三氟百菌清的气相色谱分析

采用HP-5毛细管色谱柱,以联苯为内标物,用FID检测器对三氟百菌清原药进行定量分析方法研究.进样口温度:240℃,检测器温度:240℃,柱箱温度:170℃,方法的变异系数为0.41%,回收率为98.6%～101.0%.     

工业用95%乙醇分离及杂质峰的定性分析

采用气相色谱分离法,热导池检测器对工业用95%乙醇进行分离和杂质峰的定性分析。色谱条件:柱温140℃,汽化室温度200℃,检测器温度200℃,固定液选用聚乙二醇20000,三氯乙烯为溶剂等。结果表明,工业用95%乙醇的色谱峰分离效果非常理想,乙醇含量95%,水约5%。     

气相色谱法测定乳康颗粒中乙酸辛酯的含量

建立乳康颗粒中乳香有效成分乙酸辛酯含量的检测方法.运用安捷伦色谱柱DB-WAX(30 mm×0.32 mm×0.50μm)和FID检测器(氢火焰离子化检测器),在检测器温度为300℃,气化室温度为290℃,色谱柱初始温度为50℃,维持1 min,以10℃/min的速率升至200℃,保持8 min,气体流量为氮气30.0...     

气相色谱法测定环己酮中的微量轻组分

采用气相色谱法测定环己酮中微量轻组分含量,探讨了色谱柱、柱温、气化温度、检测温度、载气流量对环己酮及其组分色谱分离的影响。结果表明:选用强极性毛细管色谱柱AB-Wax 60 m×0.32 mm×0.5μm,采用程序升温法,以升温速率20℃/min升温至色谱柱初始温度100℃,保持时间10 min,再以10℃/min升至色谱柱终温150℃,保持时间30 min,在进样口温度为250℃,氢火焰离子化检测器温度为280℃,载气为氮气,流量为1.5 mL/min,进样量为0.6μL的条件下,采用气相色谱仪测定环己酮中微量轻组分含量,环己酮中微量轻组分能得到很好地分离,通过峰面积外标法定量,测定结果的加标回收率为96.3%～97.2%,相对标准偏差为0.86%～1.13%。     

气相色谱法测定凝胶洗手液中乙醇含量

采用氢火焰气相色谱法(GC-FID)对凝胶洗手液中乙醇含量的测试,验证凝胶洗手液中乙醇含量检测方法的适用性,采用直接法进样,色谱柱为HP-INNOWAX毛细管色谱柱(30 m×0.25 mm,0.25μm),载气为氮气,氢火焰离子化检测器,进样口温度为230℃;检测器温度为250℃;起始温度60℃保持5 min,以40℃/min升温至230℃保持8 min。乙醇含量线性范围在5～20 mg/mL,相关系数r=0.99994,加标回收率在99.6%～101.9%之间。     

毛细管气相色谱法定量分析二甲戊灵

采用HP–5石英毛细管色谱柱和FID检测器,以邻苯二甲酸二戊酯为内标物,在适宜的色谱条件下对二甲戊灵原药进行定量分析。色谱条件为柱箱采用程序升温,200℃保持0.5min,以10℃/min速率升至240℃,保持2.5min;进样口温度260℃,检测器温度250℃,气体流速为载气(N2)1mL/min,燃气(H2)30mL/min,助燃气(Air)350mL/min,分流比1∶40。本方法的变异系数0.0779%,平均回收率100.06%,标准偏差为0.074,线性相关系数为0.9999。     

气相色谱法测定1,2-丙二胺的含量

用OV-1毛细管色谱柱和氢火焰离子化检测器,以邻二甲苯为内标物,测定1.2-丙二胺的含量。确立了色谱分析最佳条件为:进样口温度:200℃;FID检测器温度:200℃;柱温:恒温100℃。结果表明,此方法线性较好,相关系数为0.9998,标准偏差为0.21~0.27,变异系数为0.49%~0.66%,平均加标回收率为100.26%。实验证明本方法操作简单、快速、重复性较好。     

0.8%四氟菊酯驱蚊药液的毛细管柱气相色谱分析

描述了用毛细管气相色谱对0．8%四氟菊酯驱蚊药液的定量分析方法。样品溶于含内标物邻苯二甲酸二正戊酯的异丙醇中，用DB-1毛细管分离并用带有火焰离子化检测器的气相色谱测定四氟菊酯。气化室温度：230℃；检测器温度：300℃；柱箱温度：起始温度100℃；升温速率15℃／min；终止温度28℃，保持时间10min。方法的变异系数为6．4%，回收率在92%～108%之间。     

