EDTA选择滴定法测定易熔合金中的镉

在弱酸性溶液中邻菲咯啉与镉（Ⅱ）形成无色可溶性配合物，其稳定性高于相对应的乙二胺四乙酸（EDTA）配合物，在镉（Ⅱ）的EDTA配合物溶液中加入掩蔽剂邻菲咯啉，则配合物分解。通过铅（Ⅱ）标准溶液滴定释放出的EDTA可测定镉（Ⅱ）的含量。     

以L—半胱氨酸为掩蔽剂配位滴定法测定铜

在弱酸性溶液中,Ｌ－半胱氨酸与铜（Ⅱ）形成无色可溶性配合物,其稳定性高于相对应的乙二胺四乙酸（ＥＤＴＡ）配合物。在铜（Ⅱ）的ＥＤＴＡ配合物溶液中加入掩蔽剂Ｌ－半胱氨酸,则配合物分解。通过以铅（Ⅱ）标准溶液滴定释放出的ＥＤＴＡ,可测定铜（Ⅱ）的含量。     

以L—半胱氨酸为掩蔽剂配位滴定法测定铜

在弱酸性溶液中，Ｌ－半胱氨酸与铜（Ⅱ）形成无色可溶性配合物，其稳定性高于相对应的乙二胺四乙酸（ＥＤＴＡ）配合物。在铜（Ⅱ）的ＥＤＴＡ配合物溶液中加入掩蔽剂Ｌ－半胱氨酸，则配合物分解。通过以锅（Ⅱ）标准溶液滴定释放出的ＥＤＴＡ，可测定铜（Ⅱ）的含量。     

锌（Ⅱ）-色氨酸-邻菲咯啉配合物的合成及其与DNA的作用和生物毒性研究

合成了一种新的锌（Ⅱ）-色氨酸-邻菲咯啉配合物[Zn（Trp）（phen）2]Cl·7H2O（Ⅰ）（Trp为L-色氨酸离子,phen为邻菲咯啉）。通过元素分析、红外光谱及热重一差热分析对其进行了结构表征。采用电子吸收光谱法、荧光光谱法及琼脂糖凝胶电泳法考察了其与DNA的作用,研究了配合物对斑马鱼胚胎的生物毒性,并与2种已知结构的锌-邻菲咯啉配合物[zn（phen）2]Cl2·5H2O（Ⅱ）和[zn（phen）]Cl2（Ⅲ）进行了比较。结果表明,配合物与鲑鱼精DNA作用大小顺序为配合物Ⅰ〉配合物Ⅱ〉配合物Ⅲ．但作用方式不同;在抗坏血酸存在下,配合物Ⅰ对pBR322DNA的切割作用最强;配合物对斑马鱼胚胎毒性作用大小顺序为配合物Ⅱ〉配合物I〉配合物Ⅲ。     

邻菲咯啉衍生物钌配合物的制备及性能研究

钌-邻菲咯啉配合物已经广泛应用于电化学、光化学领域,以羟基苯基并[4,5]-邻菲咯啉（Hpip）为配体,合成二氯化三羟基苯基并[4,5]-邻菲咯啉钌（Ru（Hpip）3Cl2）。应用红外、紫外和荧光光谱对产物进行表征,用循环伏安法考察其电化学行为,研究pH、氧对其荧光强度的影响。结果表明Ru（Hpip）3Cl2在玻碳电极上有准可逆的电化学行为,在溶液中其对氧的响应倍数（I0／I）高达11．9。     

含柔性插入配体的钌（Ⅱ）配合物的合成及其与DNA作用研究

设计合成一个柔性插入配体dcpip（dcpip=2-（2,3-环己烯基眯唑并[4,5-f]邻菲咯啉）及其钌（Ⅱ）多吡啶配合物[Ru（bpy）2（dcpip）]（ClO4）2（bpy=2,2＇-联吡啶）和[Ru（phen）2（dcpip）]（ClO4）2（phen=1,10-邻菲咯啉）。采用元素分析和质谱对其进行表征。用电子吸收光谱、荧光光谱和粘度测试研究配合物与DNA作用。研究结果表明,配合物与DNA之间通过插入作用结合。     

置换螯合滴定在测定锌白粉及玻璃中氧化锌的应用

在含有锌离子及其他多种金属离子的溶液中，加入过量的ＥＤＴＡ溶液，调节溶液的ｐＨ值，使所有金属离子与ＥＤＴＡ定量螯合，然后加入邻菲谵啉置换剂，选择性地定量置换Ｚｎ－ＥＤＴＡ螯合物中的ＥＤＴＡ，从而间接得到试样中氧化锌的含量。此法选择性好，操作简便快速，具有良好的准确度和精密度。     

EDTA直接法测定Ln（NO3）3—邻二氮菲—氟脲嘧啶中稀土含量的研究

研究了在配体邻二氮菲及氟脲嘧啶存在下，直接用ＥＤＴＡ容量法测定稀土硝酸盐—邻二氮菲—氟脲嘧啶配合物（［Ｌｎ（Ｐｈｅｎ）２（Ｆｕ（ＮＯ３）］（ＮＯ３）２）（Ｌｎ＝稀土元素）［１］，终点颜色变化敏锐，结果准确。     

配合物NdL_3·Phen·H_2O的合成及性质研究

合成了ＮｄＬ３·Ｐｈｅｎ·Ｈ２Ｏ（Ｌ＝对甲氧基苯甲酸根,Ｐｈｅｎ＝邻菲啉）固体配合物,对所合成的配合物进行了元素分析,摩尔电导率,ＩＲ,ＵＶ－ＶＩＳ,１ＨＮＭＲ,ＴＧ－ＤＴＡ等的分析测试,初步研究了配合物的组成结构和性质。     

二氰基二硫纶·邻菲咯啉-5,6-二酮混配锰(Ⅱ)、铁(Ⅱ)、钴(Ⅱ)配合物的感光氧化特性

测定了二氰基二硫纶·邻菲咯啉-5,6-二酮混配锰(Ⅱ)、铁(Ⅱ)、钴(Ⅱ)配合物MLL'(M=Mn2+、Fe2+、Co2+；L=mnt2-,1,2-二氰基乙烯-1,2-二硫醇离子；L'=phen-5,6-dione,1,10-邻菲咯啉-5,6-二酮)在二甲基亚砜(DMSO)、丙酮(Acet)和氯仿(CHCl3)中的电子...     

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。