Reduced-glutathione concentrations in Boleophthalmus pectinirostris tissues exposed to benzo(a)pyrene

ＩｎｔｒｏｄｕｃｔｉｏｎＢｅｉｎｇａｔｙｐｉｃａｌｐｏｌｙｃｙｃｌｉｃａｒｏｍａｔｉｃｈｙｄｒｏｃａｒｂｏｎｓ(ＰＡＨｓ) ,ｂｅｎｚｏ[ａ]ｐｙｒｅｎｅ(ＢａＰ)ｄｅｓｅｒｖｅｓｓｅｒｉｏｕｓｓｔｕｄｙｂｅｃａｕｓｅＰＡＨｓａｒｅｎｏｗｒｅｃｏｇｎｉｚｅｄａｓｍａｊｏｒｅｎｖｉｒｏｎｍｅｎｔａｌｐｏｌｌｕｔａｎｔｓ .ＥｘｐｏｓｕｒｅｔｏＰａＨｓｉｓｖｉｒｔｕａｌｌｙｕｎａｖｏｉｄａｂｌｅａｎｄｉｓｓｔｒｏｎｇｌｙｓｕｓｐｅｎｄｅｄｏｆｂｅｉｎｇａｃａｕｓａｔｉｖｅｆａｃｔｏｒｉｎｃｅｒｔａｉｎｔｕｍｏ…     

Lipp制罐技术在污水处理工程应用中的建筑设计与施工

采用利浦 (Lipp)制罐技术应用于工业污水处理和城市污水处理工程当中在我国已逐步得到推广 ,并越来越显示出其优越性。阐述了与Lipp罐体相关的建筑设计与施工以及利浦技术在工程实践中应注意的问题。     

汽车工业规划环境影响评价指标体系研究

指标体系是战略环境评价的具体评价内容,即评价因子.本文根据汽车工业环境影响具有多领域、多成分、多层次立体交叉、时空范围广泛的特点,采用生命周期分析框架,系统识别汽车工业规划的环境影响因子;提出了指标的选取原则;基于生命周期分析框架对指标进行分类;以山东省汽车工业规划环境影响评价为例进行了实证研究.     

Speciation and fractionation of heavy metals in soil experimentally contaminated with Pb,Cd, Cu and Zn together and effects on soil negative surface charge

Speciation and fractionation of heavy metals in soil subsamples experimentally loaded with Pb, Cd, Cu and Zn in orthogonal design was investigated by sequential extraction, and operationally defined as water-soluble and exchangeable(SE), weakly specific adsorbed( WSA),Fe and Mn oxides-bound(OX) and organic-bound( ORG). The results showed that fractions of heavy metals in the soil subsamples depended on their speciation. About 90% of Cd and 75% of Zn existed in soil subsamples in the SE fraction. Lead and Cu existed in soil subsamples as SE, WSA and OX fractions simultaneously, although SE was still the major fraction. Organic-bound heavy metals were not clearly apparent in all the soil subsamples. The concentration of some heavy metal fractions in soil subsamples showed the good correlation with ionic impulsion of soil, especially for the SE fraction. Continuous saturation of soil subsamples with 0.20 mol/L NH4CI, which is the first step for determination of the negative surface charge of soil by the ion retention method, resulted in desorption of certain heavy metals from the soil. It was found that the percentage desorption of heavy metals from soil subsamples depended greatly on pH, the composition and original heavy metal content of the soil subsamples. However, most of the heavy metals in the soil subsamples were still be retained after multiple saturation. Compared with the parent soil, the negative surface charge of soil subsamples loaded with heavy metals did not show difference significantly from that of the parent one by statistical analysis. Heavy metals existed in the soil subsamples mainly as exchangeable and precipitated simultaneously.     

乌贼墨黑色素对Pb2+-Cu2+二元体系的吸附性能研究

为探索新型生物吸附剂，以乌贼墨黑色素（SIM）为吸附剂，研究Pb²⁺、Cu²⁺单组分溶液及Pb²⁺-Cu²⁺二元混合体系中SIM对Pb²⁺和Cu²⁺的吸附效果并构建等温吸附模型.结果表明，pH值、SIM添加量、吸附时间对SIM吸附Pb²⁺和Cu²⁺的吸附量影响较大，而吸附温度对吸附效果影响较小；单组分吸附与二元混合体系吸附对比表明，二元混合体系中Pb²⁺和Cu²⁺存在竞争吸附.应用L （Langmuir）和F （Freundlich）等温吸附模型拟合了SIM对Pb²⁺、Cu²⁺单组分金属离子的吸附过程，其中L模型与试验结果拟合度更高；应用Non-modified Langmuir、Modified Langmuir isotherm、Extended Langmuir、Extended Freundlich和SRS模型5种模型对Pb²⁺-Cu²⁺二元混合体系的等温吸附过程进行拟合，其中Extended Langmuir模型与试验结果拟合度最佳.应用红外光谱（FTIR）分析SIM吸附金属离子的原理时发现，SIM上羟基、-NH和不饱和键是金属离子的吸附位点，且SIM对Pb²⁺的吸附能力优于对Cu²⁺的吸附.     

肇庆市大气降水pH值的灰色预测

利用灰色系统理论中的GM(1,1)模型建立了肇庆市大气降水pH值的预测模型,经检验该模型精度较高.在此基础上对肇庆市今后几年的大气降水pH值进行了预测.     

改性PAC的制备及在废水处理工艺中的应用

针对几种典型的工业废水处理工艺,指出采用传统PAC混凝剂的不足,提出PAC混凝剂制备的一些改良方法及在废水处理工业中的应用,其中包括对聚合氯化铝的合成工艺的改进,在聚合氯化铝的制造过程中,引入一种或一种以上的阴离子,依据协同增效的原理,将聚合铝与一种或一种以上的其他物质进行复合而得到新型高效混凝剂.     

类-Fenton体系对水中17β-雌二醇的光降解

以250W照明金属卤化物灯为光源研究了水中17β雌二醇(E2)在类Fenton体系中的光降解。结果表明,Fe(Ⅲ)/H2O2体系能有效地光降解E2。pH3～6范围内,E2光降解率及反应初始速率随酸度的增大而增大;H2O2初始浓度越大,E2降解率及反应初始速率越大;E2初始浓度越低,E2降解率越高,反应初始速率越低。     

炭素焙烧炉沥青烟净化处理

采用干式静电除尘技术,对炭素焙烧炉排放的含有烟尘、沥青烟的工业废气进行处理,达到既能高效净化有害气体,又能降低资金投入。处理后的各项指标为:烟尘排放浓度=20.0mg/m3,沥青烟排放浓度=14.2mg/m3,苯并(a)芘排放浓度=0.054×10-3mg/m3,所有污染物均达到排放标准。     

雌酮在铁(Ⅲ)-草酸盐配合物体系中的光降解

以125 W高压汞灯为光源,研究了水中雌酮(E1)在铁(Ⅲ)-草酸盐体系中的光降解;考察了初始pH值、铁(Ⅲ)/草酸盐配比、E1初始浓度对E1光降解的影响.结果表明,铁(Ⅲ)/草酸盐体系能引发E1的光降解.在pH=3.5,Fe(Ⅲ)/Ox配比为10/120μmol/L时,2 mg/L E1光照160 min可以降解59%.在pH 3～6范围内,pH为3～4时E1降解效率最高;在2～10 mg/L范围内,光降解效率随水溶液中E1初始浓度的增加而降低.