高效液相色谱法测定土壤中甲醛的含量

建立衍生化—高效液相色谱法（HPLC）测定土壤中甲醛含量的方法。方法：样品中甲醛经超声波水浴提取,与2,4-二硝基苯肼衍生反应后,用高效液相色谱法进行分离,在360 nm紫外波长下检测,外标法定量。该方法在1.0-100.0mg/L浓度范围内线性良好（r=0.999 8）,样品中甲醛最小检测浓度为0.2 mg/kg,添加回收率在90%-102%之间,日内与日间的相对标准偏差分别为4.70%和5.08%。结论：衍生化—高效液相色谱法适用于对土壤中甲醛含量的快速分离,并进行定性定量检测。     

高效液相色谱柱前衍生法测定水产品中的 游离甘氨酸

建立一种高效液相色谱柱前衍生法测定水产品中的游离甘氨酸。采用C18色谱柱，以乙 腈+0.01 mol/L乙酸钠溶液（pH = 4.2）（1.2.7）= 3+7作为流动相，检测波长为254 nm，利用高效液相色 谱法-二极管阵列器进行外标法定量测定。实验结果表明，甘氨酸方法检出限为50 mg/kg，在浓度为 1 ~ 50 µg/mL范围内成线性关系，回收率为90.4%~101%，相关标准偏差（RSD）为2.5% ~ 3.3%。该方 法方便，灵敏度高，定性定量准确，分析时间短，可很好地实现水产品类样品中游离甘氨酸的测定。 同时此方法样品检测结果与氨基酸分析仪样品结果偏差均在10%范围内，也可作为氨基酸分析仪法 外的补充方法。     

食品及饲料中三聚氰胺残留量液相色谱检测方法的研究

建立了食品及饲料中三聚氰胺残留检测的反相高效液相色谱方法。样品经乙腈水或甲醇水提取,离心分离,过0.2m滤膜,然后采用RP-HPLC-UV法测定,外标法定量。对色谱分离条件进行了优化,三聚氰胺在0.05g/mL～10.0g/mL范围内线性良好,相关系数为0.99994。在4.0mg/kg～80.0mg/kg浓度范围内,平均加标回收率在90.5%～102.7%之间,相对标准偏差为2.96%～3.62%,方法的最低检出限为5mg/kg。该方法简便、快速,满足食品及饲料中三聚氰胺残留量的检验工作需要。     

加压毛细管电色谱法测定鳗鱼中5种磺胺类药物残留

建立了加压毛细管电色谱（pCEC）法同时测定鳗鱼中磺胺嘧啶、磺胺间甲氧嘧啶、磺胺喹噁啉、磺胺甲噁唑、磺胺二甲异噁唑5种磺胺类药物残留的分析方法。样品均质后经乙酸乙酯提取,无水硫酸钠脱水,HLB固相萃取柱净化,最后利用加压毛细管电色谱进行检测。通过优化有机相的比例,流动相中的盐浓度和电压等色谱条件,使5种药物的出峰时间控制在6.5 min内。结果表明：5种磺胺类药物在0.5～5μg/mL浓度范围内线性关系良好（R〉0.999 0）,磺胺嘧啶、磺胺间甲氧嘧啶检出限为0.02 mg/kg;磺胺喹噁啉的检出限为0.03 mg/kg;磺胺甲噁唑、磺胺二甲异噁唑的检出限为0.04 mg/kg。在鳗鱼空白样本中加标浓度分别为2 mg/kg、5 mg/kg,5种药物相应的回收率在71%～82%之间,该法快速、准确,能够满足日常检测需要。     

对氨基苯酚印迹聚合物磁微粒制备及其萃取应用

在SiO₂和3-（甲基丙烯酰氧）丙基三甲氧基硅烷（MPS）双重修饰的纳米Fe₃O₄表面合成对氨基苯酚分子印迹聚合物.并将该材料应用于染发剂中氨基苯酚类化合物的磁固相萃取.优化上样时间与体积、洗脱剂组成与体积、溶液酸度与盐度等萃取条件,建立染发剂中氨基苯酚类化合物的磁固相萃取-高效液相色谱（MSPE-HPLC）分析方法.结果表明,染发剂中对氨基苯酚和间氨基苯酚分别在0.06～50 mg/kg和0.08～50 mg/kg浓度范围内线性关系良好（R²分别为0.998 9和0.998 3）,检出限（S/N=3）分别为0.018和0.024 mg/kg,日内日间精密度良好（RSD小于7.7%）.该方法灵敏度高、重现性好,适用于染发剂中氨基苯酚类的定量分离分析.     