气相色谱法测定环己酮氨肟化反应尾气中的氨气

采用气相色谱法测定了环己酮氨肟化反应尾气中氨气含量,探讨了气相色谱操作条件,并与奥氏气体化学吸收法进行了比较。结果表明:采用Porapark Q,Porapark N混合色谱柱,柱温80℃,汽化温度120℃,检测温度150℃,检测器为热导检测器,桥流100 mA,载气为H2,流量为25 mL/min,以外标法定量,能够准确测定环己酮氨肟化反应尾气中的氨气;该方法的回收率为97.6%～100.5%,相对标准偏差为0.46%～0.92%;该方法较奥氏气体化学吸收法误差小、准确度高。     

气相色谱法测定氯乙酸乙酯的含量

用OV-1701毛细管色谱柱和氢火焰离子化检测器,以邻二甲苯为内标物,测定合成医药、农药及香料的重要中间体氯乙酸乙酯的含量。确立了色谱分析最佳条件为:进样口温度:200℃;FID检测器温度:200℃;柱温:恒温100℃。结果表明,此方法线性较好,相关系数为0.9999,标准偏差为0.15~0.84,变异系数为0.24%~1.04%,平均加标回收率为100.32%。实验证明本方法操作简单、快速、稳定性和重复性都较好。     

Insect antifeedant properties of anthranoids from the genusVismia

Vismiones and ferruginins, representatives of a new class of lypophilic anthranoids from the genusVismia were found to inhibit feeding in larvae of species ofSpodoptera, Heliothis, and inLocusta migratoria.     

Direct observation of freeze-thaw instability of latex coatings via high pressure freezing and cryogenic SEM

Despite its industrial importance, the subject of freeze-thaw (F/T) stability of latex coatings has not been studied extensively. There is also a lack of fundamental understanding about the process and the mechanisms through which a coating becomes destabilized. High pressure (2100 bar) freezing fixes the state of water-suspended particles of polymer binder and inorganic pigments without the growth of ice crystals during freezing that produce artifacts in direct imaging scanning electron microscopy (SEM) of fracture surfaces of frozen coatings. We show that by incorporating copolymerizable functional monomers, it is possible to achieve F/T stability in polymer latexes and in low-VOC paints, as judged by the microstructures revealed by the cryogenic SEM technique. Particle coalescence as well as pigment segregation in F/T unstable systems are visualized. In order to achieve F/T stability in paints, latex particles must not flocculate and should provide protection to inorganic pigment and extender particles. Because of the unique capabilities of the cryogenic SEM, we are able to separate the effects of freezing and thawing, and study the influence of the rate of freezing and thawing on F/T stability. Destabilization can be caused by either freezing or thawing. A slow freezing process is more detrimental to F/T stability than a fast freezing process; the latter actually preserves suspension stability during freezing. Presented at the 82nd Annual Meeting of the Federation of Societies for Coatings Technology, October 27–29, 2004 in Chicago, IL. Tied for first place in The John A. Gordon Best Paper Competition.     

Ethanol and (−)-α-Pinene: Attractant Kairomones for Bark and Ambrosia Beetles in the Southeastern US

In 2002–2004, we examined the flight responses of 49 species of native and exotic bark and ambrosia beetles (Coleoptera: Scolytidae and Platypodidae) to traps baited with ethanol and/or (−)-α-pinene in the southeastern US. Eight field trials were conducted in mature pine stands in Alabama, Florida, Georgia, North Carolina, and South Carolina. Funnel traps baited with ethanol lures (release rate, about 0.6 g/day at 25–28°C) were attractive to ten species of ambrosia beetles (Ambrosiodmus tachygraphus, Anisandrus sayi, Dryoxylon onoharaensum, Monarthrum mali, Xyleborinus saxesenii, Xyleborus affinis, Xyleborus ferrugineus, Xylosandrus compactus, Xylosandrus crassiusculus, and Xylosandrus germanus) and two species of bark beetles (Cryptocarenus heveae and Hypothenemus sp.). Traps baited with (−)-α-pinene lures (release rate, 2–6 g/day at 25–28°C) were attractive to five bark beetle species (Dendroctonus terebrans, Hylastes porculus, Hylastes salebrosus, Hylastes tenuis, and Ips grandicollis) and one platypodid ambrosia beetle species (Myoplatypus flavicornis). Ethanol enhanced responses of some species (Xyleborus pubescens, H. porculus, H. salebrosus, H. tenuis, and Pityophthorus cariniceps) to traps baited with (−)-α-pinene in some locations. (−)-α-Pinene interrupted the response of some ambrosia beetle species to traps baited with ethanol, but only the response of D. onoharaensum was interrupted consistently at most locations. Of 23 species of ambrosia beetles captured in our field trials, nine were exotic and accounted for 70–97% of total catches of ambrosia beetles. Our results provide support for the continued use of separate traps baited with ethanol alone and ethanol with (−)-α-pinene to detect and monitor common bark and ambrosia beetles from the southeastern region of the US.     

