3,5-diCl-DEPAP与钴显色反应的研究及其应用

本文研究了2-[(3,5-diCl-2-吡啶)偶氮]-5-二乙氨基苯酚(简称3,5-diCl-DEPAP)分光光度法测定微量钴的反应较佳条件。实验结果表明:在pH=3.0～8.2范围内,钴与3,5-diCl-DEPAP形成了1:2的红紫色配合物,该配合物的最大吸收峰λ_(max)=590nm,ε_(590)=9.6×10~4L·mol~(-1)·cm~(-1).在25mL溶液中含有0～12μg钴(Ⅱ)时遵循比耳定律。本法用于V_(B12)、分子筛等的测定,获得良好结果。     

3，5-二溴吡啶偶氮对甲氧基酚与钯（Ⅱ）的显色反应研究

研究了试剂3,5-二溴吡啶偶氮对甲氧基酚(DBPMP)与钯(Pd)的显色反应．发现于pH6．5的醋酸盐缓冲溶液中,形成了配位比为Pd(Ⅱ)：DBPMP=1：2的深红色二元配合物．配合物的最大吸收峰位于508nm,表观摩尔吸光系数为ε=7．48×10^4L／mol·cm．方法用于合成样品的分析,另加标回收率在98．5％～106．2％范围．     

6-Me-BTAMB的合成及其在十二烷基硫酸钠存在下应用于微量铁的光度测定

本文报道了新显色剂2-[2-(6-甲基苯并噻唑)偶氮]-5-二甲氨基苯甲酸(6-Me-BTAMB的合成,研究了在十二烷基硫酸钠存在下铁(Ⅱ)与6-Me-BTAMB形成稳定的蓝紫色配合物,其最大吸收峰位于640nm,表观摩尔吸光系数为1.02×10~5 L·mol~(-1)·cm~(-1),Fe(Ⅱ)在0～3.5μg/25ml范围内服从比尔定律.在NaF和硫脲存在下反应具有较好的选择性.方法已用于直接测定铝合金中微量的铁,结果满意.     

银-2-[3,5-二溴-2-吡啶偶氮]-5-二乙氨基苯酚-十二烷基硫酸钠的显色反应

研究了在阴离子表面活性剂存在的条件下,银与2-[3,5-二溴-2-吡啶偶氮]-5-二乙氨基苯酚的反应条件。阴离子表面活性剂十二烷基硫酸钠能使Ag-2-[3,5-二溴2-吡啶偶氮]-5-二乙氨基苯酚配合物增敏,其最大吸收峰位于565nm处,摩尔吸光系数为6.4×10~4L·mol~(-1)·cm~(-1),在0～0.48μg/ml时符合比尔定律。试剂与Ag~+形成2:1的配合物。此方法用于纯铅及铅锑合金中银的测定,可获得满意的结果。     

青霉素分光光度法测定微量铁的研究

本文研究了青霉素和盐酸羟胺的反应产物与铁的显色反应.在pH8.0的NH_3·H_2O-NH_4C l缓冲介质中,铁与青霉素和羟胺的反应产物生成亮黄色配合物,其配合物的最大吸收波长位于435nm处,摩尔吸光系数为3.2×10~3L·mol~(-1)·cm~(-1),Fe(Ⅲ)浓度在0-5.5μg/ml范围内符合比尔定律.该法用于碳酸钙中微量铁的测定,结果满意.     

新试剂APNBT与汞的显色反应研究(英文)

研究新试APNBT课题与汞显色反应的最佳条件,在TrtonX—100存在下,pHl0.4～12.0范围内汞(Ⅱ)与试剂形成黄色配合物,组成为1:2,最大吸收波长为450nm,ε’为8.88×10~4L·mol~(-1)·cm~(-1),在535nm处,试剂的吸收与配合物的吸收差值最大,ε’为1.18×10~5L·mol~(-1)·cm~(-1),线性范围0～20μgHg(Ⅱ)/25mL,以双硫腙萃取汞(Ⅱ),分离干扰元素,成功地测定了合成试样和天然水中的汞,加入回收率为96％～102％。     

HBED与铝(Ⅲ)结合的光谱特性

在 p H 7.4、0 .1mol· L- 1 N- 2 -羟乙基哌嗪 - N' - 2 -乙磺酸 ( Hepes)及室温条件下 ,使用紫外吸收差光谱和荧光光谱进行了铝 ( )对 N,N′-二 ( 2 -羟苄基 )乙二胺 - N ,N′-二乙酸 ( HBED)的滴定 .结果表明铝 ( )与 HBED形成1∶ 1的配合物 .铝 ( )与 HBED结合后其紫外差光谱在 2 3 5 nm和 2 88nm处出现吸收峰 ;配合物在 2 3 5 nm的摩尔吸光系数是 1.0 9× 10 4cm- 1 · mol- 1 · L ;条件稳定常数是 lg K=13 .70± 0 .74;铝 ( )的结合使 HBED在 3 18nm处的最大荧光峰增强约 6.4倍 .根据游离配体分子内氢键形式讨论了荧光增强的原因     

固相萃取光度法测定环境水样中镉(Ⅱ)的研究

 研究了用3,5-二溴-2-吡啶偶氮重氮氨基偶氮苯(3,5-DB-PDAB)固相萃取光度法测定镉(Ⅱ).在pH=10的硼砂-氢氧化钠缓冲介质中,TritonX-100存在下,3,5-DB-PDAB与镉(Ⅱ)反应生成2:1稳定配合物,体系最大吸收波长为530 nm,摩尔吸光系数ε=1.62×10⁵L/(mol·cm),环境水样中的镉(Ⅱ)用强阴离子交换固相萃取柱固相萃取预分离和富集后用该方法测定,方法简单,准确度高,回收率96%～10%,相对标准偏差小于3.5%.     

分光光度法测定Fe(Ⅲ)-二甲酚橙显色反应的研究

在 5× 10 -2 mol·L-1HCl溶液中 ,二甲酚橙与Fe(Ⅲ )生成紫红色络合物 ,其最大吸收波长位于5 6 0nm处 ,表观摩尔吸光系数ε =2 .0× 10 4L·mol-1·cm-1.Fe(Ⅲ )含量在 0～ 2 .4mg·L-1范围内符合Beer定律 .用于水样中微量铁 (Ⅲ )的测定 ,结果较满意     

Cu(Ⅱ)与乙二醛双缩(1,8-氨基萘酚-3,6-二磺酸)显色反应的研究

本文研究了Cu(Ⅱ)与乙二醛双缩(1,8-氨基荼酚-3,6-二磺酸)的显色反应。测定Cu(Ⅱ)与该试剂形成1:1和1:2两种配合物;最大吸收峰在600nm,摩尔吸光系数为9.85×10~3l·mol~(-1)·cm~(-1),logβ_1=5.32,logβ_2=15.54,并用该法测定了铜镍矿和鄂铜矿中的微量铜。     

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