钷－147在模拟水域生态系中的行为

研究了在模似池塘小生境中,147Pm在水体、土壤及水生生物之间的转移和积累情况,建立了动力学模型。结果表明：其行为符合一级反应动力学模式;水生植物对¹⁴⁷Pm的浓缩能力最强;鱼对¹⁴⁷Pm的吸收极少;¹⁴⁷Pm在土壤中的渗透力较弱,80％浓缩于泥土表层1cm内。因此,水生植物可作为¹⁴⁷Pm污染水体的环境监测指示生物,并可用于净化被¹⁴⁷Pm污染的水体;土壤可以沉淀水体中的147Pm,对去污有一定效果。     

黄渤海沿岸经济贝类体内的石油烃的测定

在１９９０－９７－１９９１－１２期间,监测了黄渤海沿岸经济贝类体内的污染物残留量,计算了沿岸软体动物体内石油烃含量的本底值为３．４７－１９．７ｍｇ／ｋｇ,用本底值的上限作为评价标准,对沿岸贝类的石油污染状况,按污染程度做了海区划分,结果是大连湾,长江口,锦州湾的经济贝类是石油烃污染严重的区域。     

城市浅水型湖泊底泥污染物释放过程模拟试验研究

通过对城市浅水型湖泊(以宁波东钱湖为例)疏浚后上层底泥污染物释放过程模拟试验研究,分析了环境因子对底泥污染物释放特性的影响及其原因,得出了上覆水营养盐水平、水温和扰动对底泥污染物释放的影响曲线.同时,说明了湖泊内源性有机污染源对湖泊水质存在着潜在的危险性,提出了疏浚施工期间的规避措施,为城市浅水型湖泊底泥疏浚和富营养化治理提供依据.     

Cumulative risk assessment of dietary exposure to phthalates in pregnant women in Beijing,China

Diet is an important exposure route for phthalates, such as di-iso-butyl phthalate (DiBP), dibutyl phthalate (DBP), bis(2-ethylhexyl) phthalate (DEHP), and benzyl butyl phthalate (BBP). In this study, we aimed to estimate phthalate exposure in the diet of pregnant women and assess the health risk. A total of 517 pregnant women in the first trimester were recruited, and food frequency questionnaires were collected. A simple distribution assessment method was used to estimate daily exposure, and the hazard index (HI) method was used to assess cumulative risk. The maximum daily dietary exposure to DEHP, DBP, DiBP, and BBP was 5.25, 3.17, 2.59, and 0.58 μg/kg bw/day, respectively, and did not exceed the safety limit values. Cereals and vegetables were the main sources of the estimated daily intake (EDI) of phthalates in the diet. The cumulative risk assessment, based on the European Food Safety Authority tolerable daily intake (TDI) and the US Environmental Protection Agency reference dose (RfD), did not exceed the threshold of 1. DiBP, DBP, and DEHP had higher hazard quotient (HQ) values for cumulative health risk than BBP. In conclusion, a low health risk was posed by the cumulative dietary exposure to phthalates for pregnant women in Beijing.

Graphical abstract

     

精细化工厂污水排放控制措施

中原油田天然气产销总厂精细化工一厂为了实施清洁化生产,对污水外排从控制污水产生入手,采取了改冷却水一次排放为循环利用、化学处理改善水质及提高水的循环利用率等一系列措施,投入改造资金5万余元,将污水日排放量由1200 m3降到50 m3 ,且实现达标排放,取得了较好的经济效益和环境效益。     

Successful and sustainable governance of the lower Yellow River,China: A floodplain utilization approach for balancing ecological conservation and development

Environment, Development and Sustainability - A novel model has been proposed for the methodical development and safe utilization of the lower Yellow River floodplain to provide flood control with...     

Preparation and evaluation of Pd-Sn modified Ru-Ir electrode for denitrification of high chlorine ammonia–nitrogen wastewater

Environmental Science and Pollution Research - In this paper, Pd-Sn modified Ru-Ir electrode was prepared by thermal oxidation method, and the effects of doping amount of Pd-Sn and synthesis...     

Toughness Improvement of Epoxy Composites Using a Kind of Environment-Friendly Bio-Based Polyester Polyol

Journal of Polymers and the Environment - Epoxy resin (EP) is a thermosetting resin with prominent performances and wide applications. However, the inherent brittleness limits its development in...     

遥感技术在油田开发建设项目景观生态评价中的应用

在油田开发建设项目的环境影响评价中,使用遥感技术,将卫星遥感影像数据进行分类处理,结合传统生态学中计算植被优势度值的方法,对油田开发过程中的景观生态进行了评价,取得了较好的效果。简要介绍了该技术的功能特点及应用实例。应用结果表明:遥感技术是对油田开发建设项目景观进行生态评价的重要手段,可以取得真实、可信的评价结果。