农用地土壤环境分类管理研究

通过分析国内外农用地土壤环境分类管理经验,结合我国土壤环境质量状况,以土壤环境风险管控为主线,将农用地土壤分为优先保护类、安全利用类和严格管控类3个类别,并提出相应的分类管理措施,保障农产品质量安全和人体健康。     

基于DPSIR概念模型的土壤环境成效评估方法研究

土壤环境质量关系到农产品质量安全和人居环境健康。对优质土壤实施严格保护、对受污染土壤实施风险管控或治理与修复,构成了土壤污染防治的主体任务。为科学评价土壤污染防治成效,及时采取应对措施,切实维护土壤环境安全,文章在系统总结国内外关于指标概念框架、指标筛选方法等环境成效评估方法基础上,采用DPSIR(驱动力-压力-状态-影响-响应)概念模型,基于可统计、可分解、可考核的原则,构建了可应用于地市和县级行政区土壤污染防治成效评价的指标体系。     

探地雷达在加油站地下罐区泄漏检测中的应用

运用探地雷达进行加油站埋地罐区油品泄漏检测,先后对8座加油站进行了埋地罐区泄漏测试,发现某加油站埋地罐区的疑似泄漏区域,并对疑似泄漏区域进行了验证确认。     

某芳烃装置职业暴露苯致癌风险评估

目的:对苯长期职业性暴露下的致癌风险进行定量评价,以期为职业肿瘤等严重职业病的防控提供依据。方法:选取某大型芳烃装置作业人员为研究对象,利用目前国际上普遍采用的四段法对某芳烃装置苯长期职业性暴露下的致癌风险进行定量评价;通过对工作场所中的职业危害因素进行辨识,收集相关的动物实验、人群流行病学数据等资料,再根据工作场所中实际的环境暴露浓度,建立内暴露的剂量-反应评价多阶模型,运用蒙特卡洛模拟方法得到职业暴露人群在此环境下长期工作所存在的患癌风险概率。结果:该芳烃装置相关工作人员90%情况下苯暴露致癌风险低于2.55×10~(-4)。结论:该装置工人苯暴露的致癌风险超过可接受的致癌风险水平,需要及时采取相应措施降低风险。     

Short-term effects of air pollution on daily hospital admissions for cardiovascular diseases in western China

Controlling the confounding factors on cardiovascular diseases, such as long-time trend, calendar effect, and meteorological factors, a generalized additive model (GAM) was used to investigate the short-term effects of air pollutants (PM₁₀, SO₂, and NO₂) on daily cardiovascular admissions from March 1st to May 31st during 2007 to 2011 in Lanzhou, a heavily polluted city in western China. The influences of air pollutants were examined with different lag structures, and the potential effect modification by dust storm in spring was also investigated. Significant associations were found between air pollutants and hospital admissions for cardiovascular diseases both on dust event days and non-dust event days in spring. Air pollutants had lag effects on different age and gender groups. Relative risks (RRs) and their 95% confidence intervals (CIs) associated with a 10 μg/m³ increase were 1.14 (1.04~1.26) on lag1 for PM₁₀, 1.31 (1.21~1.51) on lag01 for SO₂, and 1.96 (1.49~2.57) on lag02 for NO₂ on dust days. Stronger effects of air pollutants were observed for females and the elderly (≥60 years). Our analysis concluded that the effects of air pollutants on cardiovascular admissions on dust days were significantly stronger than non-dust days. The current study strengthens the evidence of effects of air pollution on health and dust-exacerbated cardiovascular admissions in Lanzhou.     

Relationship between road traffic noisescape and urban form in Hong Kong

This paper reports on a study which explored the possible relationship between road traffic noisescape and urban form in Hong Kong. A total of 212 residential complexes from 11 contrasting urban forms were sampled, and their noise levels assessed both at dwelling and neighbourhood scales by noise mapping. Its findings indicate that residential complexes with different urban forms have significantly different noisescape attributes. There is a strong correlation between the noise characteristics and morphological indicators at the dwelling scale. A less obstreperous noisescape is associated with urban forms with lower road and building densities, and with building arrangements which provide self-noise screening. These findings suggest that urban form is an influential determinant of the noisescape in the urban environment, and they point to the need to rethink the conventional approach to managing the urban acoustic environment.     

欧州环境教育的特点和发展趋势

通过大众媒体和教育系统的作用提高公众的环境意识是欧盟-中国辽宁综合环境项目的公众环境意识子项目.作者随其项目组环境教育学习考察团到欧洲进行了20多天的考察,走访了德国、奥地利等六国19个市镇,参观了34个有关的机构和单位.所见所闻都给大家留下了深刻的印象.     

Estimation of the daily soil/dust (SD) ingestion rate of children from Gansu Province,China via hand-to-mouth contact using tracer elements

A total of 60 children (31 males and 29 females) between the ages of 3 and 12 years were randomly selected from Lanzhou City in Gansu Province, northwest China. Hand (soil/dust) SD samples from these children were collected using hand wipes. We determined the approximate amounts of hand SD and the concentrations of three tracer soil elements (Ce, Y, and V) in these samples. The approximate amounts of hand SD ranged from 42.28 to 173.76 mg, with a median value of 85.42 mg. In addition, the mean amounts of hand SD estimated using the concentrations of Ce, Y, and V in the samples were 4.63, 3.43, and 3.42 mg, respectively. The amount of hand SD varied greatly among the age groups: primary school children had more hand SD than kindergarten children, males had more hand SD than females, and children from rural areas had more hand SD than those from urban areas. The rates of daily ingestion of hand SD for kindergarten and primary school children were estimated to be 7.73 and 6.61 mg/day, respectively.     

Effects of arsenic on nitrate metabolism in arsenic hyperaccumulating and non-hyperaccumulating ferns

This study investigated the effects of arsenic on the in vitro activities of the enzymes (nitrate reductase and nitrite reductase) involved in nitrate metabolism in the roots, rhizomes, and fronds of four-month old Pteris vittata (arsenic – hyperaccumulator) and Pteris ensiformis (non-arsenic--hyperaccumulator) plants. The arsenic treatments (0, 150, and 300 μM as sodium arsenate) in hydroponics had adverse effects on the root and frond dry weights, and this effect was more evident in P. ensiformis than in P. vittata. Nitrate reductase and nitrite reductase activities of arsenate-treated plants were reduced more in P. ensiformis than in P. vittata. This effect was accompanied by similar decreases in tissue NO₃^? concentrations. Therefore, this decrease is interpreted as being indirect, i.e., the consequence of the reduced NO₃^? uptake and translocation in the plants. The study shows the difference in the tolerance level of the two Pteris species with varying sensitivity to arsenic.     

湿法脱硫中真空皮带机脱水效果影响因素

针对多数电厂脱硫石膏含水率偏高的情况,对真空皮带脱水机效果的影响因素进行阐述,主要包括真空皮带脱水机中石膏浆液物料的特性影响、脱硫反应条件的影响和真空皮带脱水机影响因素及处理方法,并根据安徽淮南平圩发电有限责任公司脱硫工程一、二期运行情况提出部分建议。