高效液相色谱直接光学拆分手性农药(英文)

Enantiomer separation is one of the most important prerequisites for the investigation of environmental enantioselective behavior for chiral pesticides.The enantiomeric separation of three chiral pesticides,indoxacarb,lambda-cyhalothrin,and simeconazole,were studied on cellulose tris-(3,5-dimethylphenyl-carbamate)-coated chiral stationary phase(CDMPC-CSP) using high-performance liquid chromatography under normal phase condition.The effects of chromatographic conditions,such as the mobile phase composition including the concentration and type of alcohol modifiers in hexane,flow rate and column temperature,on enantiomer separation were examined.The thermodynamical mechanism of enantioseparation and chiral recognition mechanism were discussed.Better separation were achieved using 20% n-propanol for indoxacarb,2% iso-butanol for lambda-cyhalothrin,and 20% iso-propanol for simeconazole as modifiers in hexane at 25℃ with the selectivity factor(a) of 1.69,1.82 and 1.70,respectively.The resolution factor(Rs) decreased as the flow rate increased from 0.4 to 1.1 ml·min-1.The retention factor(k’) and selectivity factor for the enantiomers of analytes decreased as temperature increased.The lna-1/T plots for racemic chiral pesticides were linear in the range of 15-35℃ in hexane/iso-propanol and the chiral separation was controlled by enthalpy.Hydrogen bonding,π-π and dipole-dipole interactions between enantiomers and CDMPC-CSP play an important role in chiral identification,and the fitting of the asymmetric portion of solutes in a chiral cavity or channel of the CSP is also important.     

抗副溶血弧菌海洋微生物的筛选、鉴定及抑菌谱研究

该研究采用平板涂布法和平板划线法从印度洋沉积物中分离纯化海洋微生物,以副溶血弧菌（Vibrio parahemolyticus）为指示菌,采用平板划线法对拮抗菌株进行初筛,琼脂扩散法进行复筛,并通过形态观察、生理生化试验和分子生物学技术对其进行菌种鉴定,并研究其抑菌谱。结果表明,从印度洋沉积物中共分离纯化出115株微生物,经过初筛,得到10株有抑制效果的拮抗菌,经过复筛得到1株对副溶血弧菌有较好抑制效果的菌株,编号为NO.5.10.1-1,抑菌圈直径为（18.50±0.28） mm,该菌被鉴定为中村芽孢杆菌（Bacillus nakamurai）。除金黄色葡萄球菌（Staphylococcus aureus）外,该菌对7株致病菌均有抑制作用,具有较广的抑菌谱。     

伯胺萃取法生产无铁硫酸铝工艺研究

介绍了用伯胺直接从铝土矿的硫酸浸取液中萃取分离铁生产无铁硫酸铝的工艺研究内容和结果,并介绍了工艺技术经济状况。     

除氧器“安全阀”泄漏原因分析及改进

对海渤湾发电厂自１９９４年投产以来除氧器安全安全阀频繁发生泄漏进行了技术分析,并采取了相应的措施,有效地抑制了除氧器安全阀的泄漏,保证了除氧器的安全经济稳定运行 。     

北京市大中型水库下游河道行洪能力分析——以怀柔水库为例

大中型水库在发生超标准洪水时，下游河道及两岸保护区会面临巨大的洪水风险。为保障河道行洪安全，需要对河道行洪能力进行分析，确定其过流能力及阻水建筑物对行洪的影响。以怀柔水库下游主河道怀河为例，利用一二维水动力模型，阐述了如何构建数值模型，设置合适的模拟方案并分析方案结果。结果显示了怀河的具体行洪能力，并针对怀河上阻水建筑物的影响做了进一步的研究，结果表明阻水建筑物会对河道水位及漫堤后的淹没范围造成不利影响，壅高水位并增大淹没面积，为保障行洪安全应尽量减少阻水建筑物，避免不利影响。