一种Cr(Ⅵ)的新显色反应及其在环境水样分析中的应用

合成了超高灵敏显色剂二安替比林对乙氧基苯基甲烷、在磷酸介质中,Ｍｎ存在下,ＤＡｐＥＭ与Ｃｒ生产黄色产物,λｍａｘ＝４５０ｎｍ,ε＝１．３６×１０＾６ｌ．（ｍｏｏ．ｃｍ）＾－１,铬含量在２－３２μｇ／Ｌ内符合比尔定律,用于环境水样中Ｃｒ的测定,结果满意。     

甲醇装置酸性尾气工业处理试验

进行了甲醇装置酸性尾气工业处理试验,用体积分数为25％～30％的N-甲基二乙醇胺(MDEA)水溶液提浓该酸性尾气,提浓后的酸性尾气送至克劳斯硫磺回收装置回收硫磺。在再生塔底温度为124℃、气液比为80、吸收塔塔板为11层的条件下脱除H2S,净化气中H2S体积分数小于0．25％,去除率为97．3％。该项目的实施消除了HCN、CH30H、H2S等有毒气体对大气环境的污染,同时可回收硫磺736t／a,具有较大的社会效益和一定的经济效益。     

丛枝菌根真菌对紫羊茅镉吸收与分配的影响

采用盆栽方法模拟土壤Cd污染状况,研究接种丛枝菌根真菌对紫羊茅生长及对Cd吸收、分配的影响.结果表明,土壤加Cd15～50mg·kg-1对菌根侵染率无显著影响;在不加Cd的土壤中,接种菌根真菌有助于Cd的吸收和向地上部的运输;在Cd污染土壤中,接种菌根真菌并未明显改善紫羊茅的磷营养状况,并且也没有明显增加紫羊茅的生物量,但是地上部的Cd浓度和吸收量均显著低于不接种的处理,其原因是菌根真菌强化了Cd在紫羊茅根系的固持作用,减少Cd在地上部的分配比例,从而降低了紫羊茅地上部对Cd的积累.试验还观察到,不同菌根真菌对紫羊茅吸Cd量的影响具有一定差异,Glomusintraradices在Cd污染的土壤中对Cd吸收的抑制效应大于Glomousmosseae.这些结果一方面说明菌根真菌侵染是紫羊茅地上部Cd含量减少的直接原因,同时也反映出在自然生态系统中,作为污染物由土壤环境进入食物链系统的门户之一的丛枝菌根真菌在调节生态系统中重金属Cd的生物循环、减轻重金属Cd对食物链的污染风险方面发挥着重要作用.     

化工园区爆炸事故高苯胺河水脱毒预处理技术比较与应用

江苏某化工园区发生爆炸,造成周边河道积聚大量高苯胺河水,该类受污染河水具有较高的活性污泥抑制性,需在进入园区污水处理厂应急处理前进行脱毒预处理.研究对比了芬顿氧化法、活性炭吸附法和生物处理法对受污染河水的预处理效果.结果表明,芬顿氧化法处理效率较高、运行成本中等,且现场处理设施易于改造利用,最终被选为高苯胺河水的脱毒预...     

焦作市市区地下水水质现状评价

在分析焦作市市区孔隙水赋存情况的基础上 ,运用模糊综合评判和灰色聚类评价相结合的方法 ,对该市市区地下水水质进行了现状评价 ,克服了目前传统的指数评价法和单独运用模糊综合评判法存在的弊端 ,使评价结果更为客观。     

脱硫反应器及其应用

脱硫反应器是脱硫工艺的核心装置 ,其技术和脱硫指标将制约和决定脱硫工艺的效率。在分析中 ,比较全面地介绍和比较了近年来主要的烟气脱硫反应器设备和研究成果及应用情况 ,指出了脱硫反应器的发展方向     

Urinary phenols and parabens metabolites associated with cardiovascular disease among adults in the United States

Environmental Science and Pollution Research - The field of environmental health has begun to examine the effects of higher-order chemical combinations. The current literature lacks studies...     

撞击流反应器萃取电镀废水中Cr6+的实验研究

以磷酸三丁酯（TBP）为萃取剂,用撞击流反应器对模拟含铬电镀废水中的Cr^6＋进行了萃取脱除实验研究。与相同条件下的传统单级化学萃取相比,撞击流反应器利用两喷嘴的射流作用在两流体相对撞击时获得高效传质区域,能有效强化液液萃取的相际传质过程,其单级萃取率最多可提高20．11％。当萃取剂中TBP的体积分数为10％、相比（有机相与水相的体积比）为1：2、萃取时间为1min、H^＋的浓度为1．0mol／L时,通过实验得出适宜的操作条件为：喷嘴间距离为喷嘴直径的3．4倍,搅拌转速600r／min,萃取温度30—40℃,在此条件下Cr^6＋的萃取率为31．5％。     

超声波处理剩余活性污泥促进厌氧消化

用超声波处理剩余活性污泥(简称污泥),考察了污泥絮体结构、污泥中溶解性化学需氧量(SCOD)的变化规律及超声波处理对污泥厌氧消化的影响。实验结果表明,声强大于1 040W/m2时,用超声波处理污泥30m in以上,污泥絮体被打碎,污泥絮体结构遭到严重破坏,污泥中SCOD迅速增加,加速了污泥中有机质的水解反应;声强为2 000W/m2时,用超声波处理污泥60m in,中温((37±1)℃)厌氧消化10d,COD去除率为41%;厌氧消化25d的总产气量比未经超声波处理的污泥总产气量提高了53%;将发酵罐容积放大10倍,经超声波处理的污泥25d累积的总产气量比未经超声波处理的污泥总产气量提高了约25%。     

Local and regional air pollution in Ireland during an intensive aerosol measurement campaign

An intensive two month measurement campaign has been performed during a two year study of major component composition of urban PM10 and PM2.5 in Ireland (J. Yin, A. G. Allen, R. M. Harrison, S. G. Jennings, E. Wright, M. Fitzpatrick, T. Healy, E. Barry, D. Ceburnis and D. McCusker, Atmos. Res., 2005, 78(3-4), 149-165). Measurements included size-segregated mass, soluble ions, elemental carbon (EC) distributions, fine and coarse fraction organic carbon (OC) and major gases along with standard meteorological measurements. The study revealed that urban emissions in Ireland had mainly a local character and therefore were confined within a limited area of 20-30 km radius, without significantly affecting regional air quality. Gaseous measurements have shown that urban emissions in Ireland had clear, but fairly limited influence on the regional air quality due to favorable mixing conditions at higher wind speeds, in particular from the western sector. Size-segregated mass and chemical measurements revealed a clear demarcation size between accumulation and coarse modes at about 0.8 microm which was constant at all sites. Carbonaceous compounds at the urban site accounted for up to 90% of the particle mass in a size range of 0.066-0.61 microm. Nss SO4(2-) concentrations in PM2.5 were only slightly higher at the urban site compared to the rural or coastal sites, while NO3- and NH4+ concentrations were similar at the urban and coastal sites, but were a factor of 2 to 3 higher than at the rural site. OC was highly variable between the sites and revealed clear seasonal differences. Natural or biogenic OC component accounted for <10% in winter and up to 30% in summer of the PM2.5 OC at urban sites. A contribution of biogenic OC component to PM2.5 OC mass at rural site was dominant.