紫外-可见分光光度法测定噻唑磷含量

建立紫外-可见分光光度法测定噻唑磷含量的方法.溶剂为正己烷,测定波长为213.9 nm,样品质量浓度为36.375 mg/L.采用对照比较法计算含量.噻唑磷在23.92～95.68 mg/L质量浓度范围内呈线性关系线性相关系数为0.9996.精密度实验RSD不超过0.74%,准确性分析表明噻唑磷的回收率在100.21%～101.16%之间.     

气相色谱法测定噻唑磷的含量

建立了气相色谱法测定噻唑磷含量的方法,色谱柱为HP-5,FPD检测器,进样口和汽化室温度250℃,程序升温,不分流进样.对照品的进样量在5.98～53.82 mg/L时,峰面积与进样量呈良好的线性关系,线性相关系数为0.9997,噻唑磷的回收率在97.85%～101.85%之间,相对标准偏差为2.19%.     

比浊法测定含铜基体样品中的微量氯

本文研究了比浊法测定含铜基体样品中微量cl一的快速分析方法.方法液体最低检出浓度为0.2mg·L-1,固体最低检出浓度为5μg·g-1.测定含Cl-为0.0014%,0.0058%,0.0070%的CuSO4,CuCO3·Cu(OH)2和CuO样品,相对标准偏差分别为4.5%,3.2%,2.4%;加标回收率分别为98.2%～105.1%,98.8%～107.6%,96.4%～105.5%.     

气相色谱测定土壤中霜霉威的残留

应用气相色谱氮磷检测器对土壤中霜霉威的残留量进行了测定,方法的最低检出量为1 × 10-10g,最低检出质量分数为0.03 mg/kg,在0.051、0.51、1.02 mg/kg添加水平下,添加回收率范围为91.21%～99.96%,变异系数范围为2.24%～5.39%.     

菠菜中噻虫嗪的残留检测与消解动态

采用高效液相色谱分析技术测定了噻虫嗪在菠菜中的残留动态和最终残留.噻虫嗪的最低检出量为1 ng,最低检出质量分数为0.002 mg/kg.在菠菜中的平均回收率为90.5%～101.4%,相对标准偏差0.75%～1.21%.噻虫嗪在土壤和菠菜中的半衰期分别为2.3 d.按180 g/hm2剂量施药3 d后,菠菜中最高残留量为0.55 mg/kg.     

氟草烟在稻田水及土壤中残留分析方法

通过衍生化反应和气相色谱检测来测定稻田水、土壤样品中氟草烟的残留.氟草烟的最小检出量为2.0×10-12g,最低检出质量分数稻田水中为0.001 mg/kg、土壤中为0.002 mg/L.稻田水中氟草烟的平均添加回收率为96.16%～103.20%,变异系数为2.34%～6.97%;土壤中的平均添加回收率为81.35%～94.27%,变异系数为4.26%～6.52%.     

氟啶脲在冬枣中的残留检测及消解动态

采用高效液相色谱法测定了氟啶脲在冬枣中的残留动态.氟啶脲的最低检出量为4.45 ng,最低检出质量分数为0.04 mg/kg.在冬枣中的平均回收率为71.3%～91.7%,相对标准偏差为0.95%～5.23%,符合农药残留分析的要求.实验结果表明:氟啶脲在冬枣中的半衰期为3.1 d,原始沉积量为0.95 mg/kg.按0.05 g/kg药液质量浓度施药7 d后,冬枣中最高残留量为1.37 mg/kg.     

高效液相色谱法同时测定甘蔗及土壤中莠灭净与敌草隆的残留

建立了用高效液相色谱法同时测定甘蔗及土壤中莠灭净与敌草隆的残留分析方法.样品经甲醇提取,二氯甲烷萃取和中性氧化铝柱层析净化,HPLC法测定,方法最小检出量莠灭净为1.2×10-9g,敌草隆为1.5×10-9g.莠灭净在土壤和甘蔗中的最低检出质量分数分别为0.015、0.02 mg/kg,方法添加回收率分别为82.12%～90.97%、85.89%～92.26%,相对标准偏差分别为1.70%～5.73%、0.40%～5.78%;敌草隆在土壤和甘蔗中的最低检出质量分数分别为0.01、0.02 mg/kg,方法添加回收率分别为80.93%～82.19%、81.81%～87.81%,相对标准偏差分别为2.34%～8.60%,0.35%～6.20%.     

12%噻虫嗪·噻唑磷颗粒剂的高效液相色谱分析

采用高效液相色谱法测定12%噻虫嗪·噻唑磷颗粒剂中噻虫嗪和噻唑磷的质量分数,使用C18反相柱和紫外可变波长检测器,以乙腈+0.3%冰乙酸水溶液为流动相,用外标法对有效成分进行分析和定量。结果表明,噻虫嗪和噻唑磷的线性相关系数分别为0.999 3和0.999 4,标准偏差分别为0.056、0.140,变异系数分别为2.68%、1.35%,平均回收率分别为100.05%、99.74%。     

HPLC法测定10%噻唑磷颗粒剂含量

建立了高效液相色谱法测定10%噻唑磷颗粒剂有效成分含量的方法。采用岛津CLC-ODS(150 mm×6.0 mm,5μm)色谱柱;柱温为30℃;流动相为V(甲醇)∶V(水)=65∶35;流速为1.0 mL/min;检测波长为220 nm;噻唑磷保留时间为7.0 min。结果表明标准样品溶液进样量在0.053 5～0.855 8 mg/mL时线性关系良好(r=0.999 9、n=5),平均回收率为99.12~99.96%,RSD为0.23%。该方法专属性强,重现性好,准确度高,可用于10%噻唑磷颗粒剂有效成分的含量测定。     

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.