Methyl 2,4,6-decatrienoates Attract Stink Bugs and Tachinid Parasitoids

Halyomorpha halys (Stål) (Pentatomidae), called the brown marmorated stink bug (BMSB), is a newly invasive species in the eastern USA that is rapidly spreading from the original point of establishment in Allentown, PA. In its native range, the BMSB is reportedly attracted to methyl (E,E,Z)-2,4,6-decatrienoate, the male-produced pheromone of another pentatomid common in eastern Asia, Plautia stali Scott. In North America, Thyanta spp. are the only pentatomids known to produce methyl 2,4,6-decatrienoate [the (E,Z,Z)-isomer] as part of their pheromones. Methyl 2,4,6-decatrienoates were field-tested in Maryland to monitor the spread of the BMSB and to explore the possibility that Thyanta spp. are an alternate host for parasitic tachinid flies that use stink bug pheromones as host-finding kairomones. Here we report the first captures of adult and nymph BMSBs in traps baited with methyl (E,E,Z)-2,4,6-decatrienoate in central Maryland and present data verifying that the tachinid, Euclytia flava (Townsend), exploits methyl (E,Z,Z)-2,4,6-decatrienoate as a kairomone. We also report the unexpected finding that various isomers of methyl 2,4,6-decatrienoate attract Acrosternum hilare (Say), although this bug apparently does not produce methyl decatrienoates. Other stink bugs and tachinids native to North America were also attracted to methyl 2,4,6-decatrienoates. These data indicate there are Heteroptera in North America in addition to Thyanta spp. that probably use methyl 2,4,6-decatrienoates as pheromones. The evidence that some pentatomids exploit the pheromones of other true bugs as kairomones to find food or to congregate as a passive defense against tachinid parasitism is discussed.     

2007～2008年世界塑料工业进展

收集了2007年7月～2008年6月世界塑料工业的相关资料,介绍了2007～2008年国外塑料工业的发展情况,提供了世界塑料产量、消费量及全球各类树脂的需求量及产能情况.按通用热塑性树脂(聚乙烯、聚丙烯、聚苯乙烯、聚氯乙烯、ABS树脂)、工程塑料(尼龙、聚碳酸酯、聚甲醛、热塑性聚酯、聚苯醚)、特种工程塑料(聚苯·硫醚、液晶聚合物、聚醚醚酮)、通用热固性树脂(酚醛、聚氨酯、不饱和聚酯树脂、环氧树脂)不同品种的顺序,对树脂的产量、消费量、供需状况及合成工艺、产品应用开发、树脂品种的延伸及应用的进一步扩展等技术作了详细介绍.     

2005～2006年国外塑料工业进展

收集了2005年7月～2006年6月国外塑料工业的相关资料,介绍了2005—2006年国外塑料工业的发展情况。提供了世界塑料产量、消费量及全球各类树脂生产量以及各国塑料制品的进出口情况。作为对比,介绍了中国塑料的生产情况。按通用热塑性树脂（聚乙烯、聚丙烯、聚苯乙烯、聚氯乙烯、ABS树脂）、工程塑料（聚酰胺、聚碳酸酯、聚甲醛、热塑性聚酯、聚苯醚）、通用热固性树脂（酚醛、聚氨酯、不饱和树脂、环氧树脂）、特种工程塑料（聚苯硫醚、液晶聚合物、聚醚醚酮）的品种顺序,对树脂的产量、消费量、供需状况及合成工艺、产品开发、树脂品种的延伸及应用的扩展作了详细的介绍。