重铬酸钾分光光度法测定药片中维生素C

在0.16 mol/L 硫酸介质中,维生素C与重铬酸钾发生褪色反应.采用分光光度法在350 nm处测定重铬酸钾的吸光度变化值ΔA.ΔA与维生素C的浓度在1.7～100 μg/mL范围内成线性关系,回归方程为ΔA =0.007 7CX 0.027,相关系数R=0.998 5.用于药片中维生素C含量的测定,回收率在91%～99%之间.该方法操作简便,准确性好,灵敏度高.     

黄浦江和长江原水臭氧化工艺中BrO-3的生成

针对黄浦江和长江原水,通过臭氧化小试实验研究副产物溴酸根(BrO-3)的生成.结果表明,黄浦江原水中含溴离子(Br-)较少,生成的BrO-3超标风险较低;而长江原水中Br-含量较高,为103.5 μg/L;1.6 mg/L初始溶解O3、pH 7.3、B-r 100 μg/L、25 ℃条件下,长江原水臭氧化30 min后生成了15.2 μg/L BrO-3,超过国家标准10 μg/L(GB 5749-2006)的限值规定.调低pH值、减少初始O3浓度、降低温度均有利于控制BrO-3的生成.长江原水臭氧化过程中ct值和BrO-3生成量之间线性关系较好.实验中OUT指标与BrO-3生成量的线性关系不明显,不可代替ct作为衡量BrO-3的标准.     

5-羧基-1,3,4-三氮唑偶氮氯膦-过氧化氢催化动力学光度法测定痕量铜(Ⅱ)

研究了铜(Ⅱ)催化H2O2氧化5-羧基-1,3,4-三氮唑偶氮氯膦（CTACPA）的褪色反应,褪色反应程度与铜(Ⅱ)量在一定范围内呈线性关系,建立了测定痕量铜(Ⅱ)的催化动力学光度法。在pH 4.0的HAc-NaAc缓冲溶液中,褪色体系的最大吸收波长535 nm,铜(Ⅱ)的质量浓度在0.004～0.2 μg/mL范围内符合线性关系,回归方程为ΔA=3.0260ρ-7.24?0-3（ρ: μg/mL）,相关系数r=0.9994,检出限为2.90?0-10 g/mL。方法不经分离直接测定头发和河水中的痕量铜,测定结果与AAS法的测定值相符。     

灿烂甲酚蓝褪色光度法测定饮用水中的溴酸根

基于稀盐酸介质中,溴酸根氧化灿烂甲酚蓝的褪色反应,建立了测定痕量溴酸根的新的褪色光度分析方法,对反应的条件进行了优化,在测定波长630 nm及选择的实验条件下,溴酸根的含量在0.0~3.0μg·m L-1,灿烂甲酚蓝的褪色速率(ΔA)与CBr O3-呈正比例关系,校准曲线方程为ΔA=0.2053CBr O3-+0.0052,相关系数r=0.9993.检出限为4.16×10-5g·m L-1该方法在室温下进行,操作方便,可用于饮用水中痕量溴酸根的测定.     

催化过氧化氢氧化茜素红褪色光度法测定痕量钴

基于pH=9.0的NH3-NH4Cl缓冲液中与T=40℃的条件下,Co(II)催化过氧化氢氧化茜素红的褪色反应,建立了催化过氧化氢氧化茜素红褪色光度法测定痕量Co(II)新方法,对测量波长、试剂浓度、反应温度、反应时间及共存离子的干扰等条件进行探讨和选择.该催化褪色反应的速率常数k=2.70×10-4S-1,表观活化能E=96.79KJ/mol.Co(II)含量在0.50～5.2μg/L范围内符合比尔定律,其线性回归方程为㏒(A0/Ai)=0.0138CCo(II)(μg/L)–0.0003,r=0.9994,检出限为0.33μg/L(3Sb/k,n=11).本方法已成功用于叶绿素钴盐样品中Co(II)含量的测定,回收率为102.1～102.6%.     

催化褪色光度法测量痕量锌

基于聚丙烯酸钠存在的条件下,锌对高碘酸钾氧化钙黄绿素褪色有明显的催化作用及聚丙烯酸钠对此催化反应有显著的增敏效应,从而建立了聚丙烯酸钠增敏催化高碘酸钾氧化钙黄绿素褪色光度测量痕量锌的新方法.在0.040～2.00μg/L范围内,锌离子浓度与ΔA值符合比耳定律,线性回归方程为ΔA=0.04982+0.06828CZn2+ (μg/L),r=0.9992,检出限1.9×10-11g/mL.用于水样和人发样中锌含量的测定,结果满意.     

