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Modifications of black carbons and their influence on pyrene sorption
Black carbon (BC) Pyrene Sorption Modification
2013/12/12
Sorption of pyrene on black carbons (BCs) obtained by heating sawdust at two temperatures (400 and700 C, denoted as 400BC and 700BC, respectively), as well as on modified BCs (via oxidation, oximatio...
Physicochemical Properties of PM2.5 and PM2.5–10 at Inland and Offshore Sites over Southeastern Coastal Region of Taiwan Strait
Coastal region Particulate matter Sampling and analysis Physicochemical properties Backward trajectory
2016/3/28
This study investigates the effects of sea-land breezes (SLBs) and northeastern monsoon (NEM) on the physicochemical
properties of particulate matter (PM) in the atmosphere over southeastern coastal ...
研究了在紫外光照射下,Fe(Ⅲ)-柠檬酸盐溶液对Cr(Ⅵ)的光还原反应.同时,考察了溶液pH值、Fe(Ⅲ)浓度、柠檬酸盐浓度、Cr(Ⅵ)初始浓度对光还原效率的影响,并分析了光还原反应的动力学.研究结果表明, Fe(Ⅲ)-柠檬酸盐体系能光还原Cr(Ⅵ),在pH为2.0~6.0的范围内,Cr(Ⅵ)的还原率随着溶液初始pH值的降低而增大.当pH值为2.0、Fe(Ⅲ)浓度为10 μmol·L-1、柠檬酸盐...
重型柴油车道路循环工况下排放特性的仿真分析
重型柴油车 Ｎ Ｏ ｘ 排放 动态特性 道路循环工况
2013/11/11
柴油车道路工况下NOx排放和排温的动态特性对柴油机排气后处理系统的工作以及后处理系统控制策略的确定具有重要的影响.根据6114涡轮增压柴油机的万有特性及NOx和排温的MAP图,仿真分析了道路循环工况下配有6114柴油机的重型柴油车的NOx排放和排温的动态变化;研究了道路工况、行驶特征、驾驶行为以及柴油车载荷等对柴油车排放的影响规律.研究结果表明,城市道路循环工况下,柴油车NOx排放的整体水平不高,...
两种形态的活性炭纤维对水中敌草隆吸附性能的对比
活性炭纤维 吸附 敌草隆
2013/11/11
探讨了粉末和片状两种形态的活性炭纤维对水中敌草隆的吸附行为.结果表明: 粉末活性炭纤维的前期吸附速率较快,平衡吸附量大,但达到吸附平衡的时间较长;pH对两者的平衡吸附量的影响趋势一致,且片状活性炭纤维和粉末状活性炭纤维的最佳pH值分别为2.9和3.1;敌草隆在两种活性炭纤维上的吸附皆为多分子层吸附,吸附行为均适宜采用Redlich-Peterson方程进行描述;假二级方程均适用于描述两种形态活性炭...
环境pH值条件的变化是影响土壤胶体运移的重要因素之一.本文选取土壤体系中常见的两种不同结构类型的粘土矿物胶体高岭石和蒙脱石作为主要实验材料,通过室内模拟实验和数学模型分析的手段,分别研究了不同pH值条件下,两种无机胶体在多孔介质中的迁移规律.结果表明:高岭石胶体受溶液的pH条件影响强烈,随着pH的变化,ξ电位及颗粒粒径大小发生明显变化,不同的pH条件下的穿透曲线差异明显.在酸性条件下,高岭石胶体回...
La-PTFE共掺杂二氧化铅电极的制备及其性能研究
二氧化铅 掺杂 电极 稀土
2013/11/11
以Ti为基体,掺杂La2O3和聚四氟乙烯(PTFE),通过电沉积法制备了Ti/SnO2+Sb2O3/PTFE+La2O3+β-PbO2电极,并将所制备的电极应用于亚甲基蓝模拟染料废水的降解.结果发现,与常规的Ti/SnO2+Sb2O3/PTFE+β-PbO2电极相比,Ti/SnO2+Sb2O3/PTFE+La2O3+β-PbO2电极对亚甲基蓝及COD有较好的去除效果.含有La2O3活性层的Ti/S...
对北京市典型道路交通环境中不同粒径段(0.2~0.5 μm、0.5~1.0 μm和1.0~2.5 μm)的细颗粒物进行了采样分析,在2008—2009年期间5个阶段内共采集了198个细颗粒物样品.通过XRF分析得到细颗粒物中Al、Na、Mg、K、Ca、Si、S、Cl、Fe、Mn、Ti、Cu、Zn、As、Br和Pb 16种元素的质量浓度.含量较高的元素有S、K、Fe、Cl、Si、Ca和Zn,占测试元...
Thermal Formation of Polybrominated Diphenyl Ethers in Raw and Water-Washed Fly Ash
PBDEs Fly ash Formation de novo Precursor
2016/3/28
To the best of our knowledge, the formation mechanisms of PBDEs in the combustion system, fly ash, as well as their
relation with temperature, have never been investigated. In this study, the formati...
Very Long DMA for the Generation of the Calibration Aerosols in Particle Diameter Range up to 10 μm by Electrical Separation
DMA Electrical separation Calibration Transfer function
2016/3/28
For the generation of the quasi-monodispersed standard (calibration) aerosols, the electrical separation of particles from
the aerosol with wide size spectrum can be used in quite a wide particle dia...
Composition of Levoglucosan and Surfactants in Atmospheric Aerosols from Biomass Burning
Surfactants Levoglucosan Biomass burning.
2016/3/28
Biomass burning contributes to various organic substances in the atmosphere. Levoglucosan has been recognised as one of
the indicators of biomass burning and surfactants are a group of molecules whic...
Aerosol Charging Using Pen-Type UV Lamps
Nanoparticle charging UV charger UV irradiation intensity
2016/3/28
A portable aerosol charger utilizing pen-type Hg lamps was constructed to investigate the particle charging process under
UV irradiation. The charger primarily consisted of a quartz tube surrounded b...
为了研究苔藓植物对铅元素的富集特征和对铅污染的生物响应特性,选用多年生、植株体较大、分布广泛且易于采集的匐枝青藓(Brachytheciumprocumbens)为试验材料,在试验区使用不同浓度(0～3.0mmol·L-1)的Pb2+污染液对人工栽植的匐枝青藓进行了动态胁迫试验(7～28d).使用同步辐射光源的X射线荧光分析技术(SRXRF)测定了植株体内Pb、K、P、S、Fe、Zn等多种元素含量...
IMPACTS OF CRAB BIOTURBATION ON THE FATE OF POLYCYCLIC AROMATIC HYDROCARBONS IN SEDIMENT FROM THE BEITANG ESTUARY OF TIANJIN, CHINA
IMPACTS HE BEITANG ESTUARY OF TIANJIN
2013/12/12
Bioturbation by the burrowing crab Helice tiensinensis was investigated to determine its impact on polycyclic aromatichydrocarbon (PAH)-contaminated estuarine sediments. The concentrations of 16 U.S. ...
Perchlorate and Iodide in Whole Blood Samples from Infants, Children, and Adults in Nanchang, China
Perchlorate odide Whole Blood Samples
2013/12/12
Perchlorate, ClO4-, interferes with iodide (I-) uptake by thesodium-iodide symporter (NIS) and thereby affects thyroid hormoneproduction in the body. Studies have reported human exposuresto perchlorat...