废水中己内酰胺测定的两种方法比较

用高效液相色谱法和紫外分光光度法分别测定某纺织厂排出的废水中己内酰胺的含量.高效液相色谱法以SPD-20A为检测器,检测波长为280 nm,流动相为甲醇:水=35:65,流动相流速为1.0 mL/min.在该检测条件下,己内酰胺的保留时间为6.017 min,相对标准偏差为3.9%,最低检测浓度0.1 mg/L,外标法测得废水中己内酰胺的含量为1.0mg/L;紫外分光光度法以蒸馏水为空白,测得己内酰胺在281 nm处有吸收,此方法检测限为0.5 mg/L,相对标准偏差为4.5%,废水中己内酰胺的含量为1.10 mg/L.     

煅烧温度对ZrO2-TiO2光催化剂结构和性能的影响

采用溶胶-凝胶法合成了不同锆掺杂量的TiO₂催化剂,考察了煅烧温度对催化剂结构和性能的影响.结果表明,在Zr/Ti=0.2,焙烧温度550℃,焙烧时间3 h的条件下,制备的550℃-20%ZrO₂-TiO₂催化活性最好.以头孢曲松钠模拟制药废水,当头孢曲松钠浓度20 mg/L,催化剂浓度为1.0 g/L,300 W氙灯照射180 min后,该催化剂对头孢曲松钠的降解率为61.5%.     

高效液相色谱法测定苯佐卡因含量及其有关物质

采用高效液相色谱法测定苯佐卡因的含量及其有关物质。色谱柱为ODS-BP柱(250mm×4.6mm,5μm),流动相为1.0mol/L冰醋酸溶液-甲醇(60∶40),流速1.0 ml/min,检测波长290nm。苯佐卡因在5～125μg/ml浓度范围内线性良好(r=0.9999)。重复性试验RSD为0.78%,苯佐卡因峰与其他峰之间的分离良好。本方法操作简单,测定快速、准确,专属性好,适用于苯佐卡因的含量及有关物质的测定。     

氢化物发生原子荧光光谱法测定铜矿中的锗

研究了氢化物发生原子荧光光谱法测定铜矿中的Ge，试验了HG-AFS仪器参数，酸度和还原剂加入量，及氢化物发生的条件对Ge荧光强度的影响，以及其共存元素的干扰，并采用硫脲对其干扰进行抑制．在选定的最佳条件下，测定铜矿中的Ge.方法检出限0．65μg／L．相对标准偏差为0．98％．回收率为96．8％～102．5％。     

高效液相色谱法测定喀斯特型高原深水水库中的微囊藻毒素的含量

建立了有效的检测微囊藻毒素LR和RR的方法,对固相萃取--高效液相色谱测定水中痕量藻毒素的部分实验过程进行了优化处理.流动相体积分数:0.080.b TFA的水+甲醇(色谱纯),体积流量:1.0ml/min,紫外检测波长:238nm,进样量:20uL;在该条件下,以HPLC测定MC-LR的检测限为5.0ng/L,MC-...     

富锆锆钛二元合金力学性能和耐蚀性研究

研究了含锆50%以上锆钛二元合金的力学和耐腐蚀性能,并用X射线衍射技术、扫描电子显微技术、力学性能试验、全浸腐蚀失重试验和电化学极化曲线测量技术对其进行表征。结果表明,Zr含量为70%~80%的合金表现出了良好的综合力学性能;合金在5 mol/L HCl溶液中的自腐蚀电流随Zr含量增高而下降,含Zr60%以上的合金表现了很强的耐蚀性。Zr70和Zr80合金实现了良好的综合力学性能和优异耐蚀性的组合。     

反相高效液相色谱法测定牙膏中的甘草次酸

采用反相高效液相色谱法测定了牙膏中的甘草次酸.在YWG-C18(1.0mmi.d.×250 mm,10 μm)色谱柱上,以甲醛0.01 mol/L KH2PO4=8515(VV,pH3.0)的溶液为流动相,流速为1.0 mL/min,紫外检测波长为254nm,室温下检测.甘草次酸用甲醇提取.甘草次酸的平均回收率为99.61%～101.67%,方法的相对标准偏差为1.85%～3.16%.方法操作简便、快速和准确.     

用端视ICP-AES法测定生活水中的多种微量元素

采用端视ICP光谱法测定水中的微量元素。选择了仪器工作条件：功率在950W时测定Ag、Al，在1150W时测定Cu、Cd、Pb、Zn、Fe、Mn、Al、Cr，雾化压力为0．14Pa，进样量在1．2～1．8ml／min。分析线为Cu324．7nm、Cd228．8nm、Pb220．3nm、Fe259．9nm、Zn213．8m、Mn257．6nm、Cr205．5nm、Ag328．0nm、Al396．1nm，测定了各元素的检出限，结果为铜、铅、锌、镉、铁、银、铬、铝、锰的测定下限分别为(μg/l)：2．0、10．0、1．0、2．0、2．5、15．0、3．0、25．0、1．5；测得加标回收试验回收率为94％～101％；样品测定的相对标准偏差为0．67％～3．42％；水中常见元素对各元素测定的干扰可以不计；测定了涪江原水、出厂水、管网水等样品。     

貉被毛中微量元素的ICP-AES分析

采用低温干灰化法制备样品, 用电感耦合等离子体原子发射光谱(ICP-AES）法同时分析毛皮动物貉的被毛组织中多种微量元素. Ba,Be,Cd,Si,Y,Zn的测定下限为1.0～9.0 ng/g级,B,Fe,La,Mg,Mo,Ni,Ti,Co,Cr,Cu,Sr,V,Zr的测定下限为0.01～0.09 μg/g级, In,Th,P,Pb的测定下限为0.13～0.23 μg/g级, Nb为1.08 μg/g级. 经国家人发标准物质(GBW07601)验证, 测得该方法相对误差为083%～959%, 相对标准偏差为081%～520%, 各项检测指标均能满足生物样品检测要求. 分别测得健康种貉、自咬症轻重病貉被毛中的22种微量元素, 健康貉的B,Co,Cr,Ni微量元素含量明显高于病貉,而Al,Ba,Be,Cd,Mo,Pb,Sr,Ti,Zr元素含量较低.     

在表面活性剂存在下,用新显色剂BTAPG分光光度法测定微量钛

本文详细地研究了新显色剂4—（2—苯并噻唑偶氮）焦棓酚（BTAPG）与Ti（IV）和CTMAB的灵敏显色反应和所形成的配合物结构,该配合物最大吸收波长为580nm,表观摩尔吸光系数为7.01×10~4L·mol~(-1)·cm~(-1),钛在0～18μg/25ml范围内服从比耳定律。Ti（Ⅳ）-BTAPG为带负电荷、组成比为1:2的紫红色配合物,其表观稳定常数为1.0×10~9。所拟定的分析方法已满意地用于钢铁中痕量或小量钛的分光光度测定。     

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.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

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.     

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.     

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。     

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.     

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.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that