茜素红荷移反应测定多潘立酮

在水溶液和室温下,电子给体多潘立酮与电子受体茜素红发生电荷转移反应形成稳定的1:2荷移配合物.该配合物的λmax=521 nm,在此波长下,溶液吸光度(A)与溶液中多潘立酮浓度(C)成正比关系,表观摩尔吸光系数为7.0×103 L/(mol·cm).据此建立了多潘立酮的分光光度测定法,线性回归方程为A=0.0269C+0.1201,多潘立酮浓度在1.5～200μg/mL范围内与吸光度呈线性关系,相关系数,r=0.9990.方法检出限为0.426 μg/mL.用该方法测定吗丁啉药片样品中的多潘立酮含量,相对标准偏差为0.20%(n=11),结果与药片标示量一致,方法回收率在97%～98%之间.     

微波流动注射催化分光光度法测定微量铱

在酸性条件下 ,铱对高碘酸钾氧化 2 (2 胂酸基苯偶氮 ) 7 (2 ,6 二溴 4 甲基苯偶氮 ) 1,8 二羟基 3,6 萘二磺酸 (简称偶氮胂 DBM)褪色的反应具有催化作用 ,且微波场对该反应有强烈的加速作用。据此本文首次建立了测定微量铱的微波流动注射催化分光光度新方法。在 0 .0 2～ 0 .2 μg/mL范围内 ,铱的浓度CIr与log(A0 /A)具有良好的线性关系 ,回归方程为log(A0 /A) =4.5 0CIr(μg/L) - 0 .0 16 ,相关系数和检测限分别为r=0 .9979和 1.0× 10 -8g/mL .进样频率为每小时 5 0次 .该方法用于实际样品中铱的测定 ,结果令人满意 .     

阻抑溴酸钾氧化丁基罗丹明B褪色光度法测定痕量苯酚

用停流动力学分析技术研究了H2SO4介质中苯酚抑制BrO-3氧化丁基罗丹明B褪色的反应,并探讨了其反应机理;基于苯酚对该反应诱导期的影响作用,建立了停流-抑制动力学褪色光度法测定痕量苯酚的新方法.该方法测定苯酚的检出限为1.3×10-9 g/L,线性范围为0.3～15.0 μg/L,11次测定苯酚(5.0 μg/L)的相对标准偏差为2.1%;用于测定河水和工业废水样品中的痕量苯酚,结果满意.     

火焰原子吸收光谱法测定云冈石窟岩缝结晶物中的Mg

采用火焰原子吸收光谱法对云冈石窟岩缝结晶物中Mg的含量进行了测定.样品研细过筛后,采用3 mol/L HNO3溶解,用锶溶液做干扰抑制剂,标准曲线法测定.Mg的浓度在0.00～0.60 μg/mL之间与吸光度有良好的线性关系,线性回归方程为A=1.282 2 c-0.001 4,相关系数r=0.998 9.相对标准偏差为1.36％(n=10),方法的检出限为0.002 3 μg/mL (3σ),加标回收率为96.4％～100.2％.     

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.     

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.     

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。     

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.     

海南岛地体及其毗邻陆缘晚中生代—新生代古地磁研究和构造演化

本文叙述了对海南岛及其毗邻大陆边缘白垩纪到第四纪地层岩石进行古地磁研究的全部工作过程。通过分析岩石中剩余磁矢量的磁偏角及磁倾角的变化,提出海南岛白垩纪以来经历的构造演化模式如下:早期伴随顺时针旋转而向南迁移,后期伴随逆时针转动并向北运移。联系该地区及邻区的地质、地球物理资料,对海南岛上述的构造地体运动提出以下认识:北部湾内早期有一拉张作用,主要是该作用使湾内地壳显著伸长减薄,形成北部湾盆地。从而导致了海南岛的早期构造运动,而海南岛后期的构造运动则主要是受南海海底扩张的影响。海南地体运动规律的阐明对于了解北部湾油气盆地的形成演化有重要的理论和实际意义。     

《Chinese Science Bulletin》SUBJECT INDEX TO VOLUME 59(2014)

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Achieving Unusual States of Matter Under High Pressure

The elongation method,originally proposed by Imamura was further developed for many years in our group.As a method towards O(N)with high efficiency and high accuracy for any dimensional systems.This treatment designed for one-dimensional(ID)polymers is now available for three-dimensional(3D)systems,but geometry optimization is now possible only for 1D-systems.As an approach toward post-Hartree-Fock,it was also extended to     

Exciton Seebeck in Molecular Systems

Various applications relevant to the exciton dynamics,such as the organic solar cell,the large-area organic light-emitting diodes and the thermoelectricity,are operating under temperature gradient.The potential abnormal behavior of the exicton dynamics driven by the temperature difference may affect the efficiency and performance of the corresponding devices.In the above situations,the exciton dynamics under temperature difference is mixed with