溴苯腈高效液相色谱分析方法的研究

介绍除草剂溴苯腈的高效液相色谱分析方法.选用Nova-PakC18[150×3.9m m(i.d)]反相色谱柱,采用外标法进行定量分析测定.该方法操作简便,快速,准确,方法回收率在99.62%～100.13%之间,标准偏差小于0.28,变异系数优于0.30%.     

10%氯噻啉可湿性粉剂的高效液相色谱分析

采用甲醇+水为流动相,用反相高效液相色谱和紫外检测器分离测定氯噻啉可湿性粉剂有效成分。结果表明,方法的标准偏差为0.05,变异系数为0.44%,平均回收率为100.13%,线性相关系数为0.999 8。     

三唑醇的高效液相色谱分析

采用SSI-Kromasil C18色谱柱,以甲醇和水为流动相,在276 nm紫外波长下对三唑醇原药进行反相高效液相色谱法测定,原药有效成分的保留时间约为6.2 min。以外标法面积定量测得本方法的变异系数为0.62%,平均回收率为100.13%,线性相关系数为1.0000。     

HPLC-MS/MS法同时测定水体中残杀威和高效氯氰菊酯含量

利用高效液相色谱-三重四极杆质谱仪建立水体中残杀威和高效氯氰菊酯含量检测方法。采用高效液相色谱-串联质谱法,以乙腈-5 mmol/L乙酸铵水溶液(90%+10%)为流动相,使用以Eclipse Plus C₁₈填充的色谱柱和质谱检测器,对水体中的残杀威和高效氯氰菊酯进行测定,外标法定量。结果表明：残杀威和高效氯氰菊酯分别在0.94～47.10、0.63～31.29μg/L质量浓度范围内线性关系良好,相关系数分别为0.9991和0.9994,变异系数分别为0.52%和2.05%,高质量浓度水平的平均回收率分别为102.26%和102.44%,低质量浓度水平的平均回收率分别为90.74%和98.24%。该方法具有操作简便、分离效果好、快速等优点,线性关系、准确度、精密度和灵敏度均满足要求,可用于水体中残留检测和水生生态环境毒理研究。     

25%苯噻草胺·吡嘧磺隆泡腾片剂高效液相色谱分析方法研究

采用高效液相色谱法对苯噻草胺和吡嘧磺隆混合制剂作定量分析,变异系数分别为0.99%和1.08%;标准偏差分别为0.2420和0.0114;回收率分别为99.21%～100.21%和99.52%～100.16%.     

0.4%氯菊酯·氯氰菊酯水乳剂的液相色谱分析

介绍了用高效液相色谱法,采用Hypersil SiO2色谱柱,以异辛烷+1,4-二氧六环为流动相,在230nm下检测,外标法定量分析氯菊酯和氯氰菊酯的方法.方法的标准偏差分别为0.0084和0.0084,变异系数分别为4.0%和3.8%,回收率分别为99.31%～100.36%和98.32%～100.09%.     

甘氨酸的反相高效液相色谱分析方法的研究

建立了一种用高效液相色谱法测定甘氨酸的定量分析方法,采用美国SIELC primesep 100色谱柱（250 mm×4.6mm、5μm）,以乙腈/水（10/90）为流动相（用磷酸调节pH=2.0）,选择200nm为检测波长进行检测,表明方法的标准偏差为0.18,变异系数为0.23%,相关系数为0.9999,平均回收率100.13%。方法具有快速、简便、准确、重现性好等特点。     

胺菊酯·高效氯氰菊酯气雾剂的气相色谱分析

介绍了 0 .2 8 %胺菊酯·高效氯氰菊酯气雾剂的气相色谱分析方法。选用 5 %SE - 30 ChromsorbWAW -DMCS(15 0～ 180um)色谱柱 ,以邻苯二甲酸二正辛酯为内标物进行定量分析测定 ,该方法简单、快速、准确、适用。结果表明胺菊酯和高效氯氰菊酯的标准偏差分别为 0 .2 4 %和 0 .11% ;变异系数分别为 0 .94 %和 1.74 % ;平均回收率分别为 99.6 4 %和 99.95 % ;线性回归系数分别为 0 .9999和 0 .9998。     

虫酰肼·辛硫磷可湿性粉剂的高效液相色谱分析

叙述了采用高效液相色谱法测定虫酰肼·辛硫磷粉剂的含量的方法。该方法的标准偏差分别为0.10,0.28,变异系数分别为2.68,1.70,平均回收率分别为98.2%～100.4%及98.6%～100.1%,方法线性关系良好,其相关系数分别为0.99996,0.99993。     

贵州铜仁植烟土壤高效氯氰菊酯和甲氨基阿维菌素苯甲酸盐残留状况研究

本研究分别建立了气相色谱-质谱法和液相色谱-质谱法测定植烟土壤中高效氯氰菊酯和甲维盐残留的方法,评估了铜仁市植烟土壤中高效氯氰菊酯和甲维盐的残留状况。试验结果表明,高效氯氰菊酯和甲维盐的质量浓度分别为50～1 000μg/L和0.5～20μg/L时,其对应的分析方法具有良好的线性关系,检出限分别为5μg/kg和0.125μg/kg;分别在0.02～0.15μg/g和0.5～80μg/g范围内,平均回收率为83.9%～100.5%和96.4%～102.5%,相对标准偏差为3.96%～6.43%和1.96%～8.79%。55个植烟土壤中未检测到甲维盐,有1个土壤样品中检出了高效氯氰菊酯,残留量为0.44 mg/kg。铜仁烟区土壤中高效氯氰菊酯和甲维盐残留量较低,具有发展低残留优质烟叶的优越条件。     

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。