36%敌·三唑乳油的气相色谱法测定

采用程序升温的气相色谱法,以邻苯二甲酸二乙酯为内标,测定36%敌·三唑乳油中的敌百虫和三唑磷的含量。敌百虫和三唑磷的分析标准偏差和变异系数分别为0 13、1 38%和0 09、0 42%,回收率分别为97 2%～102 6%和97 5%～100 8%,线性相关系数分别为0 99977,0 99925。     

20%三唑·辛乳油的液相色谱分析

论述了在同一液相色谱条件下对 2 0 %三唑·辛乳油中的三唑磷、辛硫磷进行定量分析的方法。采用反相柱分离 ,三元混合流动相 (甲醇 +水 +磷酸 =70 +30 +0 0 5 (v/v) )进行洗脱 ,可变波长紫外检测器在波长 2 5 4nm条件下进行检测 ,外标法定量。三唑磷和辛硫磷的变异系数分别为 0 2 9%、 0 6 8% ;回收率分别为 97 81%～ 10 2 15 %和 99 2 8%～ 10 0 99% ;线性相关系数分别为 0 9998和 0 9999。     

30%毒·灭乳油(顽虫净)高效液相色谱分析

采用反相高效液相色谱法 ,以甲醇 +水 =70 +30 (v/v)为流动相 ,用紫外检测器对毒死蜱·灭多威乳油进行分离和测定。结果表明 :毒死蜱和灭多威含量测定的精密度标准偏差分别为0 0 7和 0 0 5 ;变异系数分别为 0 35 %和 0 5 0 % ,回收率分别为 98 99%～ 10 1 0 2 %和 99 6 4%～10 1 95 % ,线性相关系数分别为 0 9999和 0 9996。     

三唑磷·毒死蜱乳油的液相色谱分析

以ODS色谱柱,UV246 nm为检测波长,用甲醇:水=90∶10(V/V)作为流动相,在ODS色谱柱上同柱液相色谱法测定三唑磷、毒死蜱的含量。方法的变异系数三唑磷为0.41%,毒死蜱为0.35%,三唑磷的回收率为98.9~100.7%,毒死蜱回收率为99.5%~100.6%。相关系数三唑磷为0.9968,毒死蜱为0.9999。     

20%氟·唑磷乳油复配制剂分析方法的研究

介绍了杀虫剂三唑磷和氟虫腈复配乳油制剂的液相色谱分析方法。选用Hypersil ODS250mm×4.0mm5 μm 不锈钢色谱柱、配置紫外检测器(VWD) 及自动进样器的HP 1100高效液相色谱仪,进行液相色谱分离和测定。该方法操作简便、快速、准确。结果表明三唑磷和锐劲特的标准偏差分别为0.106 6 和0.012 6,变异系数分别为0.565 8%和1 .228%,平均回收率分别为99.00%和99.80%,线性相关系数分别为0.999 9 和0.999 7。     

不同影响因子对20%三唑磷微乳剂的影响

研究了不同影响因子对20%三唑磷微乳剂的影响.结果表明:对于20%三唑磷微乳剂,乙醇是较合适的助溶剂,用量6%;三唑磷原药中的稳定剂醋酸酐用量超过1.0%后,对微乳剂生成影响明显;双性乳化剂602P和阴离子表面活性剂605#-Na复合乳化剂效果最好,用量约11%;使用碳酸氢铵等稳定剂,产品在弱碱性pH值7～10条件下贮存,具有较好的稳定作用,有效成分相对分解率2.0%以内.     

40%毒死蜱·三唑磷水乳剂的研究

40%毒死蜱·三唑磷水乳剂的配方组成:毒死蜱20%,三唑磷20%,油溶剂二甲苯10%,十二烷基苯磺酸钙3.6%,苯乙烯基苯酚甲醛树脂聚氧乙烯嵌段聚醚5.4%,乙二醇4%,正丁醇3%,自来水34%。产品热贮[(54±2)℃,14 d]分解率小于5%,经时稳定性好;田间药效试验结果表明,每公顷施药600~750 mL,防效达95%以上。     

高效液相色谱法测定三唑磷微乳剂

采用高效液相色谱法测定三唑磷。方法的标准偏差为 0 0 5 ,变异系数为 0 5 8% ,线性相关系数 0 9998,回收率为 98 9%～ 10 0 7%。     

蜱·阿维乳油的HPLC分析方法研究

本文建立了蜱·阿维乳油的高效液相色谱分析法。在Nova-PakC1 8柱上 ,用甲醇 水 乙酸 (85 1 5 0 .1 )为流动相 ,检测波长 2 50nm。毒死蜱和阿维菌素两种待测组分的峰面积与浓度呈良好的线性关系 ,相关系数分别为 0 .9998和 0 .9988,回收率在 96.4%～ 1 0 0 .7% ,变异系数分别为 0 .9%和 0 .2 % ,实现了毒死蜱和阿维菌素在相同条件下的分离分析 ,适合于生产控制和产品质量分析。     

40%三唑磷水乳剂的配方研究

介绍了40%三唑磷水乳剂的配制方法。通过对乳化剂、稳定剂等助剂的筛选,确定了40%三唑磷水乳剂最佳配方为:40%三唑磷、8%～10%二甲苯、3%环氧氯丙烷、4.5%WELL-106S、4.5%WELL-303、2%稳定剂B、0～0.1%黄原胶、0～0.1%苯甲酸钠、0.3%消泡剂,去离子水补足至100%。结果表明,制得的40%三唑磷水乳剂的热贮分解率小于5%,各项指标均符合水乳剂的要求。     

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。