二安替比林对氯苯基甲烷与钒的显色反应研究

以正交设计法试验研究了二安替比林对氯苯基甲烷试剂分光光度法测定微量钒的最佳显色条件。最佳显色条件为 :(1+5 ) H3PO4 用量为 4 .0 0 m L,0 .2 m ol· L- 1 Mn( )的用量为 2 .0 0 m L,10 g· L- 1 Tween80用量为 2 .0 0 m L ,2 g· L- 1 DAPCM用量为 3.0 0 m L ,加热温度为 90℃ ,加热时间为 5 5 m in,最大吸收波长为 4 85 nm。V( )在 0 .2 0～ 5 .0 0 μg· (2 5 m L) - 1范围内呈良好线性关系 ,线性回归方程为 A=0 .92 11+0 .35 14 C[μg· (2 5m L) - 1 ],线性相关系数 r=0 .9979,摩尔吸光系数 ε=1.0 3× 10 6 [L· (mol· cm) - 1 ]。本法应用于猪骨中钒 ( )的测定 ,结果满意     

催化动力学光度法测定痕量钒(Ⅴ)的研究

研究了在 p H=4及没食子酸存在下 ,微量钒 ( )催化溴酸钾氧化邻苯二胺的动力学条件 ,建立了催化动力学光度法测定痕量钒 ( )的新方法。方法的测定范围为 0～ 0 .0 2 5 μg· 2 5 m L- 1 ,检出限为 1.18× 10 - 6 g·L- 1 ,相对标准偏差为 4 .6 3% (n=10 ) ,线性回归方程为△ A=2 5 .6 6 c(μg· 2 5 m L- 1 ) - 0 .0 15 7(r=0 .9997) ,表观摩尔吸光系数ε4 6 0 nm=3.2 7× 10 7L· m ol- 1 · cm- 1 。该法灵敏度高 ,选择性好 ,直接应用于水样和食品样中痕量钒( )的测定 ,结果满意     

正交设计试验研究二安替比林对乙氧基苯基甲烷与钒(Ⅴ)的超高灵敏显色反应

以正交试验设计法研究了二安替比林对乙氧基苯基甲烷 (DAp EM)试剂与微量钒 ( )的超高灵敏显色反应 ,建立了测定钒 ( )的新体系。该体系的灵敏度为 ε=8.30× 10 6 L· mol- 1· cm- 1 ,线性范围为 2 .0 0～ 10 .0μg· L- 1 ,对测定 0 .2 0 μg· (2 5 m L) - 1 V( ) ,抗主要离子干扰量为 :Fe3+ ,Cu2 + (10 μg) ;Ce( ) (5 μg) ;F- (0 .5μg)。与单因素轮换法建立的体系相比 ,灵敏度和选择性有了很大的改善。该方法测定中草药样品中微量钒 ( )含量 ,结果满意     

2-(3-羧基-2,4,5-三氮唑偶氮)-5-乙酰氨基苯酚的合成及其与钴的显色反应研究

合成了新试剂 2 -(3 -羧基 -2 ,4,5 -三氮唑偶氮 ) -5 -乙酰氨基苯酚 (CTZAAP) ,并研究了其与钴的显色反应及应用。在 p H7.61的 Na H2 PO4 -Na2 HPO4 缓冲液中该试剂与钴形成 2∶ 1红色稳定配合物 ,λmax为 5 2 9.2 nm,钴量在 0～ 1 .2 μg·m L- 1 范围内符合比尔定律 ,表观摩尔吸光系数为 4.61× 1 0 4 L· mol- 1 · cm- 1 。方法用于维生素 B1 2 注射液及环境水样中的微量钴测定 ,结果满意     

