棉铃宝高效液相色谱分析方法研究

本法采用同一色谱条件反相高效液相色谱法测定棉铃宝中甲基对硫磷和辛硫磷的含量，方法简单易行，具有较高的精密度和准确度，其回收率分析为甲基对硫磷９９．５９％，辛硫磷１０１．０％。     

三唑磷的气相色谱分析

用３％ＯＶ－１０１的气相色谱填充柱，以邻苯二甲酸双环己酯为内标，用具有氢焰离了化检测器的气相色谱仪对三唑磷原药和油进行了定量分析。原药和乳油的标准偏差分别为０．３和０．２，变异系数分别为０．４％和０．７％，方法的平均回收率为９９．７％，此法操作简便、变量准确。     

杀扑磷及其乳油的气相色谱分析

采用气相色谱法，使用ＯＶ－１０１色谱柱和氢火焰离子化检测器，以癸二酸二正丁酯为内标物，对杀扑磷及其乳油进行色谱分离和测定。方法的变异系数为０．２２％，线性相关系数为０．９９９９８，回收率达９９．０９％－１００．３５％之间。     

吡虫啉原药的液相色谱分析

本文采用反相液相色谱法，选择Ｃ１８色谱柱，以乙腈，甲醇和水为流动相，２６７纳米检测，外标法测定吡虫啉原药的含量。该方法操作简便，快速，准确，其变异系数为０．３９％，标准偏差为０．３３，平均回收率为９９．５８－１０１．２％，线性相关系数为０．９９９５。     

气相色谱法测定有机磷杀虫剂噁唑磷

采用气相色谱法在５％ＯＶ－１０１／ＣｈｒｏｍｏｓｒｂＷ－ＡＷＤＭＣＳ色谱柱上分离和测定有机磷杀虫剂恶唑磷含量。该方法操作简便、快速、准确可靠。对同一试样的５次平行独立测定的标准偏差为０．１５，变异系数为０．５５％；并且，标准加入法回收率达９８．２０％～１０２．４％。     

甲氰菊酯的气相色谱分析

用３％ＯＶ－１０１的气相色谱填充柱，以磷酸三苯酯为内标，用具有氢焰离子化检测器的气相色谱仪对甲氰菊酯原药和乳油进行了定量分析。原药和乳油的标准偏差分别为０．５９和０１１，平均变异分别为０．６５％和０．５２％，平均回收率分别１００．２％和９９．２％，此法操作简便，定量准确。     

20%辛氰乳油的高效液相色谱分析

本文用高效液相色谱法，采用Ｌｉｃｈｒｏｓｏｒｂ Ｓｉ－６０色谱柱，以乙醚／石油醚（１．４／９８．６）为流动相，邻苯二甲酸二异辛酯为内标，在同一色谱条件下同时测定２０％辛氰乳油中辛硫磷与氰戊菊酯的含量。本方法快速而准确，辛硫磷和氰戊菊酯的变异系数分别为０．８１％与０．３１％，平均回收率分别可达９８．７４％与９９．９０％。     

久效磷原药的液相色谱分析

本文采用液相色谱法，选择Ｃ１８色谱柱，甲醇水为流动相，２４０纳米检测，外标法宣，标准偏差０．３５，变异系数０．４５％，回收率平均值９９．８７％。     

溴丙磷的气相色谱分析

采用气相色时测定溴丙磷原药及制剂的含量，选用５％ＯＶ－１０１／Ｇａｓ Ｃｈｒｏｍ Ｑ色谱柱，以邻苯二甲酸二丁酯为内标物，三氯甲烷为溶剂，用氢火焰离子化检测器测定，其回收率在９８．６￣１００．４％，原油和乳油的变异系数分别为０．４２％和０．４８％。     

稻谷中残留马拉硫磷气相色谱法测定

本文讨论了马拉硫磷的性质及稻谷中残留马拉硫磷的气相色谱测定方法，标准偏差和变异系数为０．５、０．５％，回收率可达９８．５８￣１０１．２％。     

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.     

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。     

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.