二氧化氯发生器产物成分的测定

就碘量法，ＤＰＤ光度法测定二氧化氯发生器产物成分的方法和特性进行了研究。结果表明：碘量法和ＤＰＤ光度法中用于二氧化氯发生器产物成分的测定，确定其产率，可为提高二氧化氯发生器的工作效率，调整工艺参数，降低运行费用提供依据。此外，ＤＰＤ光度法还可用于测定水中残余成分。     

稳定二氧化氯的制备与活化

二氧化氯是一种安全高效的消毒剂。采用碳酸钠和过氧化氢为稳定剂显著延长了二氧化氯溶液的保存时间,利用连续碘量法测定其有效成分的降解速度比普通的二氧化氯水溶液慢70％。同时通过研究多种酸性物质,确定盐酸作为稳定二氧化氯溶液的理想活化剂,活化时间为30min,活化率可达85％。     

复合二氧化氯消毒剂有效含量的定义

复合二氧化氯在饮用水消毒方面的应用越来越广泛,但消毒剂含量定义的问题一直争论不休。该文提出"总有效氯"为复合二氧化氯作为消毒剂中有效氯含量的定义,即pH在中性条件下,二氧化氯折算成氯的质量浓度乘以1(从ClO2还原到ClO2-,氧化价态变化值为1),再加上氯气质量浓度。"总有效氯"可用国标推荐五步碘量法的第一步(pH=7),方法应用简单、结果稳定、可靠。测定饮用水中余氯用DPD分光光度法比碘量法更好。如果二氧化氯与氯比值为1.0,则国标中的"有效氯"是"总有效氯"的2.3倍。     

软锰矿中MnO2含量的测定分析

本文根据软锰矿中MnO2含量的测定方法-碘量法，通过实验确定了测定软锰矿中MnO2含量的最佳条件，且酸用量对实验结果影响最大。对实际样品的测定分析表明，在此条件下测定的MnO2含量准确度较高。     

铜精矿中铜的检测方法改进及优化

建立碱熔融-碘量法测定铜精矿中铜含量的方法,试样先经碱熔融以消除干扰成分,再用碘量法测定其中铜的含量.对滴定条件及共存元素进行验证,确定最优实验条件.最优实验条件为选择混合碱溶剂,其中氢氧化钠与碳酸钠质量比为3:1,碱熔融温度为850℃,样品称样量为0.2000 g.在最优实验条件下,测定结果的相对标准偏差为0.24％...     

碘量法测定钠法次氯酸钙中有效氯含量

叙述了碘量法测定钠法次氯酸钙产品中有效氯的测试方法，反应原理，以及通过大量的实验确定了碘量法测定钠法次氯酸钙产品中有效氯含量的最佳的操作条件，验证了该方法的可行性。     

聚醚多元醇中过氧化物测定方法对比研究

聚醚多元醇中残留的过氧化物会导致反应活性下降从而严重影响其品质。分别采用碘量法和铈量法测定聚醚多元醇中的过氧化物含量，对两种测试方法的特点进行研究，并对相关测试条件如氧化反应时间、溶剂、指示剂等进行下游产品考察。研究结果表明：铈量法反应简单，副反应少，反应终点敏锐，对不同过氧化物含量的样品测定都适合；碘量法适宜的测试条件为氧化反应时间5～10 min,适用于过氧化物含量较低样品的检测。     

稳定性二氧化氯处理含酚废水的研究

利用稳定性二氧化氯对含酚废水的处理进行了研究，考察了稳定性二氧化氯的活化时间，废水pH值，处理温度和时间等因素对酚去除率的影响。结果表明，稳定性二氧化氯活化5～10min，在废水pH值小于8的范围内对酚的去除率无影响，低温下处理3h后也有较高的去除率。同时，实验得到了适宜的二氧化氯加入量和废水处理条件。     

二氧化氯对含酚和含硫化物工业废水处理的研究

利用稳定性二氧化氯分别对含酚和含硫化物工业废水的处理进行了研究，考察了稳定性二氧化氯的加入量，二氧化氯的活化时间，废水pH值，处理温度和处理时间等因素对废水处理效果的影响。实验得到了各种废水的适宜处理条件。     

稳定性固体二氧化氯消毒剂杀菌效果的研究

为了定量研究稳定性固体二氧化氯的杀菌效果,采用五步碘量法对实验室制取的稳定性固体二氧化氯消毒剂进行了有效成分的测定,并采用悬液定量杀菌法对其杀菌力做了系统的研究。实验选用大肠杆菌和金黄色葡萄球菌分别作为革兰氏阳性菌和革兰氏阴性菌的代表菌种,用含50、100、200mg/L的二氧化氯消毒剂的水溶液对实验菌作用1、3、5min,实验结果平均杀灭对数值均≥4.00。可以表明,该粉状消毒剂杀菌效果理想,对革兰氏阳性菌和革兰氏阴性菌均有良好的杀灭效果。     

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。