离子色谱法同时测定工业废气中丁酸和异丁酸

建立了用离子色谱法测定有组疲废气和无组织废气中丁酸和异丁酸的新方法。对实际废气样品进行分析,丁酸和异丁酸的回收率分别为93．0％～103．3％和94．0％～104％。本方法分析速度快,所需样品量少,且无需要复杂的前处理,简便、灵敏、可靠。     

羟基磷灰石/蔗渣炭复合吸附剂的制备及其对As(Ⅴ)的吸附机理

以甘蔗渣为原料,采用水热合成法制备羟基磷灰石/蔗渣炭复合吸附剂--HBA,通过静态吸附试验研究HBA对As（Ⅴ）的吸附特性,并采用红外光谱和X射线光电子能谱对吸附前后的HBA进行表征,探讨其吸附As（Ⅴ）的机理.结果表明:HBA的比表面积为89.52 m2/g,pH_zpc（零点电荷）=7.2,HBA上的羟基磷灰石的分子式为Ca₁₀（PO₄）₆（OH）₂.HBA吸附As（Ⅴ）的效果最佳pH为5.0~9.0.Langmuir等温吸附模型适合拟合HBA对As（V）的吸附等温线,25℃时Langmuir最大吸附量为6.76 mg/g,是蔗渣炭对As（Ⅴ）最大吸附量的20多倍.红外光谱分析表明,HBA含有的＝C＝O、─OH、─COOH等含氧官能团,可为化学吸附提供充足的吸附位点和提高HBA的吸附能力.XPS分析表明,HBA表面的含氧官能团[如羧基（─O─C＝O,532.2 eV）、羟基（─OH,530.6 eV）]参与了吸附反应,羟基磷灰石能提高HBA吸附As（Ⅴ）的能力,被吸附到HBA表面上的As主要以AsO₄3-和HAsO₄2-形态存在.      

5种植物沉床系统对富营养化水体修复效果研究

以狐尾藻、马来眼子菜、金鱼藻、伊乐藻和苦草5种沉水植物为试验材料,构建以沉水植物为核心的人工沉床,探讨富营养化水体中沉水植物的生长状况和沉水植物沉床系统对氮、磷和COD_(Mn)的净化效果。结果表明:5种沉水植物在富营养水体中生长良好,生物量明显增加,以金鱼藻生物量最大。5种沉水植物沉床系统对富营养化水体中的TP、TN和NH_4~+-N去除率较高,均值分别为70.16%、79.60%、79.82%,而对COD_(Mn)的去除率较低,平均为39.74%;其中金鱼藻沉床系统对富营养化水体中的TP、TN、氨氮、COD_(Mn)去除率均最高,分别为79.76%、85.23%、85.81%和46.16%。因此,金鱼藻沉床系统对富营养化水体修复效果最好,同时金鱼藻也是该沉床系统的优选植物。     

非均衡视域下江苏沿海“三极一带多节点”空间发展模式研究

阐述了非均衡发展理论对沿海开发的指导作用,分析了江苏沿海非均衡发展的区域条件,指出了“三极一带多节点”空间发展模式的合理性,提出了实施“三极一带多节点”空间发展模式的战略思考.     

Endocrine disruption effects of 2,2',4,4',6-pentabromodiphenylether (BDE100) in reporter gene assays

Polybrominated diphenyl ethers (PBDEs) constitute an important group of flame retardants. 2,2',4,4',6-Pentabromodiphenylether (BDE100) is a prominent PBDE congener in some human populations. The potential of BDE100 to modulate responses mediated by the estrogen (ER), thyroid hormone (ThR) or androgen receptors (AR) were investigated by use of transactivation reporter gene assays. The African green monkey kidney CV-1 cell transiently transfected with the constructed reporter gene plasmid ERE-TATA-Luc and pUAS-tk-Luc with luciferase (Luc) under control of the estrogen response (ERE), or thyroid hormone response (ThRE) elements were used to evaluate (anti)estrogen and thyroid effects of BDE100. The (anti)androgenic potency of BDE100 was also evaluated by use of MDA-kb2 cells, which were stably transfected with MMTV-luciferase. The assays displayed appropriate responses to known natural estrogen 17β-estradiol (E2), ThR ligand triiodothyronine (T3), and the AR agonist 5α-dihydrotestosterone (DHT). 10 or 50 μM BDE100 significantly up-regulated expression of Luc under control of the ER. Antiestrogenic potency was observed for BDE100 (IC50 = 6.21 μM). Co-exposure to 50 μM BDE100 significantly enhanced expression of Luc caused by 5 nM T3. BDE100 was antiandrogenic at 10 and 50 μM with an IC50 of 28.60 μM BDE100. These results suggest that BDE100 can modulate the endocrine system in multiple ways by interfering with several hormonal signaling pathways simultaneously.     

Top-runner incentive scheme in China: a theoretical and empirical study for industrial pollution control

Environmental Science and Pollution Research - Pollution control policies have achieved remarkable results in China. However, industrial firms still lack enthusiasm for technological innovation to...     

Camphor wood,a potentially harmful museum storage material: an analytical study using instrumental methods

Environmental Science and Pollution Research - Camphor wood is welcomed by museums due to its insect-repelling effect but the smell indicates a potential risk to the collections. In order to judge...     

Arsenic and lead in the indoor residential settings of different socio-economic status; assessment of human health risk via dust exposure

Environmental Science and Pollution Research - In the present study, occurrence of arsenic (As) and lead (Pb) is reported in rural and urban household dust (floor and AC filter dust) of the Kingdom...