COF-TpPa枝接阵列微孔不锈钢纤维的制备及其作为SPME吸附剂的应用

以化学键合COF-TpPa的蚀刻不锈钢纤维作为固相微萃取(SPME)的吸附剂,建立了SPME-气相色谱-火焰离子化检测器测定水中痕量多环芳烃(PAHs)的方法。该方法的线性相关系数为0.9755～0.9979,检出限(S/N=3)为0.2～0.5μg·L^-1,单根萃取纤维6日内相对标准偏差和3根平行萃取纤维丝间相对标准偏差分别为1.9%～7.3%和3.6%～8.6%。将建立的方法用于实际水样中PAHs的测定,回收率为96.8%～165.4%。     

气相色谱质谱法测定土壤中邻苯二甲酸酯残留量

建立了固相萃取-气相色谱质谱法同时测定土壤中9种邻苯二甲酸酯残留量的检测方法。在10.0～300μg·L^-1浓度范围内9种邻苯二甲酸酯化合物线性良好，方法检出限为0.7～2.0μg·kg^-1，土壤样品加标回收率为87.0%～105.0%，相对标准偏差为2.5%～4.5%。本方法操作简便，检出限低，测试结果重现性和准确度好，适用于土壤中邻苯二甲酸酯化合物的检测。     

气相色谱质谱法同时测定地表水中6种磷系阻燃剂残留量

利用固相萃取技术对水样中磷系阻燃剂进行富集,建立了气相色谱质谱法同时测定地表水中磷酸三乙酯、磷酸三丙酯、磷酸三丁酯、磷酸三(2-氯异丙基)酯、磷酸三苯酯和磷酸三辛酯残留的方法。6种磷系阻燃剂在10.00～500μg·L^-1浓度范围内对应的线性相关系数均大于0.995,检出限为0.07～0.11μg·L^-1,纯水样品中加标回收率为87.0%～104.5%,相对标准偏差为1.76%～4.35%。方法前处理操作简单,灵敏度高,测试结果准确可靠。     

气相色谱法同时检测土壤中6种有机磷农药的残留

本文建立了固相萃取-气相色谱法同时检测土壤中甲胺磷、乐果、对硫磷、甲基对硫磷、丙溴磷和三唑磷残留的方法。6种有机磷农药的线性范围为10.0～300μg·L^-1,线性相关系数均大于0.995,检出限在0.003～0.009μg·kg^-1之间,样品加标回收率在89.8%～106.7%之间,6次测试结果的相对标准偏差小于5%。该方法前处理操作简单,灵敏度高,具有良好的回收率和稳定性,适用于土壤中有机磷农药残留的测定。     

HPLC法测定福司氟康唑含量及有关物质

采用ODS色谱柱(250mm×4.6mm,5μm),以0.01mol·L^-1的Na H2PO4(pH值为5.5)-乙腈为流动相,梯度洗脱,流速为1.0m L·min-^-1,柱温40℃,检测波长210nm。福司氟康唑与其中间体二苄酯及起始物料氟康唑均能得到较好的分离。福司氟康唑的定量限为53.93ng·m L^-1,检测限为16.18ng·m L^-1;浓度在0.05～1556.28μg·m L^-1,与峰面积线性良好,r=0.9999;平均回收率为99.28%。氟康唑的定量限为14.49ng·m L^-1,检测限为4.35ng·m L^-1;浓度在0.02～20.70μg·m L^-1与峰面积线性良好,r=0.9998;平均回收率为97.03%。二苄酯的定量限为43.47ng·m L^-1,检测限为13.04ng·m L^-1;浓度在0.04～21.74μg·m L^-1     

固相萃取-气相色谱法测定地表水中3种有机磷农药

建立了66889-U型膜固相萃取富集气相色谱法(GC)测定地表水中甲拌磷、百治磷和敌杀磷3种有机磷农药含量的方法。对萃取介质的选择、反应pH值、进样流速及进样体积等实验条件进行了优化。结果显示,66889-U型固相萃取膜为富集介质,环境溶液pH值为7、进样流速100m L·min^-1及进样体积400m L时,样品加标回收率达到最高值。在最优实验条件下,甲拌磷、百治磷和敌杀磷标线方程分别为y=4.115×10⁴x-1.223×10²、y=2.496×10⁴x-3.442×10²和y=3.781×10⁴x+1.057×10²,线性相关系数良好(r>0.999),检出限和测定下限分别为0.01μg·L^-1和0.03μg·L^-1,相对标准偏差RSD为1.43%～5.64%,加标回收率为95%～105.6%。运用该方法检测湖水、河涌水及池塘水样品中甲拌磷、百治磷和敌杀磷,实际样品中均检出上述3种...     

