EDTA络合滴定钙,镁方法的改进

研究了用改进的ＥＤＴＡ络合滴定直接测定钙，镁的方法，即用乙酰丙酮掩蔽镁测定钙和用草酸钙沉淀除钙后直接测定镁的方法，结果表明，该新方法简单，快速，准确度和精密度高。     

EDTA络合滴定钙、镁方法的改进

研究了用改进的ＥＤＴＡ络合滴定直接测定钙、镁的方法,即用乙酰丙酮掩蔽镁测定钙和用草酸钙沉淀除钙后直接测定镁的方法。结果表明,该新方法简单、快速、准确度和精密度高。     

浓海水综合利用中钙镁分离新技术研究

对浓海水综合利用中钙镁分离新技术进行研究，试验了苛化+碳化除钙镁，草酸/草酸钠混合液选择性除钙两种方案，并对加入比例、pH、钙镁浓度变化等方面进行了探索。得出结论：1)苛化+碳化的方法除钙镁，相对传统化学沉淀法，原料便宜，而且耦合了热电烟道气减碳，副产的硫酸钙、氢氧化镁、碳酸钙纯度高更有利于制备高附加值产品。2)采用草酸/草酸钠混合液选择性除钙，效率高、反应快，除钙后溶液可以再次反渗透或者热法浓缩，超浓缩液再去原料便宜处集中提镁、提钙或直接应用，此工艺对于单独浓海水提镁制备高端镁产品可以消除钙的影响，同时对于浓海水软化+浓缩制盐可以大大节省原料费用和设备费用。     

对硝水除钙镁生产工艺的研究

通过硝水除钙镁试验和生产运行，说明用石灰氮渣除镁、用碳酸氢钠除钙是一种较理想又实用的硝水除钙镁生产的新工艺。     

关于联碱系统母液Ⅱ澄清除镁的试验研究

阐述了MⅡ温度对除镁的影响，当温度在40℃时其溶解度是20℃时的2倍左右，因此，选择较低的温度有利于除镁。试验表明：在温度一定的条件下，除镁效果受停留时间的影响，MⅡ停留时间在10．5h以上时，除镁效果较好。加滤网比不加滤网效果好些。     

国产磷酸二铵对作物产量,土壤肥力的影响

富含钙、镁、硫等中量营养元素的国产 Ｄ Ａ Ｐ与美国产 Ｄ Ａ Ｐ进行对比试验研究，在等 Ｎ、等 Ｐ２ Ｏ５ 条件下，对大豆和玉米的作物产量、收获后的土壤肥力、投入产出比等指标进行分析，表明富含钙、镁、硫的国产 Ｄ Ａ Ｐ具有显著的优越性     

高镁菱锌矿制硫锌和氧化镁工艺研究

高镁菱锌矿用盐酸浸取，氧化、除欠。水解富集锌、并与镁分离。富集的锌经硫酸溶解、置换除重金属后，蒸发、冷析制得纯度大于９８％的七水硫酸锌产品。镁回收制成轻质氧化镁，同时副产无水氯化钙。     

硅灰改性氯氧镁水泥机理的研究

测定了掺硅灰氯氧镁水泥的强度和抗水必，采用ＸＲＤ、ＤＴＡ、ＳＥＭ和ＥＤＡＸ等测试手段硅灰增强氯氧镁水泥尤其是后期强度以及改善其抗水性的机理进行了研究。结果发现，适量硅灰的掺入，使得在氯氧镁水泥硬化体中有一部分水化硅酸镁凝胶生成，且５．１．８的结构，形态得以改善，所生成的５．１．８凝胶既有较好的水稳定性又具有较高的密度。此外５．１．８与Ｍｇ（ＯＨ）２的相匹配也趋于合理，以致氯氧镁水泥改性。     

分光光度法快速测定硅酸盐中镁的含量

目前水泥厂硅酸盐试样中镁的测定常采用ＥＤＴＡ滴定法,即在ｐＨ＝１０时用ＥＤＴＡ滴定钙、镁的合量,在ｐＨ＞１２时用ＥＤＴＡ滴定钙离子,然后用差减法求出镁的含量。该方法准确度低,操作麻烦。利用光度法测定镁时由于钙、镁性质相似,硅酸盐试样中大量存在的钙严重...     

镁盐在反应染料废水治理中的应用研究

以含有活性艳红、活性艳黄、活性艳蓝等多种反应染料的高浓度染料废水为试验对象，在反应时间、ｐＨ 值、镁盐加入量、Ｃａ（ＯＨ）２ 的协同影响、与其他絮凝剂比较等几方面系统地研究了镁盐在反应染料废水ＣＯＤ 去除及脱色中的应用。结果表明：对于反应染料废水，镁盐对其ＣＯＤ 去除及脱色效果优于其他试剂。实验最佳条件为ｐＨ＞ １０．５，反应时间０．５ｈ。Ｃａ（ＯＨ）２ 与镁盐吸附处理具有协同作用     

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。