嘧草醚原药的高效液相色谱分析

[目的]建立一种用高效液相色谱测定嘧草醚的定量分析方法.[方法]采用C18色谱柱,以乙腈-水(体积比为60∶40)为流动相,流量为0.5 mL/min,柱温为30℃,选择254 nm为检测波长进行检测.[结果]方法的线性相关系数0.9998,标准偏差为0.33,平均回收率为100.30％.[结论]方法简便、快速、能进行准确定量分析,结果稳定.     

水杨腈的高效液相色谱分析

[目的]建立了一种用高效液相色谱测定水杨腈的定量分析方法.[方法]采用C18色谱柱,以乙腈-水(体积比48∶52)为流动相,流量为0.5 mL/min,柱温为30℃,选择230 nm为检测波长进行检测.[结果]方法的线性相关系数0.9997,标准偏差为0.20,平均回收率为99.8％.[结论]方法具有简便、快速、分离效果好、精密度和准确度高、线性关系好的特点.     

GC法快速测定代森锰锌原药中新增相关杂质乌洛托品(HMTA)

[目的]建立一种能够快速检测代森锰锌原药中乌洛托品(HMTA)杂质的气相色谱定量分析方法.[方法]使用DB-1701色谱柱和FID检测器,以邻苯二甲酸二乙酯为内标,测定代森锰锌原药中HMTA杂质的含量.[结果]HMTA的线性相关系数为0.9990,相对标准偏差为2.64％,平均回收率为91.51％.[结论]该方法操作简...     

离子色谱法测定草铵膦含量

[目的]建立草铵膦原药和草铵膦水剂的离子色谱定量分析方法.[方法]采用8 mol/L氢氧化钾水溶液为流动相,AS-11离子色谱柱(含AG-11保护柱)以及电导检测器对其有效成分草铵膦进行外标法定量分析.[结果]方法线性相关系数为0.9995(50～250 mg/L),标准偏差均小于0.08,变异系数均小于0.15％,平均回收率为100.26％.[结论]该方法可用于测定草铵膦原药或草铵膦水剂中的有效成分,具有精密、准确、简便易行的特点.     

高效液相色谱法测定乙烯菌核利的含量

[目的]建立一种使用高效液相色谱测定乙烯菌核利的定量分析方法.[方法]采用高效液相色谱,使用Eclipse XDB C8色谱柱,以乙腈-水(体积比80:20)为流动相,流速为1 mL/min,在205 nm波长下对乙烯菌核利进行定量分析.[结果]当乙烯菌核利质量浓度在1～50 mg/L范围内,方法的线性相关系数为0.999 95;标准偏差为0.122,变异系数为0.126％,平均回收率为99.63％.[结论]方法快速、准确,适用于乙烯菌核利的定量分析.     

肟菌酯原药高效液相色谱分析

[目的]建立一种采用高效液相色谱测定肟菌酯的定量分析方法.[方法]采用Agilent C18色谱柱和二极管阵列检测器,乙腈-甲醇-水(体积比55∶25∶20)为流动相,柱温40℃;流速1.0 mL/min,进样量5μL,在250 nm波长下对肟菌酯的有效成分进行外标法定量分析.[结果]方法线性相关系数为0.9999;变异系数分别为0.26％;平均回收率为100.3％.[结论]该方法可用于常规分析和质量控制研究,快速、简单,并具有良好的精度和可靠性.     

20.8％氟胺·烯禾啶乳油高效液相色谱分析

[目的]建立一种同时分析氟磺胺草醚和烯禾啶的高效液相色谱法.[方法]采用反相高效液相色谱法,以甲醇、水和磷酸为流动相,使用C18色谱柱和二极管阵列检测器,在280 nm波长下对试样中的氟磺胺草醚和烯禾啶进行分离和定量分析.[结果]氟磺胺草醚和烯禾啶的线性相关系数分别为0.9999、1.0000;标准偏差为0.067、0.061;变异系数为0.532％、0.727％;平均回收率为99.89％、99.69％.[结论]方法操作简单、快速、准确,适用于氟胺·烯禾啶乳油样品的定性和定量分析.     