基于液微萃取-GFAAS的煤矿水样中重金属含量的测定

针对传统分析化学对重金属离子进行分析时,样品前处理复杂,有机溶剂用量大,耗时长的问题,提出基于轻质萃取剂的分散液液微萃取（LDS-DLLME）的建立。首先,对萃取条件进行优化,然后将优化后的微萃取方法与其他测定方法测定煤矿水样中 Pb（Ⅱ）与 Cd（Ⅱ）进行比较。结果表明,当辛醇体积为 75μL,甲醇体积为 300μL,样品 pH 值为 8.0,螯合剂浓度为 0.2g·L^-1的条件下,得到 Pb（Ⅱ）的检出限为 0.15μg·L^-1,Cd（Ⅱ）的检出限为 0.03μg·L^-1。同时与其他方法进行比较,得到煤矿水样的相对回收率在 70%～106%之间,表现出良好的重现性,说明该方法可用于煤矿水样的检测。     

高效液相色谱质谱法测定水中7种苯甲酰脲类杀虫剂残留

建立了固相萃取技术富集、高效液相色谱质谱法同时测定水中氟幼脲、双苯氟脲等7种苯甲酰脲类杀虫剂残留的分析方法。水样经活化后的HLB固相萃取小柱提取浓缩,用10m L正己烷-丙酮(体积比为1∶1)洗脱柱,洗脱液氮吹至近干后加丙酮定容至1m L,用高效液相色谱质谱法分析。氟幼脲、双苯氟脲等7种苯甲酰脲类杀虫剂在5.00～400μg·L^-1浓度范围内线性良好,方法检出限在0.03～0.08μg·L^-1之间,样品加标回收率为88.0%～103.4%,相对标准偏差为1.3%～4.2%。实验结果表明,该方法操作简单、灵敏度高、测试准确,可用于水中多种苯甲酰脲类杀虫剂残留的检测。     

气相色谱质谱法测定地表水中4种有机磷农药

建立分散液液微萃取结合气相色谱质谱法测定地表水中灭线磷、甲基对硫磷、马拉硫磷和对硫磷残留的方法。结果显示,灭线磷、甲基对硫磷、马拉硫磷和对硫磷在5.00～200μg·L^-1质量浓度范围内与色谱峰面积线性关系良好,检出限分别为0.15、0.20、0.35、0.10μg·L^-1,样品加标回收率在91.2%～104.0%之间。本方法操作简便,测试结果重复性和准确度较好,适用于地表水中灭线磷、甲基对硫磷、马拉硫磷等有机磷农药残留的检测。     

离子色谱法测定聚酰亚胺原料中的氯离子

通过萃取的方法对样品进行前处理,离子色谱法对聚酰亚胺原材料6FAP中的氯离子进行定量分析。方法检出限4.5μg·L^-1,相对标准偏差(RSD)小于1%,样品氯离子加标回收率为95%～105%。结果表明,本方法具有可行性,可为聚酰亚胺的原料中的氯离子分析提供一定参考。     

乙苯,苯乙烯的生产及合成乙苯,苯乙烯催化剂的研究进展

苯乙烯是重要的石油化工原料。本文介绍了国内外苯乙烯生产的发展概况，合成乙苯，苯乙烯所用的催化剂种类，并就苯乙烯生产及催化剂的发展趋势提出了自己的观点。     

Synthesis and characterization of homopolymers and copolymers of various acrylates and acrylonitrile

Various homopolymers and copolymers of methyl acrylate, ethyl acrylate, butyl acrylate, and acrylonitrile in different feed ratios were synthesized. These were characterized by IR, ¹³C-NMR, DSC, DTA, and TGA. Spectroscopic characterization helped in differentiating copolymers of different mol ratios. Thermal analysis revealed different degradation patterns for homopolymers and copolymers. The temperature and energy changes associated with various phase transitions were dependent on the chemical composition of homo- and copolymers, as expected. © 1993 John Wiley & Sons, Inc.     

