聚磷酸铵中缩二脲含量的测定

参照尿素中缩二脲含量的测定方法 (分光光度法),加入适量的氢氧化钠溶液,调节聚磷酸铵溶液至碱性,建立了聚磷酸铵中缩二脲含量的检验方法。该方法的相对标准偏差1.88%,加标回收率为96.40%~102.40%,测定结果与高效液相色谱法一致,准确度高,重现性好。     

氟甲砜霉素分析方法研究

分别采用紫外分光光度法、高效液相色谱法、电位滴定法对氟甲砜霉素注射液进行分析方法研究,建立了紫外分光光度法及高效液相色谱法测定氟甲砜霉素含量的分析方法.该方法操作简单,快速,准确,重现性良好,适用于氟甲砜霉素注射液含量的快速检测.     

紫外-可见分光光度法测定盐酸氟桂利嗪胶囊的含量

为了建立盐酸氟桂利嗪生产过程中的快速分析方法,采用紫外-分光光度法和高效液相色谱法对盐酸氟桂利嗪进行测定。对比结果表明,以盐酸为溶剂,选择253 nm为测定波长,在盐酸氟桂利嗪为7.488～17.472μg.mL-1的浓度范围内,紫外-分光光度法与高效液相色谱法具有很好的可靠性,可以作为生产过程质量控制的快速测定方法。     

复混肥料（复合肥料）中缩二脲含量的测定

范围 本标准规定了复混肥料（复合肥料）中缩二脲含量测定的试验方法：液相色谱法、分光光度法。本标准适用于基础肥料中含有尿素的复混肥料（复合肥料）中缩二脲含量的测定。规范性引用文件下列文件中的条款通过本标准的引用而成为本标准的条款。凡是注日期的引用文件,其随后所有的修改单（不包括勘误的内容）或修订版均不适用于本部分,然而,     

两种测定硫酸双氢链霉素中杂质链霉素含量的方法比较

本文主要对硫酸双氢链霉素中杂质链霉素的含量测定进行方法研究,分别采用了高效液相色谱法和紫外分光光光度法进行方法学研究,并对结果进行判断比较,证明了高效液相色谱法代替紫外分光光度法测定硫酸双氢链霉素中杂质链霉素的含量是可行的。     

阿司匹林肠溶片含量测定方法比较

分别采用酸碱滴定法、紫外分光光度法和高效液相色谱法对规格为25 mg阿司匹林肠溶片进行了测定。结果表明:由于辅料的影响,酸碱滴定法测定值严重偏高;紫外分光光度法测定值比较稳定,精密度高,测定值符合要求;高效液相色谱法测定值符合要求,但对仪器精度要求高。结论是酸碱滴定法不适用于小剂量阿司匹林肠溶片含量测定。     

水中甲醛含量的测定方法研究

参照乙酰丙酮分光光度法检测水中甲醛含量和高效液相色谱法检测环境空气中醛类化合物的方法,制定出一种高效液相色谱法检测水中甲醛含量的方法。方法检测限为0.0015μg/m L,平均回收率为99.73%,准确度良好。同时将该法与乙酰丙酮分光光度法进行比较,发现高效液相色谱法不受其他醛类的干扰,结果相对更加可靠准确,因此适用于准确度要求较高的水中甲醛含量的测定。     

紫外分光光度法和高效液相色谱法检测食品塑料包装中荧光增白剂

比较紫外分光光度计法和高效液相色谱法对荧光增白剂的检测。使用氨水处理塑料包装样品,分别使用紫外分光光度计和高效液相色谱检测其中的荧光增白剂,比较两者回收率、精密度和检出限。经统计学分析紫外分光光度计法和高效液相色谱法不是等精密度检测,紫外分光光度计法回收率为95.7%~102.4%,精密度(相对标准偏差)为2.49%,检出限为0.06 mg/kg;高效液相色谱法回收率为98.8%~102.3%,精密度(相对标准偏差)为1.15%,检出限为0.03 mg/kg。紫外分光光度计法和高效液相色谱法都可以满足对塑料中的荧光增白剂进行常规检测的要求,高效液相色谱法的精度更高。     

中药材中维生素C含量测定方法的对比分析

通过对比分析的方法,确定在不同的中药材中维生素C含量的测定方法。将五味子、枸杞、山楂、大枣等药材进行研究,采用紫外分光光度法、二氯靛酚滴定法和高效液相色谱法3种方法进行维生素C的测定,对测定的过程和结果进行分析,选择最合适的维生素C测定的方法。结果表明,采用高效液相色谱法对维生素C进行测定的准确性最高,滴定法最简单,但是测试的结果不是特别准确,特别在测试颜色较深的样品中误差偏大。紫外分光光度法测定的结果与其他的两种方法比偏高,容易受到杂质的影响。高效液相色谱法在对中药中的维生素C测定中最合适,滴定法的局限性比较多,只能对颜色较浅的样品进行测定,紫外分光光度法在维生素C含量测定中不合适。     

硫化胶中防老剂NLB含量的测定

试验研究高效液相色谱法和紫外分光光度法测定硫化胶中防老剂NLB含量。结果表明，两种方法均可用于硫化胶中防老剂NLB含量的测定，回收率较高DCP硫化体系硫化胶中防老剂NLB含量测定结果较硫黄硫化体系偏低。高效液相色谱法因具有分离功能，测定结果准确性高，适于各种老化处理后的硫化胶样品测定；紫外分光光度法不适用于油介质老化的硫化胶样品测定。     

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.