孔雀绿分光光度法测定炭素制品中微量铅的研究

采用分光光度法来测定炭素制品中微量铅的含量。经比较实验确定了该方法最佳的实验奈件。该方法操作简便、快速、检出限低、灵敏度高，是检测微量铅含量一种较理想的方法。     

低压开车法在CO2气提法尿素装置的应用

介绍了低压开车法在改进型CO2气提法尿素装置中的实际应用，总结了低压开车法的优点，论述了低压投料的技术要点和措施，给出了开车过程曲线及技术数据。     

改进β-紫罗兰酮的合成方法

以氢氧化锂/助催化剂为催化剂体系,柠檬醛为原料合成β-紫罗兰酮。此催化剂体系有良好选择性,用量少、成本低、对环境污染小。同时对反应溶剂、温度、反应时间等因素进行优化,使其适用于工业生产,最终摩尔收率可达86%以上。     

Effects of the electrospray ionization parameters on the formation and morphology of colloidal microspheres of polyacrylonitrile

Polyacrylonitrile colloidal microspheres have been successfully prepared with different concentrations of electrospraying polyacrylonitrile solutions. The morphology of the colloidal spheres has two kinds of structures and is strongly affected by electrospray‐ionization parameters, such as the polymer concentration, applied voltage, and distance between the electrodes. The solvent can also affect the morphology of polyacrylonitrile. The optimum conditions for preparing colloidal spheres have been found, and differential scanning calorimetry results indicate that polyacrylonitrile colloid spheres are amorphous. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 2889–2893, 2006     

双环戊二烯改性不饱和聚酯树脂的研究

探讨了双环戊二烯改性不饱和聚酯树脂的各种影响因素及其合成的主要工艺条件。当顺酐和苯酐的物质的量的比为0.22;双环戊二烯和总酸的物质的量的比为0.15;催化剂用量为0.24%;苯乙烯用量为30%～35%;封端温度控制在155℃;加成时间为3h时,合成的树脂具有良好的气干性。     

日本水处理混凝剂行业考察

日本在水处理混凝剂研发、生产、管理和应用方面都具有国际先进水平。介绍了日本水处理主宴混凝剂——聚氯化铝（PAC）和硫酸铝（AS）的产业现状，新混凝剂聚硅氯化铁的研发推广工作，水处理药剂标准的制定和管理，以及混凝剂的生产应用效果。文中有详尽的统计资料，可供中国水处理行业参考。     

Self-assembly and crystallization behavior of a double-crystalline polyethylene-block-poly(ethylene oxide) diblock copolymer

The self-assembly and crystallization behavior of a well-defined low molecular weight polyethylene-block-poly(ethylene oxide) (PE-b-PEO) diblock copolymer was studied. The number-average degrees of polymerization for the PE and PEO blocks were 29 and 20, respectively. The molecular weight distribution was 1.04 as determined by size-exclusion chromatography. The PE-b-PEO sample exhibited two melting points at 28.7 and 97.4 °C for the PEO and the PE crystals, respectively. The crystallization of the PE blocks was unconfined, while the crystallization of the PEO blocks was confined between pre-existing PE crystalline lamellae, as demonstrated by simultaneous small-angle X-ray scattering (SAXS) and wide-angle X-ray diffraction (WAXD) studies. In the fully crystalline state, both PE and PEO blocks formed extended-chain crystals with PE chains tilted ∼22° from the lamellar normal and PEO chains parallel to the lamellar normal, as evidenced by two-dimensional WAXD study of shear-oriented samples. Regardless of hydrogen bonding among hydroxyl chain ends in the PEO blocks, interdigitated, single-crystalline layer morphology was observed for both PE and PEO crystals. The partial crystalline morphology, where the PE crystallizes and the PEO is amorphous, had the same overall d-spacing as the fully crystalline morphology. A double-amorphous PEO layer sandwiched between neighboring PE crystalline layers was deduced based on a chain conformation study using Fourier transform infrared. The confined crystallization kinetics for PEO blocks was investigated by differential scanning calorimetry, which could be explained by a heterogeneous nucleation mechanism. The slower crystallization rate in the PEO-block than the same molecular weight homopolymer was attributed to the effects of nanoconfinement and PEO chains tethered to the PE crystals.     

产地不同的两种香蓼的挥发性成分研究

本文通过分析检索,从香蓼1#样中鉴定出33个挥发性成分,从香蓼2#样中鉴定出36个挥发性成分。1#样中主要有十二烷醛、癸醛、草蒿脑、石竹烯氧化物、十二烷醇、癸醇等。2#样中主要有十二烷醛、癸醛、十三碳烯、十二烷醇等。二者相同的化学成分有17种,主要是癸醛、十二烷醛、十二烷醇等。     

离子色谱法测定配煤、焦炭和焦油中的氯含量

研究了用带电导检测器的离子色谱对配煤、焦炭和焦油中的Cl- 进行测定的方法。在YSA型8126A-4# 阴离子分离柱上用3.5mmol/LNa2CO3、5.3mmol/LNaHCO3做淋洗液对Cl-进行测定,方法简便快速。Cl-的检出限为2×10-6。该法也适用于F-、NO2-、NO3-、SO42-等的测定。     

南水北调中线总干渠水质变化趋势及污染源分析

为了解和掌握南水北调中线总干渠水质状况,依据总干渠26个常规水质断面监测数据,分析了总干渠沿程水质变化趋势。结果表明,主要污染指标(CODMn、氨氮、总氮和总磷)呈现出沿程增加趋势。根据影响总干渠水质的潜在影响因素,分析了7类污染源(直接水污染、大气粉尘沉降、桥面雨水污染、底泥污染、周边垃圾场淋溶液污染、雨洪污染、受污染地下水)及其可能对干渠水质产生的影响程度,并针对不同污染源提出了防控对策,供管理部门决策参考。