混合表面活性剂存在下锰的高灵敏显色反应研究   总被引：2，自引：0，他引：2  

尹家元  杨光宇 《岩矿测试》1998,17(4):282-284

研究了碱性介质中,Ｍｎ（Ⅱ）被空气氧化生成Ｈ２ＭｎＯ３,然后在Ｈ３ＰＯ４介质中,Ｃｕ（Ⅱ）和阳离子型有机相／水相微乳液（ＣＴＭＡＢ／戊醇／正庚烷／水）的存在下,Ｍｎ（Ⅳ）与二安替比林对乙氧基苯基甲烷（ＤＡｐＥＭ）生成橙色产物,λｍａｘ为４５０ｎｍ,ε＝１．９５×１０５Ｌ·ｍｏｌ－１·ｃｍ－１。Ｍｎ（Ⅱ）的质量浓度在０～３２０μｇ／Ｌ内符合比尔定律。方法用于合金中锰的测定,结果与标准值符合,５次测定结果的ＲＳＤ＜３％。  相似文献   

A new VLBI observation of an OH maser in a post-asymptotic giant branch star using the European VLBI Network     

Yu Zhi-yao 《Monthly notices of the Royal Astronomical Society》1998,299(2):389-391

OH 17.7 − 2.0 is a post-asymptotic giant branch star that is of great interest. The 1612-MHz OH emission from OH 17.7 − 2.0 is characterized by a double-peaked spectrum. Such a line profile has been assumed to represent maser emission from an expanding circumstellar shell. A new VLBI observation of the OH maser in OH 17.7 − 2.0 has been made using the European VLBI Network, and a relative position map of the eight OH maser spots has been obtained. Using the relative position map, it is found that the eight OH maser spots are distributed on an expanding circumstellar shell. The parameters of the expanding circumstellar shell have been obtained.  相似文献   

A smog chamber for studies of the reactions of terpenes and alkanes with ozone and OH     

F. Nolting  W. Behnke  C. Zetzsch 《Journal of Atmospheric Chemistry》1988,6(1-2):47-59

The design and performance of a smog chamber for the study of photochemical reactions under simulated environmental conditions is described. The chamber is thermostated for aerosol experiments, and it comprises a gas chromatographic sample enrichment system suitable for monitoring hydrocarbons at the ppbv level. By irradiating NO _x /alkane-mixtures rate constants for the reaction of OH radicals with n-alkanes are determined from n-pentane to n-hexadecane to be (k±2)/10^–12 cm³ s^–1=4.29±0.16, 6.2±0.6, 7.52 (reference value), 8.8±0.3, 10.2±0.3, 11.7±0.4, 13.7±0.3, 15.1±0.5, 17.5±0.6, 19.3±0.7, 22.3±1.0, and 25.0±1.3, respectively at 312 K. Rate constants, (k±2)/10^–17 cm³ s^–1, for the reaction of ozone with trans-2-butene (21.2±1.0), cis-3-methylpentene-(2) (47.2±1.7), cyclopentene (62.4±3.5), cyclohexene (7.8±0.5), cycloheptene (28.3±1.5), -pinene (8.6±1.3), and -pinene (1.4±0.2) are determined in the dark at 297 K using cis-2-butene (13.0) as reference standard.  相似文献   

海上围隔进行羟基杀灭赤潮生物的研究     

白敏冬  张芝涛  吕吉斌  杨波  白希尧 《海洋科学》2006,30(8):54-57

采用强电场电离H2O、O2方法,在分子层次上加工成高浓度羟基自由基(OH.)溶液,喷洒在有赤潮生物的海面上,当海水的羟基质量浓度达到0.68 mg/L时,致死洛氏角刺藻(Chaetoceros lorenzianus)等31种赤潮生物效率达到99.89%,致死细菌、弧菌效率达到100%,致死膝沟藻孢囊、多甲藻孢囊效率达到100%;赤潮生物叶绿素a含量低于检测方法低限值;剩余OH.分解成H2O和O2;尸体将分解成CO2、H2O和微量无机盐。从试验数据表明,OH.是治理赤潮有效可行的绿色新方法。实现了治理赤潮以及加工羟基过程的零污染、零废物排放、零残留物。  相似文献   

