水体中Cr(Ⅲ)的分光光度分析方法研究

本文采用偶氮胂Ⅲ分光光度法,通过对测量过程中各种条件的优化,建立了一种快速、准确测定水体中Cr(Ⅲ)的分析方法。该方法具有较好的线性,可用于环境水体样品中Cr(Ⅲ)的常规分析。     

TU—1901双光束紫外分光光度法测定矿石中的钍

样品经碱熔后,水提取,制备成2mol/L硝酸溶液,通过N263-聚三氟氯乙烯萃取色层柱,使待测元素与样品中大量的铀、稀钍、锆、钛、铌、等杂质元素进行分离。用4mol/L盐酸洗脱钍,偶氮胂Ⅲ比色,应用TU-1901双光束紫外可见分光光度计测定钍。可测定矿石中0.000x～0.x%的钍。     

荧光猝灭法快速测定环境水中痕量铬(Ⅲ)

在NH4C l-NH3.H2O缓冲溶液介质中铬(Ⅲ)能使荧光试剂水杨醛缩氨基硫脲荧光强度降低,降低的程度随铬(Ⅲ)含量的增加而增大,据此建立了测定痕量铬(Ⅲ)的荧光分析方法.其铬(Ⅲ)的量在20.0~260.0μg/L范围内与△F呈良好的线性关系,方法的检出限为:13.6μg/L,相对标准偏差为2.12%.该方法操作简便、反应迅速、灵敏度高,可直接用于自来水,池塘水及工业废水中铬(Ⅲ)的测定.     

3-羧基偶氮胂的合成及分光光度法测定铬(Ⅲ)

一、引言随着有机试剂的发展,比色测定铬的方法愈来愈多.铬的显色反应大体可分为两类:一类是铬(Ⅵ)氧化有机试剂而显色.此类试剂较少,主要有我们所熟知的二苯基碳酰二肼.另一类是铬(Ⅲ)与有机试剂生成有色络合物.这类试剂较多,特别是近一、二十年来研究得较多,如甲基百里酚兰、甘氨酸甲酚红、偶氮胂M、偶氮胂Ⅲ等.其中,偶氮胂Ⅲ地     

原子荧光法测茶叶中重金属铅残留方法研究

建立了原子荧光光谱法测定茶叶中痕量铅的分析方法.研究氢化物发生体系各试剂对荧光强度的影响,确定最佳的试剂浓度和实验条件.铅在0～10.0ng.mL-1范围内荧光与浓度线性关系良好,线性回归方程为:If=318.13C+22.28.实际样品测定精密度4.7%,回收率为97%～101%;绿茶、普洱茶、球茶铅残留量测定结果分别为:1.41、1.61、1.68mg.kg-1.该分析方法操作简单,灵敏度高,适于样品的批量快速分析.     

新催化光度法测定痕量铁的研究

在硫酸介质中,微量铁(Ⅲ)能显著催化高碘酸钾氧化偶氮胂M(AM)的裉色反应,建立了一个测定痕量铁的新的催化动力学分析方法,研究了该指示反应的最佳反应条件和动力学参数。方法的线性范围为0.0-0.60μg/25mL,检出限为6.1×10-10gm/L。用本法测定了中草药及食品中铁的含量,结果满意。     

高碘酸盐氧化偶氮胂Ⅲ动力学光度测定铑(Ⅲ)

建立了一个以偶氮胂Ⅲ褪色反应为基础的新催化动力学方法． 在ＨＡｃ－ ＮａＡｃ 介质中, 铑催化高碘酸盐氧化偶氮胂Ⅲ褪色, 铑浓度与ｌｏｇ （ Ａ０／ Ａ） 成直线的范围为０ ～０－１６μｇ／ｍ Ｌ （ｒ ＝０－９９８７） ,ｙ＝ ０－２７１０ ｘ－ ０－０６３５ , 检出限为０－１５ｎｇ／ｍＬ, 对０－０８μｇ／ｍＬＲｈ（ Ⅲ） 测定的相对标准偏差为１－５５ ％ （ｎ ＝ １１） ． 铑催化反应对Ｒｈ（ Ⅲ） 和偶氮胂Ⅲ均为一级, 表观活化能为５４－３２ｋＪ／ｍＬ,本法已用于实际样品中痕量铑的测定, 结果满意．     

催化动力学光度法测定痕量金

研究了在硫酸介质中 ,痕量金 (Ⅲ )催化溴酸钾氧化铍试剂Ⅱ褪色的指示反应及其动力学条件 ,据此建立一种新方法 ,该方法的检测极限为 1.2 4× 10 -11g/mL ,线性范围为0～ 0 .4μg/ 2 5mL ,用于样品的测定获得满意的结果     

2-羟基苯乙酮缩-2-羧基苯胺的合成及其应用

目的为了合成新的荧光试剂2-羟基苯乙酮缩-2-羧基苯胺(HAFC)并研究其在测定痕量金属铝离子方面的应用。方法采用荧光分析方法。结果该试剂在429 nm处有强荧光峰,当有铝离子存在时,可形成稳定的络合物而使试剂的荧光猝灭。利用此反应建立了一个荧光测定痕量铝的新方法,其线性范围为0.0~130.0μg.L-1,检出限为0.20μg.L-1。结论此方法成功的应用于生理盐水、葡萄糖注射液、牛奶和油条中铝的测定。     

Cadion 2B改性硅胶预富集水体中的痕量金属

市售硅胶经HNO_3、HCI活化处理后能附载镉试剂2B.文中讨论了镉试剂2B改性的硅胶预富集自来水、湖水中的痕量金属离于,考察了各离子的富集、洗脱条件,从而建立了定量富集痕量锌、镉、汞、银的方法.该方法富集信数可达200倍以上,操作简便.     

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.     

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.     

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.