4,5-二溴邻硝基苯基荧光酮分光光度法测定微量镍

研究了在表面活性剂 CTMAB存在下 Ni( )与 4,5 -二溴邻硝基苯基荧光酮( DBONPF)的显色反应。在 p H为 8.8～ 1 0 .0的缓冲介质中 ,Ni( )与 DBONPF形成 1∶ 3蓝色配合物 ,其最大吸收波长 60 6nm,表观摩尔吸光系数ε=1 .1 0× 1 0 5L· mol- 1· cm- 1,Ni( )含量在 0～ 2 0 0μg· L- 1范围内符合比尔定律 ,是光度法测定镍的高灵敏体系之一。用拟定方法测定钢铁中的微量镍 ,结果满意。     

分光光度法测定海带中的碘

讨论了用碘 -淀粉体系分光光度法测定海带中微量碘含量的方法。本实验以 Na NO2 作为氧化剂 ,使用淀粉作为显色剂 ,测得吸光度与含碘溶液浓度成线性关系 ,可检测范围为 0 .4～ 7μg· m L- 1 ,回收率为 85 %～12 0 % ,摩尔吸光系数为ε=1.2 6× 10 4 L· m ol- 1 · cm- 1 。该法具有准确度高 ,重现性好 ,简便快速的特点 ,是测定海藻中微量碘的一种较理想的方法     

钯-对二甲氨基亚苄基罗丹宁-乳化剂OP体系光度法测定痕量钯(Ⅱ)的研究及应用

在 0 .2 m ol· L- 1的硝酸介质中 ,在表面活性剂乳化剂 - OP存在下 ,Pd2 +与对二甲氨基亚苄基罗丹宁形成橙红色络合物 ,最大吸收波长为 490 nm,ε=3.2× 10 4,Pd2 +浓度在 0～ 1.6 μg· m L- 1范围内符合比尔定律 ,测定了络合物的组成比。方法已用于电镀废液中钯的测定 ,结果较为满意。     

高效液相色谱法测定从酚焦油裂解液中回收的苯乙酮含量

报道了高效液相色谱法测定苯酚焦油裂解液中苯乙酮的含量。采用SpherisorbC18色谱柱(2 5 0mm× 4 .6mm ,5 μm) ,乙腈 /水 /醋酸 (体积比 6 0 :39:1)为流动相 ,流速 1.0mL·min-1,检测波长 2 4 5nm。结果表明 :苯乙酮在 0 .5～ 10 2× 10 -3 g·L-1浓度范围内线性关系良好 (r =0 .9998) ,RSD不大于 1.1%。该法操作简单、快速、准确 ,适合于苯酚焦油中回收苯乙酮的生产过程分析和成品质量检验。     

焦磷酸盐电镀锡-锌合金

1　工艺特点本工艺以弱碱性焦磷酸盐为络合剂电镀Zn Sn合金 ,它具有镀液成分简单、操作工艺流程短、便于管理、镀液温度范围宽、镀液稳定性好、电流效率高、分散能力好等优点 ,它的最大特点是可在氯化钾镀锌层上电镀Zn Sn合金 ,镀层色泽带青白色与铬相似 ,可作小装饰件上的代铬层。2　工艺配方焦磷酸钾 / g·L- 12 5 0～ 30 0氯化亚锡 / g·L- 12 0～ 2 5氯化锌 / g·L- 115～ 2 0SZ开缸剂 /mL·L- 110～ 2 0SZ Ⅰ /mL·L- 115～ 2 5SZ Ⅱ /mL·L- 115～ 2 5pH值 8.5～ 9.5θ/℃ 10～ 4 5JK/A·cm- 2 0 .1～ 0 .5阳极 (0 #Sn∶0 #…     

氨基三溴苯基荧光酮化学发光法测定维生素B_(12)中的钴

用氨基三溴苯基荧光酮 (ATB- PF)为化学发光剂建立了与 CTMAB- H2 O2 化学发光法测定的新体系 ,线性响应范围为 5× 1 0 - 10～ 2× 1 0 - 8g· m L- 1,检测限为 4× 1 0 - 11g· m L- 1,应用于维生素 B12 样品的测定 ,结果满意。     

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。