基于红外光谱技术的内蒙古达斯矿区蚀变地质填图及其勘查指示意义     

李兵院  郭娜  支立佳  杨文文  谢周  王潇  魏德贤 《地质学报》2024,98(2):623-635

红外光谱技术,辅以显微镜下鉴定和矿物地球化学分析,通过系统采集达斯矿区地表岩石与钻孔岩芯样品,开展精细蚀变矿物填图,利用绢云母矿物Al- OH基团在2200 nm附近的光谱变化特征,开展勘查区及其外围的找矿预测。结果显示：① 研究区主要矿物为钠长石、微斜长石、石英、绢云母、高岭石、蒙脱石和绿泥石,另含有少量明矾石、电气石、石膏和黑云母等;② 电气石、明矾石、高岭石和绢云母矿物及其组合与成矿关系密切,具有中硫化浅成低温热液型矿床蚀变矿物组合特征;③ 目前已发现的Pb矿（化）体,主要产于300 m以浅,矿体底板为一套蒙脱石+绿泥石为主的蚀变矿物组合。矿体赋存于绢云母（高岭石+少量明矾石+电气石）蚀变带内,蚀变分带特征（矿化体中心向外）表现为：绢云母化→绢云母+高岭石（+少量明矾石+电气石）→绢云母+蒙脱石→蒙脱石+绿泥石;④ 区内长波绢云母指示了深部热源的位置,短波绢云母反映出热液流体与浅部大气降水的混合作用,根据绢云母矿物Al- OH波长插值填图及矿物组合特征变化确定了成矿流体pH值偏中性、温度逐渐降低的变化趋势;⑤ 绢云母矿物在2200 nm附近的光谱吸收深度与Pb品位之间呈正相关关系,10%吸收深度阈值可区分具有相似Al- OH吸收特征的绢云母和高岭石矿物;⑥ 结合GIS空间叠加分析,认为勘查区外围仍具一定找矿潜力。  相似文献   

Collisional Quenching of OH Radio Emission from Comet Hale-Bopp     

Schloerb  F. P.  Devries  C. H.  Lovell  A. J.  Irvine  W. M.  Senay  M.  Wootten  H. A. 《Earth, Moon, and Planets》1997,78(1-3):45-51

Observations of comets in the 18-cm OH transitions offer a means to probe gas production, kinematics, and OH excitation in comets. We present initial results of OH observations of comet Hale-Bopp obtained with the NRAO 43 m antenna located in Greenbank, WV. Maps of the emission provide strong constraints on the amount of quenching of the inversion of the OH ground state Λ-doublet in the coma. Analysis of the total radio OH flux and maps of its radial brightness distribution indicate a quenched region on the order of ∼500,000 km during March and April 1997. This large value is generally consistent with previous observations of radio OH quenching in lower production rate comets when the high production rate of comet Hale-Bopp is considered. This revised version was published online in July 2006 with corrections to the Cover Date.  相似文献   

二辉橄榄岩中辉石的"水"的测定     

降大勇 《矿物学报》2000,20(1):40-43

本文中作者采用红外光谱方法对雅鲁藏布江蛇绿岩带拉昂错超基性岩体二辉橄榄岩中的单斜辉石进行了测试研究。结果表明 ,雅鲁藏布江蛇绿岩带拉昂错岩体二辉橄榄岩中的单斜辉石为透辉石 ;该透辉石中含有一定量的结构水 ;并且 ,其高频带相关的结构OH含量是 1 4 6× 1 0 -6。透辉石成分的这种特殊性 (含有结构OH)恰恰是其特殊的高温高压的幔源生成环境的反映。  相似文献   

W3(OH)区域H2O脉泽的快速时变     

徐烨  郑兴武  张福俊  俞志尧  韩溥 《中国天文和天体物理学报》2000,20(2)

通过对 Ｗ３（ＯＨ）区域 ２２ ＧＨz Ｈ_(２)Ｏ脉泽源的短时间跟踪观测,探测到速度为-５２．８ ｋｍ／ｓ子谱的流量密度呈线性下降趋势,变化时标约为 １９天．同时也观测到了整个脉 泽源的谱线宽度与该子谱的强度之间的相关变化．这些现象可能是由脉泽云之间的相 互碰撞导致脉泽抽运率的变化所引起的。  相似文献   

水钠锰矿吸附Pb2+亚结构变化的红外光谱研究   总被引：1，自引：0，他引：1  

赵巍  刘凡  冯雄汉  谭文峰  邱国红  陈秀华 《地球化学》2011,40(1):99-107

利用红外光谱表征了吸附Pb2+前后的不同锰氧化度的水钠锰矿,结合二次求导退卷积方法确定实际的红外吸收带中心,分析了水钠锰矿红外吸收带的归属.结果表明,供试样品的899～920 cm-1红外吸收带源于八面体空穴处OH的弯曲振动,随着水钠锰矿锰氧化度的降低,空穴处与OH配位的Mn4+被Mn3+替代的数量增多,OH弯曲振动频...  相似文献   

AGB stars in the Magellanic Clouds     

P. R. Wood 《Astrophysics and Space Science》1994,217(1-2):121-130

The stars that will be detectable in the Magellanic Clouds by the DENIS and 2MASS near infrared surveys are enumerated. All thermally-pulsing AGB stars will be observable in I, J, H and K, along with the top two magnitudes of both the early-AGB and the first giant branch. All carbon stars will be visible, and normal (N type) C stars will be easily distinguished by their large J-K colours. However, it will not be possible to separate faint, warm C stars from K and M stars using the photometry alone. Photometry of AGB stars in clusters will allow an accurate evaluation of the AGB tip luminosities as a function of initial mass. Random phase K magnitudes of LPVs and Cepheids should provide a better measure of the LMC tilt and distortions in the SMC. The K survey should turn up 100 to 150 objects undergoing superwind mass loss, these objects being OH/IR stars and the dust-enshrouded C star equivalents of OH/IR stars. It is shown that crowding should not be a problem even in the LMC bar.  相似文献