＩＳ）的支持下，应用通用土壤侵蚀方程（ＵｎｉｖｅｒｓａｌＳｏｉｌＬｏｓｓＥｑｕａｔｉｏｎ，简称ＵＳＬＥ）估算了江西省泰和县灌溪乡的土壤侵蚀量。研究结果表明，当地表覆盖率大于１５％时，计算的结果与实测的数据有良好的相关性（０８７）。     

GIS支持下的土壤侵蚀量估算——以江西省泰和县灌溪乡为例

在地理信息技术（ＧＩＳ）的支持下,应用通用土壤侵蚀方程（ＵｎｉｖｅｒｓａｌＳｏｉｌＬｏｓｓＥｑｕａｔｉｏｎ,简称ＵＳＬＥ）估算了江西省泰和县灌溪乡的土壤侵蚀量。研究结果表明,当地表覆盖率大于１５％时,计算的结果与实测的数据有良好的相关性（０８７）。     

A walking-based measurement for understanding the relationship between dense urban form and community facility distribution: a case study in the old town of Fuzhou,China

Environment, Development and Sustainability - Improving the livability and sustainability of the dense urban environments in the old town of cities has been a focus of attention in urban planning,...     

Spatial distribution and temporal trends of polycyclic aromatic hydrocarbons (PAHs) in water and sediment from Songhua River, China

The spatial and temporal distributions of polycyclic aromatic hydrocarbons (PAHs) in the Songhua River, Harbin, China, were investigated. Seventy-seven samples, 42 water and 35 sediment samples, were collected in April and October of 2007 and January of 2008. The concentrations of total PAHs in water ranged from 163.54 to 2,746.25 ng/L with the average value of 934.62 ng/L, which were predominated by 2- and 3-ring PAHs. The concentrations of total 16 PAHs in sediment ranged from 68.25 to 654.15 ng/g dw with the average value of 234.15 ng/g dw, which were predominated by 4-, 5- and 6-ring PAHs. Statistical analysis of the PAH concentrations shown that the highest concentrations of the total PAHs were found during rainy season (October of 2007) and the lowest during snowy season (January of 2008). Ratios of specific PAH compounds, including fluoranthene/(fluoranthene + pyrene) (Flu/(Flu + Pyr)) and phenanthrene/(phenanthrene + anthracene) (An/(Ant + PhA)), were calculated to evaluate the possible sources of PAH contaminations. These ratios reflected pyrolytic inputs of PAHs in Songhua River water and a mixed pattern of pyrolytic and petrogenic inputs of PAHs in the Songhua River sediments. Ecotoxicological risk levels calculated for PAHs suggested that there were individual PAHs, which can less frequently cause biological impairment in some samples, but no samples had constituents that may frequently cause biological impairment. Total toxic benzo[a]pyrene equivalent of ΣcPAHs varied from 10.03 to 29.7 ng/g dw and from 0.36 to 1.92 ng/g dw for total toxic tetrachlorodibenzo-p-dioxin equivalent. The level of PAHs indicated a low toxicological risk to this area.     

美国城市生活垃圾处理现状及思考

介绍了美国城市垃圾现状,美国环保总局对垃圾管理的政策及美国处理城市生活垃圾的方法。指出了我国处理城市生活垃圾存在的问题并提出了改进建议。     

Characterization of electrode fouling during electrochemical oxidation of phenolic pollutant

• Electrode fouling is characterized by non-destructive characterization. • Electrode fouling is highly dependent on electrochemical process. • Active chlorine can prevent the formation of polymeric fouling film. Electrode fouling is a problem that commonly occurs during electro-oxidation water purification. This study focused on identifying the fouling behavior of Pt electrode associated with the formation of polymeric layer during electro-oxidation of phenol. The in situ electrochemical measurements and non-destructive observation of the electrode morphology were reported. The results demonstrated that the electrode fouling was highly dependent on thermodynamic process of electrode that was controlled by anode potential. At anode potential lower than 1.0 V vs SHE, the direct electro-oxidation caused the electrode fouling by the formation of polymeric film. The fouling layer decreased the electrochemically active surface area from 8.38 cm² to 1.57 cm², indicated by the formation of polymeric film with thickness of 2.3 mm, increase in mass growing at a rate of 3.26 μg/cm²/min. The degree to which the anode was fouled was independent of anion in the electrolyte. In comparison, at anode potential higher than 2.7 V vs SHE, the anions (e.g., chloride) could exert a major influence to the behavior of electrode fouling. The presence of chloride was shown to mitigate the fouling of electrode significantly through preventing the formation of polymeric film by active chlorine (e.g., Cl• and Cl₂) produced from anodic oxidation of chloride. Since chloride is the most abundant anionic species existing in both natural and engineered water system, this study not only offers a deep insight into the mechanism of electrode fouling, but also suggests strategies for anti-fouling in the presence of chloride in electro-oxidation process.     

工业循环冷却水系统中的浓缩倍数

循环冷却水系统的浓缩倍数Ⅳ是一个重要参数。探讨了浓缩倍数与补充水量、排污量以及循环利用率的关系,并说明了控制浓缩倍数的重要性。     

悬浮填料对曝气池充氧能力影响的试验研究

通过清水曝气充氧试验测定在不同填充率情况下水中溶解氧量的变化,分析悬浮填料能否增加曝气池溶解氧的转移速率。试验结果表明：悬浮填料对微孔曝气充氧速率无明显加速作用。