Determination of 4-tert-octylphenol, 4-nonylphenol and bisphenol A in surface waters from the Haihe River in Tianjin by gas chromatography-mass spectrometry with selected ion monitoring

The estrogenic pollutants 4-tert-octylphenol (OP), 4-nonylphenol (NP) and bisphenol A (BPA) were determined in surface water samples from the Haihe River, Tianjin, China. The analytes were extracted and concentrated from 300 ml acidified water samples by liquid–liquid extractions using dichloromethane, derivatized with trifluoroacetic anhydride, and quantified by gas chromatography–mass spectrometry (GC–MS) with selected ion monitoring (SIM). Among the samples collected from 14 sampling sites, only one sample was found to have a relatively high concentration of BPA (8.30 μg l⁻¹) and NP (0.55 μg l⁻¹). The concentrations of OP, NP and BPA in the other samples were in the range of 18.0–20.2, 106–296 and 19.1–106 ng l⁻¹, respectively. Recoveries for OP, NP and BPA in the spiked water samples were all over 80%.     

Multifunctional rural transition along China’s Yangtze River Transect: Spatial differentiation and economic relevance

Environmental Science and Pollution Research - To understand rural sustainability, it is necessary to scrutinize the relationship between rural transition and economic growth. The article uses...     

Fe3O4-TiO2Al吸附剂去除水中氟离子

以实验室制备的Fe3O4-TiO2·nH2O·Al吸附剂处理模拟和实际含氟废水,探讨了吸附剂用量、体系pH、吸附温度和吸附时间等因素对F-吸附效果的影响。结果表明:在初始F-浓度16.1 mg/L,起始pH 8.0,吸附剂投加量5 g/L,室温(约25 ℃)下吸附15 min时,模拟和实际废水的出水F-均可达到3O4-TiO2·nH2O·Al具有一定的实际应用价值。含氟水溶液初始pH对Fe3O4-TiO2·nH2O·Al吸附F-性能影响较大。在pH 介于3.0~5.0 时,吸附容量较大,过高或过低都会导致吸附容量降低。Fe3O4-TiO2·nH2O·Al吸附F-的过程为放热反应,升温不利于F-的吸附。该吸附剂吸附F- 的过程为化学吸附,符合准二级动力学模型,等温线拟合接近Freundlich吸附等温线。     

餐饮业外排烹调油烟气的危害及净化方法研究进展

我国快速发展的餐饮业外排的油烟气污染日趋严重,其毒性研究结果表明其中所含的污染物对人体健康有较大危害;油烟气形态及组成的特殊性使其净化处理较困难,国内外研究者针对这一问题相继作出了不少研究,取得了一定程度的进展.但对中国而言,仍然缺乏实用高效的油烟气净化技术.     

A combined radical and non-radical oxidation processes for efficient degradation of Acid Orange 7 in the homogeneous Cu(II)/PMS system: important role of chloride

Environmental Science and Pollution Research - Trace copper ion (Cu(II)) in water and wastewater can trigger peroxymonosulfate (PMS) activation to oxidize organic compounds, but it only works under...     

Cadmium accumulation, activities of antioxidant enzymes, and malondialdehyde (MDA) content in Pistia stratiotes L.

The aquatic plant Pistia stratiotes L. (water lettuce) was studied due to its capability of absorption of contaminants in water and its subsequent use in wetlands constructed for wastewater treatment. The effects of Cd on root growth, accumulation of Cd, antioxidant enzymes, and malondialdehyde (MDA) content in P. stratiotes were investigated. The results indicated that P. stratiotes has considerable ability to accumulate Cd. Cadmium induced higher superoxide dismutase (SOD) and peroxidase (POD) activities than catalase activity, suggesting that SOD and POD provided a better defense mechanism against Cd-induced oxidative damage. The accumulation of Cd promoted MDA production.     

不同施肥措施下长江经济带地区农田土壤有机碳含量的变化分析

收集整理1992年1月至2022年5月长江经济带地区长期定位施肥试验文献,提取并整合了其中农田土壤有机碳的资料.采用归一化处理和变化速率的分析方法,研究长期不同施肥措施下长江经济带地区农田土壤有机碳含量的总体变化,并比较3种耕作模式及不同土壤类型下土壤有机碳含量的变化差异,判断分析试验持续年限长短对土壤有机碳动态的影响.结果表明,在长期不同施肥措施下,我国长江经济带地区农田土壤有机碳含量整体呈上升趋势,无机氮肥磷肥配施(NP)、无机氮磷钾肥配施(NPK)、单独施用有机肥(O)和有机无机肥配施(NPKO)处理均能增加农田土壤的有机碳含量,其中以NPKO处理为最大,而单独施用无机氮肥(N)则会降低土壤有机碳含量.旱田、水田和水旱轮作农田土壤有机碳含量变化速率分别为0.22、 0.24和0.16g·(kg·a)^-1,3种耕作模式在土壤固碳效果方面并无显著性差异.O和NPKO处理下所带来的有机碳相对快速增加效应在旱田土壤中的持续年限最高不超过28 a,而在水田及水旱轮作土壤中依然可以持续到28 a以上.在不同的土壤类型下,土壤有机碳含量的变化速率存在着一定的差异,平均有机...     

总量控制目标分解计算有关问题的探讨

对总量控制目标分析计算的有关问题进行了讨论，如预留发展量，预留改善量的概念及规划方法，点源总量控制指标的分析计算方法等。分解计算分“一步到位法”和“两步到位法 ”两种方式，诸地有所区别。