环境空气中苯乙酸监测方法研究

采用预浓缩系统与GC/MS的联用,建立了受污染空气中恶臭气体的分析方法,用苏玛罐采集空气样品在预浓缩系统中经液氮于-160℃冷冻浓缩后,进入GC/MS进行分析.12h内,苏玛罐中24℃的凝结水不影响苯乙酸的再回收,三级冷阱预浓缩技术能够有效的除去水(相对湿度RH>95%)和二氧化碳(3.8%).该方法检测可以达到ng级,经6次重复测定,其相对标准偏差小于6.1%.     

建设好泛长江经济带

泛长江经济带是由长江经济带衍生出的一个新的"大流域"概念。在我国未来"三纵四横"水网布局的大背景下,泛长江经济带不局限于长江干流,同时还应覆盖由长江源头、干流、支流、人工河渠组成的生态系统的大流域,覆盖范围从原有的9省2市增加至包括青海、西藏、广西、陕西、河南、河北、山东、山西、广东、北京、天津在内的18省4市。泛长江经济带的形成是区域内各省市经济社会生态关联日益强化的客观体现。为保证泛长江经济带经济社会各方面的高效运作协调发展,建议组建"长江经济带科学协同发展领导小组"统筹协调区域内各类规划的制定及重大工程的实施,务实推进泛长江经济带建设。     

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。