百草枯水剂中臭味剂—烷基吡啶的分析

[目的]目前百草枯水剂中臭味剂的分析方法尚未见报道,随着百草枯水剂日益广泛的使用和愈发严格的市场监管,急需建立一个合适的分析方法.[方法]在碱性条件下,以甲苯为萃取剂萃取百草枯水剂中的臭味剂烷基吡啶.采用FID,HP-Innowax毛细管色谱柱,1,3,5-三甲苯为内标物,建立了气相色谱分析法.对萃取物中的3,5-二甲基吡啶、2,3-二甲基吡啶和3-乙基吡啶进行定量分析.[结果]方法的回收率在98％左右,标准偏差分别为0.0029、0.0020、0.0007,变异系数分别为0.0042％、0.0081％、0.0101％,线性相关系数均为1.[结论]该方法适用于百草枯水剂中烷基吡啶臭味剂的定量分析.     

40％环丙唑醇悬浮剂高效液相色谱分析

[目的]建立一种对40％环丙唑醇悬浮剂进行分离和测定的高效液相色谱分析方法.[方法]采用高效液相色谱法,以甲醇-超纯水为流动相,使用SunFire C18为填料的不锈钢色谱柱和PDA检测器,在220 nm波长下对供试物中的环丙唑醇进行分离和定量分析.[结果]该分析方法的环丙唑醇线性相关系数R2为0.999,标准偏差为0...     

气相色谱法测定土菌灵原药及相关制剂

旧的]为了更快更有效的检测土菌灵原药及相关制剂的有效含量.[方法]样品中加入乙腈溶解.采用气相色谱法,以DB-5为色谱柱,氦气作为载气,FID作为检测器,邻苯二甲酸二丁酯为内标溶液,进行检测.[结果]土菌灵含量成线性关系,回收率为95.20％～97.50％之间,相对标准偏差为0.52％～1.04％之间.[结论]该方法达...     

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.     

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.     

Inorganic/organic nanocomposite coatings: The next step in coating performance

Inorganic/organic hybrid materials have considerable promise and are beginning to become a major area of research for many coating usages, including abrasion and corrosion resistance. Our primary approach is to prepare the inorganic phase in situ within the film formation process of the organic phase. The inorganic phase is introduced via sol-gel chemistry into a thermosetting organic phase. By this method, the size, periodicity, spatial positioning, and density of the inorganic phase can be controlled. An important aspect of the inorganic/organic hybrid materials is the coupling agent. The initial task of the coupling agent is to provide uniform mixing of the oligomeric organic phase with the sol-gel precursors, which are otherwise immiscible. UV-curable inorganic/organic hybrid systems have the advantages of a rapid cure and the ability to be used on heat sensitive substrates such as molded plastics. Also, it is possible to have better control of the growth of the inorganic phase using UV curing. It is our ultimate goal to completely separate the curing of inorganic and organic phases to gain complete control over the morphology, and hence optimization of “all” the coating properties. Thus far, it has been found that concomitant UV curing of the inorganic and organic phases using titanium sol-gel precursors afforded nanocomposite coatings which completely block the substrate from UV light while maintaining a transparent to visible light. Also, it has been found that the morphology of the inorganic phase is highly dependent on the concentration and reactivity of the coupling agent. Presented at the 82nd Annual Meeting of the Federation of Societies for Coatings Technology, October 27–29, 2004, in Chicago, IL.     

Ethanol and (−)-α-Pinene: Attractant Kairomones for Some Large Wood-Boring Beetles in Southeastern USA

Ethanol and α-pinene were tested as attractants for large wood-boring pine beetles in Alabama, Florida, Georgia, North Carolina, and South Carolina in 2002–2004. Multiple-funnel traps baited with (−)-α-pinene (released at about 2 g/d at 25–28°C) were attractive to the following Cerambycidae: Acanthocinus nodosus, A. obsoletus, Arhopalus rusticus nubilus, Asemum striatum, Monochamus titillator, Prionus pocularis, Xylotrechus integer, and X. sagittatus sagittatus. Buprestis lineata (Buprestidae), Alaus myops (Elateridae), and Hylobius pales and Pachylobius picivorus (Curculionidae) were also attracted to traps baited with (−)-α-pinene. In many locations, ethanol synergized attraction of the cerambycids Acanthocinus nodosus, A. obsoletus, Arhopalus r. nubilus, Monochamus titillator, and Xylotrechus s. sagittatus (but not Asemum striatum, Prionus pocularis, or Xylotrechus integer) to traps baited with (−)-α-pinene. Similarly, attraction of Alaus myops, Hylobius pales, and Pachylobius picivorus (but not Buprestis lineata) to traps baited with (−)-α-pinene was synergized by ethanol. These results provide support for the use of traps baited with ethanol and (−)-α-pinene to detect and monitor common large wood-boring beetles from the southeastern region of the USA at ports-of-entry in other countries, as well as forested areas in the USA.