水样中亚铁及总铁含量连续测定方法探讨

文章研究了在同一样品溶液中连续测定亚铁和总铁的分析方法,对同一标准样品溶液和实际样品进行了单独测定亚铁和总铁含量的实验,同时在完成亚铁含量测定后加入试剂,进行了总铁含量的连续测定,并对实验数据进行相对误差分析。结果表明:单独和连续测定的总铁含量数据无显著性差异,方法切实可行。     

煤化工煤焦油逸出废气回收利用技术研究

通过对河北省秦皇岛市耀华玻璃工业园有限公司地下300m,储油罐煤焦油逸出废油气进行实验室模拟实验,现场实际工程设计、制造、安装、调试、检验等实践研究,采用“冷凝＋自激吸收器＋吸收＋活性炭吸附”油气处理回收技术,并独创了自激吸收器新技术,处理后的煤焦油逸出废气完全达到了国家《炼焦化学工业污染物排放标准》（GB16171—2012）的相关要求。     

济南市水生态文明与产业布局优化研究

济南市水资源主要存在着地下水限量开采、地表水严重不足、客水利用受到制约等问题。以济南市创建水利部水生态文明城市为背景,研究济南市水生态文明城市建设与产业布局优化,分析了济南市产业布局不合理给水资源保护和利用带来的严峻挑战,提出了以济南市水生态保护为目标的产业优化布局方案,建议大力发展水生态文明城市建设相关产业。     

Persulfate activation by ferrocene-based metal–organic framework microspheres for efficient oxidation of orange acid 7

Environmental Science and Pollution Research - Ferrocene-based metal–organic framework with different transition metals (M-Fc-MOFs, M?=?Fe, Mn, Co) was synthesized by a simple...     

Current status of microplastics pollution in the aquatic environment,interaction with other pollutants,and effects on aquatic organisms

Environmental Science and Pollution Research - Microplastics, as emerging pollutants, have received great attention in the past few decades due to its adverse effects on the environment....     

ICCLP: An Inexact Chance-Constrained Linear Programming Model for Land-Use Management of Lake Areas in Urban Fringes

Lake areas in urban fringes are under increasing urbanization pressure. Consequently, the conflict between rapid urban development and the maintenance of water bodies in such areas urgently needs to be addressed. An inexact chance-constrained linear programming (ICCLP) model for optimal land-use management of lake areas in urban fringes was developed. The ICCLP model was based on land-use suitability assessment and land evaluation. The maximum net economic benefit (NEB) was selected as the objective of land-use allocation. The total environmental capacity (TEC) of water systems and the public financial investment (PFI) at different probability levels were considered key constraints. Other constraints included in the model were land-use suitability, governmental requirements on the ratios of various land-use types, and technical constraints. A case study implementing the system was performed for the lake area of Hanyang at the urban fringe of Wuhan, central China, based on our previous study on land-use suitability assessment. The Hanyang lake area is under significant urbanization pressure. A 15-year optimal model for land-use allocation is proposed during 2006 to 2020 to better protect the water system and to gain the maximum benefits of development. Sixteen constraints were set for the optimal model. The model results indicated that NEB was between $1.48 × 10⁹ and $8.76 × 10⁹ or between $3.98 × 10⁹ and $16.7 × 10⁹, depending on the different urban-expansion patterns and land demands. The changes in total developed area and the land-use structure were analyzed under different probabilities (q _i ) of TEC. Changes in q _i resulted in different urban expansion patterns and demands on land, which were the direct result of the constraints imposed by TEC and PFI. The ICCLP model might help local authorities better understand and address complex land-use systems and develop optimal land-use management strategies that better balance urban expansion and grassland conservation.     

Bioavailability and tissue distribution of Dechloranes in wild frogs (Rana limnocharis) from an e-waste recycling area in Southeast China

Dechlorane Plus(DP), a flame retardant used as an alternative to decabromodiphenylether, has been frequently detected in organisms, indicating its bioaccumulation and biomagnification potential in aquatic and terrestrial species. However, little data is available on the bioaccumulation of DP in amphibians. Dechlorane Plus and its analogs(DPs) were detected in the liver, muscle and brain tissues of wild frogs(Rana limnocharis), which were collected from an e-waste recycling site, Southeast China. DP, Mirex, Dec 602 and a dechlorinated compound of DP(anti-Cl11-DP) varied in the range of 2.01–291, 0.650–179, 0.260–12.4, and not detected(nd)–8.67 ng/g lipid weight, respectively. No difference of tissue distribution was found for syn-DP, Mirex and Dec 602 between the liver and muscle tissue(liver/muscle concentration ratio close to 1, p 0.05). However, higher retention was observed for anti-DP and anti-Cl11-DP in the frog muscle relative to the liver tissue(liver/muscle concentration ratio 1, p 0.05). Additionally, the blood-brain barrier was found to work efficiently to suppress these compounds entering brain tissues in this species(liver/brain concentration ratio 1, p 0.05), and the molecular weight was a key factor impacting the extent of the blood-brain barrier. Compared to levels in the muscle and brain tissue, a preferential enrichment of syn-DP was observed in the liver tissue, suggesting the occurrence of stereo-selective bioaccumulation in the wild frog.     

Removal of perchlorate from aqueous solution by cross-linked Fe(Ⅲ)-chitosan complex

Cross-linked Fe（III）-chitosan composite （Fe-CB） was used as the adsorbent for removing perchlorate from the aqueous solution. The adsorption experiments were carried out by varying contact time, initial concentrations, temperatures, pH, and the presence of co-existing anions. The morphology of the adsorbent was discussed using FT-IR and SEM with X-EDS analysis. The pH ranging from 3.0-10.2 exhibited very little effect on the adsorption capability. The perchlorate uptake onto Fe-CB obeyed Langmuir isotherm model. The adsorption process was rapid and the kinetics data obeyed the pseudo second-order model well. The eluent of 2.5% （W/V） NaC1 could regenerate the exhausted adsorbent efficiently. The adsorption mechanism was also discussed.     

蕹菜镉积累典型品种的根际土壤酶研究

通过在镉含量高、低不同的2种土壤上的自制根箱试验并对所种植作物的镉含量进行相关性分析,研究了两种蕹菜镉积累典型品种,强坤柳叶白骨（QK,Cd-PSC）和台湾308纯白柳叶（T-308,非Cd-PSC）的根际土壤酶区系.结果表明：品种间茎叶镉含量差异极显著;在高镉条件下,蕹菜茎叶Cd含量与根际转化酶活性呈显著正相关;在低镉条件下,与根际碱性磷酸酶活性呈显著负相关.