气相色谱法测定橡胶木材中五氯苯酚残留量

建立了气相色谱-电子捕获检测器法(GC-ECD)定量检测橡胶木材及制品中五氯苯酚(PCP)残留的方法。样品经甲醇提取、衍生化后GC-ECD进行定量分析,PCP浓度在20~400μg/L范围内线性关系良好(r=0.9968),检出限(LOD,S/N=3)为0.03 mg/kg,回收率范围为86.2%~108.1%,相对标准偏差小于2.6%。该方法简单、准确度高、分析时间短,可用于快速检测橡胶木材及制品中的五氯苯酚残留。     

液液萃取气相色谱法测定生活饮用水中五氯苯酚

本方建立了液液萃取气相色谱法测定生活饮用水中五氯苯酚的方法。用HCl调节水样至pH值为5左右,用正已烷一次萃取水样中五氯苯酚,萃取经无水硫酸钠脱水浓缩后,用的气相色谱仪进行检测。五氯苯酚标准曲线线性关系良好,检出限为0.02μg·L~(-1),93.3%~96.8%之间,相对标准偏差小于2%。本方法操作简便,萃取效率高,检出限低,测定结果令人满意,适用于生活饮用水中五微量氯苯酚的检测。     

气相色谱法测定水产品中五氯苯酚及其钠盐残留量

对研究南美白对虾、鳕鱼、草鱼肌肉中五氯苯酚及其钠盐残留量气相色谱检测方法,样品中的五氯酚钠,在酸性的条件下转化为五氯苯酚,用正己烷萃取,再用碳酸钾溶液反萃取,萃取物以乙酸酐衍生,生成衍生物五氯苯酚乙酸酯,再用正己烷萃取,用气相色谱(配备电子捕获检测器)测定,外标法定量。在0.5～100μg/L范围内线性关系良好,相关系数r=0.99996。本方法最低检测限为0.7μg/kg。加标水平为2.0、5.0、10.0μg/kg时加标回收率为82.5%～92.3%之间。     

气相色谱法测定木家具中五氯苯酚的含量

文章研究了气相色谱—电子捕获检测器定量测定木家具中五氯苯酚含量的方法。样品经甲醇超声波提取,乙酸酐衍生化,衍生物再用正己烷萃取,有机相针式过滤头过滤后采用气相色谱—电子捕获检测器进行检测。结果表明,在0.04~1μg/m L的范围内线性关系良好,相关系数为0.9996,平均回收率为92.7%~103.6%,相对标准偏差≤4.85%,方法检出限为0.05 mg/kg。方法操作简便,回收率好,适合于木家具中五氯苯酚含量的检测。     

超声波辅助分散液液微萃取测定水样中的多氯联苯

将超声波辅助分散液液微萃取（USADLLME）与气相色谱-大新技术公司电子捕获检测器（GC-ECD）联合,建立了一种高灵敏度检测水样中多氯联苯的新方法。对影响微萃取的因素进行了优化。在优化的条件下,该方法的线性范围为0.05～50μg/L（r^2〉0.999 5）,相对标准偏差在1.4%～6.9%之间。相对检出限为7.24～16.3 ng/L（S/N=3）。在自来水、塘水、江水中分别加入0.1、0.5、1μg/L多氯联苯溶液,加标回收率为81.1%～100.6%、88.1%～95.6%和85.0%～101.8%。本方法可以对水环境中的痕量多氯联苯进行检测,具有操作简便、快速等优点。     

气相色谱串联质谱法测定水中多种有机氯农残

建立了农田用水中16种有机氯农药(包括五氯苯甲醚、五氯硝基苯、五氯苯胺、七氯、艾氏剂、氧氯丹、环氧七氯、反-氯丹、硫丹1、顺-氯丹、狄试剂、异狄试剂、硫丹2、异狄试剂醛、硫丹硫酸盐、异狄试剂酮)残留量的气相色谱-串联质谱的检测方法。该方法中水样经有机溶液振荡提取,旋转蒸发浓缩,用气相色谱串联质谱法检测,外标法定量。本方法检出限为0. 05μg/L;有机氯农药添加水平为1. 0μg/L时,样品中的回收率在80%～105%之间。     

液液萃取-气相色谱质谱法测定水样中20种多氯联苯

建立了液液萃取-气相色谱质谱法测定水样中20种多氯联苯的分析方法,以二氯甲烷为萃取剂,对水样进行液液萃取。收集萃取液进行浓缩、净化、再浓缩,气相色谱质谱法测试。目标物经HP-5MS UI色谱柱分离,选择离子模式扫描,内标法定量。结果表明,在5.0～500.0μg/L浓度范围内呈现良好的线性关系,线性相关系数在0.996～0.999范围内,方法检出限为0.2～1.4μg/L。对地下水、地表水、生活污水实际样品进行加标验证。该方法检出限低、灵敏度高、准确度高、重现性好,可满足批量水样中20种多氯联苯的检测要求。     

气相色谱-质谱联用检测环境水体中的三嗪类除草剂

研究了用气相色谱-质谱联用技术检测环境水中三嗪类除草剂的分析方法,被测物质包括阿特拉津、西玛津、氰草津及阿特拉津的两种代谢产物去乙基阿特拉津和去异丙基阿特拉津。外标法定量,液–液萃取分析500mL水样,加标浓度分别为0.2,0.5,1.0μg/L时,回收率在51.75%～125.05%之间,两种代谢物的回收率相对较低。理论方法检出限为0.01～0.06μg/L,线性范围为0.01μg/mL～1.0μg/mL。用该方法可实现对环境水体中痕量三嗪类除草剂的检测。     

SPE-GC/MS法检测水体中五氯酚残留

采用固相萃取-气相色谱/质谱法(SPE-GC/MS)研究了温州市水体中的五氯酚(PCP)残留。水样经乙酸酐衍生后用C18固相萃取柱进行富集,10 mL二氯甲烷洗脱,并采用GC/MS法对PCP衍生物五氯苯乙酸酯进行定性定量分析。本实验建立的方法定性定量准确、可靠,适用于水体中PCP的监测,在所有测定的水样中,除温州市区自来水和A、C水库水样以外,其它均有少量PCP检出,最高残留检出量为0.074μg/L。     

液液萃取高效液相色谱法分析水源水中酚类和苦味酸

建立了液液萃取-高效液相色谱法同时测定水源水中的苦味酸和6种酚类化合物(苯酚、间甲酚、对硝基酚、2,4-二氯酚、2,4,6-三氯酚和五氯酚)。水样首先经乙酸乙酯和二氯甲烷混合溶剂液液萃取,有机相氮吹浓缩后再进行液相色谱分析。结果表明,苦味酸和6种酚类化合物色谱峰完全分离,目标物在0.1～10 mg/L范围内线性关系良好,相关系数R2为0.999 1～0.999 9。方法检出限为0.013～0.025μg/L,RSD为2.8%～4.5%,加标回收率为71.4%～90.4%。     

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.