HPLC法测定酒中顺、反式白藜芦醇含量的研究

提出了酒样经超滤脱气直接进样,用高效液相色谱（HPLC）法测定酒中顺、反式白藜芦醇异构体含量的新方法。色谱条件为：固定相BDS Hypersil C18柱,流动相为水-乙腈（70∶30）,流动相流速为1.0 mL/min,检测器检测波长分别为306nm、288nm.顺、反式白藜芦醇的色谱峰面积分别与2.0mg/L-47.8 mg/L和2.6mg/L-52.0 mg/L浓度范围内有良好的线性关系。本方法成功地应用于白酒及保健酒中白藜芦醇的测定。     

培养液组胺的检测及鲣鱼产组胺菌的生物活性评价

通过直接将培养液中的组胺经丹酰氯衍生化生成稳定的物质,以1,7-二氨基庚烷为内标,建立高效液相色谱-紫外检测器(HPLC-VWD)方法检测培养液中的组胺;并研究了温度和pH对产组胺菌生长和组胺产生的影响。结果表明,培养液中组胺的检测方法定量限为0.5μg/mL,回收率在100%～107%,满足方法培养液中组胺的检测。经分离得到的2株产组胺菌分别记为J2和J4,2株菌在添加L-组氨酸的胰酶大豆肉汤里均能够产生组胺;菌株J2和J4最适生长温度均为30℃,最适pH分别为7和6,菌株J2和J4产组胺的最适温度分别为25℃和30℃,最适pH均为5,在适宜的实验条件下组胺产生量最大值为12.47 mg/L。     

固相萃取-高效液相色谱法同时检测化妆品中14种邻苯二甲酸酯

建立了化妆品中14种邻苯二甲酸酯类环境激素的高效液相色谱-二极管阵列检测器(HPLC-DAD)检测方法。样品通过甲醇超声提取,硅胶柱净化,氮吹浓缩后,以乙腈/水为流动相,经Warters-C18(250mm×4.6mm,5μm)液相色谱柱分离,进行HPLC-DAD分析。方法线性相关系数R0.998,检出限为0.25mg/kg~2.0mg/kg,在10mg/kg添加水平时样品加标回收率为79.9%~100.2%,RSD为0.93%~4.34%。该方法灵敏、快速、高通量,检测了国际关注的14种邻苯二甲酸酯激素,为相关国家标准的制定提供重要参考依据。     

高效液相色谱-串联质谱法测定茶叶中的敌百虫

建立了茶叶中敌百虫农药残留的高效液相色谱-串联质谱检测方法.茶叶样品用乙腈溶液超声提取,采用QuEChERS法净化后,经C18色谱柱分离,正离子多反应监测模式测定,外标法定量.结果表明,基质标准溶液中的敌百虫在一定浓度范围内呈良好线性,R2均大于0. 999,检出限为0. 03 mg/kg,以绿茶、乌龙茶、红茶3种茶叶的茶样分别进行0. 05、0. 5和5 mg/kg三个浓度的加标回收实验,平均回收率在80. 3%～118. 0%之间,RSD2. 61%.该方法快速、准确、灵敏度高,可用于茶叶中敌百虫残留量的检测,并为敌百虫在不同茶类中的基质效应研究取得了初步的进展.     

基于QuEChERS高效液相紫外检测器测定苹果和梨中的灭多威

建立了一种基于改进的QuEChERS前处理方法结合高效液相色谱测定苹果和梨中灭多威的方法.样品经QuEChERS方法处理浓缩后,采用ZORBAX-SB C_(18)色谱柱分离,以V(CH_3OH)∶V(H_2O)=50∶50为流动相,紫外检测波长235 nm,标准曲线R=0.999 96,最低检出限为1.94×10~(-3)mg/kg.平均回收率分别为90.1%和93.4%.     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

橡胶颗粒沥青混合料低温抗裂性试验研究

以AC-13级配为基础,将橡胶颗粒代替部分集料掺入混合料中,以低温弯曲试验为评价方法对不同橡胶颗粒掺量下沥青混合料的低温抗裂性进行研究,并引入应变能密度值对混合料的低温抗裂性进行综合评价.试验结果表明:橡胶颗粒沥青混合料试件的破坏微应变均超过2 300,满足冬寒区的技术指标;无论是否掺加橡胶颗粒,随着温度的下降,沥青混合料破坏时的最大弯拉强度增大,弯拉应变降低,劲度模量增大;弯曲应变能密度在胶粒掺量为1%左右时具有较大的弯曲应变能密度值,此时橡胶颗粒沥青混合料具有较好的低温抗裂性.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

Quantitative trait loci （QTLs） for quality traits related to protein and starch in wheat

Quality traits in wheat （Triticum aestirum L.） were studied by quantitative trait locus （QTL） analysis in a recombinant inbred line （RIL） population, a set of 131 lines derived from Chuan 35050 × Shannong 483 cross （ChSh）. Grains from RILs were assayed for 21 quality traits related to protein and starch. A total of 35 putative QTLs for 19 traits with a single QTL explaining 7.99-40.52% of phenotypic variations were detected on 10 chromosomes, 1D, 2A, 2D, 3B, 3D, 5A, 6A, 6B, 6D, and 7B. The additive effects of 30 QTLs were positive, contributed by Chuan 35050, the remaining 5 QTLs were negative with the additive effect contributed by Shannong 483. For protein traits, 15 QTLs were obtained and most of them were located on chromosomes 1 D, 3B and 6D, while 20 QTLs for starch traits were detected and most of them were located on chromosomes 3D, 6B and 7B. Only 7 QTLs for protein and starch traits were co-located in three regions on chromosomes 1D, 2A and 2D. These protein and starch trait QTLs showed a distinct distribution pattern in certain regions and chromosomes. Twenty-two QTLs were clustered in 6 regions of 5 chromosomes. Two QTL clusters for protein traits were located on chromosomes 1D and 3B, respectively, three clusters for starch traits on chromosomes 3D, 6B and 7B, and one cluster including protein and starch traits on chromosome 1D.     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.