气溶胶水溶性无机物及有机物的离子色谱测定

利用离子色谱技术同时测定大气气溶胶中的水溶性有机物 (WSOC)与各种无机成分 ,检测出 1 2种无机离子 (F- ,Cl- ,NO-2 ,NO-3 ,SO2 -3 ,SO2 -4 ,PO3-4 ,Na ,NH 4,K ,Mg2 ,Ca2 )及 7种WSOC (甲酸、乙酸、甲磺酸、乙二酸、丙二酸、丁二酸、戊二酸 ) .该方法对无机离子的线性范围为 0 0 1— 1 0 0 0 μg·m- 3,有机物的线性范围为 0 0 0 5—1 0 μg·m- 3,相关系数除NH 4以外均高于 99 9% ,最低检测限为 0 0 0 0 1— 0 0 0 0 5 μg·m- 3,相对标准偏差为 0 43— 1 32 % .利用该技术 ,对北京市 2 0 0 1— 2 0 0 2年度大气PM2 5中水溶性物种的浓度水平进行了测定 .结果表明 ,北京市PM2 5中主要的水溶性组分为SO2 -4 ,NO-3 和NH 4,其浓度水平分别为 1 1 1 ,7 8和 6 2 μg·m- 3,各占PM2 5 质量的 1 0 6% ,7 4%及5 7% ,而WSOC的浓度水平为 0 0 1 1— 0 1 1 8μg·m- 3,占PM2 5质量浓度的 0 0 1— 0 1 % ,其中 ,乙二酸的浓度最高 ,其次为乙酸、丁二酸 ,丙二酸等 .     

基于ASM2的快速易生物降解COD组分表征方法构建

基于活性污泥2号模型（ASM₂）对快速易生物降解组分（S_S）进一步划分为可发酵的易生物降解有机物（S_F）和发酵产物（S_A）,本研究提出了一套科学的表征方法。该方法涉及S_S与X_S（慢速可生物降解组分）的好氧呼吸测量同时表征、S_A组分的离子色谱测定以及物料衡算。应用这套方法对重庆市某2个城市污水厂隔栅井出水水样平行进行了4组实验,各种组分测量值序列的CV值在2.09%～6.18%之间。     

Pollutant concentrations and pollution loads in stormwater runoff from different land uses in Chongqing

To investigate the distribution of pollutant concentrations and pollution loads in stormwater runoff in Chongqing,six typical land use types were selected and studied from August 2009 to September 2011.Statistical analysis on the distribution of pollutant concentrations in all water samples shows that pollutant concentrations fluctuate greatly in rainfall-runoff,and the concentrations of the same pollutant also vary greatly in different rainfall events.In addition,it indicates that the event mean concentrations (EMCs) of total suspended solids (TSS) and chemical oxygen demand (COD) from urban traffic roads (UTR) are significantly higher than those from residential roads (RR),commercial areas (CA),concrete roofs (CR),tile roofs (TRoof),and campus catchment areas (CCA);and the EMCs of total phosphorus (TP) and NH3-N from UTR and CA are 2.35-5 and 3 times of the class-III standard values specified in the Environmental Quality Standards for Surface Water (GB 3838-2002).The EMCs of Fe,Pb and Cd are also much higher than the class-III standard values.The analysis of pollution load producing coefficients (PLPC) reveals that the main pollution source of TSS,COD and TP is UTR.The analysis of correlations between rainfall factors and EMCs/PLPC indicates that rainfall duration is correlated with EMCs/PLPC of TSS for TRoof and TP for UTR,while rainfall intensity is correlated with EMCs/PLPC of TP for both CR and CCA.The results of this study provide a reference for better management of non-point source pollution in urban regions.     

大连湾海域营养盐时空分布、结构特征及其生态响应

基于2012年夏秋季大连湾海水中溶解态和不同粒级颗粒物中氮、磷、硅、叶绿素a的调查资料,对大连湾海水不同粒级颗粒物中营养盐和叶绿素a的时空分布特征进行了分析,对不同粒级浮游植物的营养要素组成及营养盐结构特征进行了探讨.结果表明,大连湾海水中溶解态营养盐、叶绿素a高值区主要出现在臭水套和甜水套湾附近海域,并由湾内向湾外递减,各粒级颗粒物中营养盐分布趋势存在着不一致性,但高值区易出现在西北部海域; 除无机氮外,海水中营养盐总体表现出秋季高于夏季,各粒级叶绿素a浓度表现为夏季高于秋季;磷是大连湾海水中浮游植物生长的限制元素,硅是不同粒级浮游植物营养盐的限制要素;微微型浮游植物对现有的营养结构更具适应性.     

The preparation and evaluation mechanism of mesoporous spherical silica/porous carbon-filled polypropylene composites obtained from coal gasification fine slag

Environmental Science and Pollution Research - Coal gasification fine slag is a by-product of the entrained-flow gasifier, which has caused some environmental pollution. Through acid dissolution...     

Development of Mg/La-layered double hydroxide nanocomposites and application of recovered phosphorus from modelled biogas slurry

Journal of Material Cycles and Waste Management - Presently, a large amount of agriculture-produced sewage generally contains excessive phosphorus discharge and water eutrophication. However, it is...