生物质气化及生物质与煤共气化技术的研发与应用

总结了生物质原料的特点及生物质单独气化的缺点;介绍了国内外生物质气化技术及生物质与煤共气化技术的研发与应用现状;分析了在此领域国内外的发展趋势与前景;概括了开展生物质与煤共气化技术研发的意义。     

Electronic structures and reactivities of monometallic and bimetallic clusters of Au and Cu

The variation of the Au 4f binding energy of Au clusters with the cluster size has been established by measuring the binding energies of clusters whose size distributions were independently determined by HREM and STM. The binding energy increases significantly when the cluster size is less than 2 nm. Au-Cu bimetallic clusters of the composition Cu₃Au have been deposited for the first time on carbon substrates. The shifts in the core level binding energies of the bimetallic clusters show the effect of alloying in the case of large clusters, but show effects of both alloying and cluster size in the case of the small clusters. The interaction of CO with Cu₃Au clusters is stronger than with a bulk Cu metal. The interaction of CO with small Cu clusters also seems to be stronger than with bulk Cu or with large Cu clusters.     

钾盐资源及钾肥供需情况分析及预测

阐述了国内外钾盐资源及钾肥生产现状,对国内外钾盐的供需形势进行了分析及预测,从资源、原材料、国际市场三方面提出了解决我国钾盐短缺的措施。     

Kinetics and Mechanism of Oxidation of Mono- and Polyacetals

Abstract

Kinetics and mechanisms of oxidation of 6 acetals by molecular oxygen and ozone in liquid phase have been studied. Reaction with molecular oxygen (70°C, 15–16 hr) leads to the formation monoethers of the corresponding glycols with 68–90% selectivity. Salts of metals and complexes with crown-ethers have increased the reaction rate significally. Ozone have reacted with acetals with formation similar products. The mechanisms of intermediate stages have been proposed.     

Comparison of the Adhesion and Cohesion of Triblock and Random Copolymers of Styrene and Butadiene

A substantially greater detachment energy is required to strip a polyethylene tereph-thalate (Mylar) film from a styrene-butadiene-styrene (SBS) triblock copolymer compared to that for peeling from a random styrene-butadiene (SBR) copolymer. This is true even though the intrinsic interaction between the Mylar and each elastomer is expected to be similar because of their virtually identical chemical composition. It is proposed that this difference in peel strength (between the SBS and SBR) is a consequence of the much higher dissipative capacity of the former elastomer. Another manifestation of this is the higher cohesive tear strength of the SBS compared to the SBR. Extents of energy dissipation within each elastomer during detachment of the Mylar adherend are consistent with the hypothesis that the average maximum stress experience before detachment is some similar fraction of each elastomer's tensile strength.     

Wetting properties of homopolymers and copolymers of pentafluorostyrene and methylacrylate and homopolymer blends

Polypentafluorostyrene (PPFS), polymethylacrylate (PMA), and poly(pentafluorostyrene-co-methylacrylate), poly(PFS-co-MA) were prepared and the wetting characteristics of polymer blends of PPFS and PMA were compared with that of poly(PFS-co-MA) via contact angle measurements. The critical surface tension of polypentafluorostyrene was found to be 22.6 dyne/cm, which is comparable to the value reported for polytrifluoroethylene (22 dyne/cm). The critical surface tension of poly(PFS-co-MA) is not linearly related to its composition. The polymer blends of PPFS and PMA exhibit significant surface enrichment of the fluoropolymer. The harmonic-mean method¹ was employed to determine surface tensions of these polymers and many known polymers. It is found that the method produces useful surface tension data provided the contact angle values are derived from testing liquids of dissimilar polarity.     

实施水泵节能技改 实现节能降耗

介绍了内蒙古亿利化学工业有限公司在满足生产的前提下,对现有的循环水泵实施的节能技改及效果。     

责任和责任心的涵义与结构

责任是人应主动承担的角色义务和对其因过失所造成后果应承担的责罚.有两层涵义:一是义务;二是后果.责任心是个体自觉做好分内事务和履行道德义务的心理倾向,是个性心理品质成分中自我特征维度上的重要内容.责任心具有两个方面的涵义:一是角色分内职责;二是角色道德义务.责任心是一种通过责任认知、责任个性和责任适应的动态形式表现出来的静态品质,责任心是责任心过程结构与责任心关系结构相互制约、相互影响的统一体.