碳质金矿中金的化学物相分析方法改进

为了解决碳质金矿金化学物相分析结果与选矿试验结果不符的问题,基于岩矿鉴定和测试结果对分析流程进行改进。方法改进后测试项目包括裸露金和半裸露金、有机碳石墨包裹金、碳酸盐包裹金、褐铁矿包裹金、黄铁矿包裹金、石英和硅酸盐包裹金6项。有机碳石墨包裹金选用Na_2S_2O_3–CuCl_2–NH_4OH–NH_4Cl体系为浸金剂,取代I_2–NH_4I体系,该体系中金的测定采用铜置换原子吸收法。裸露金半裸露金、有机碳石墨包裹金和黄铁矿包裹金的相和为82.34%,与选矿试验金精矿实际回收率(75.83%)基本吻合。改进后的方法适合碳质金矿金化学物相分析。     

矿物及炉渣中钒钛物相分析概述

概述了我国十多年来矿物及炉渣中钒、钛的物相分析。用扫描电子显微镜和场离子显微分析查明炉渣中有Ti_4CS_2和Fe·V_2O_3、(V、Ti)C_2等新的化学物相。钒、钛的化学物相分析研究结果表明,可以定量测定炉渣和矿物中V(金属)、VC、VN、FeO·V_2O_3、TiC、TiN、TiO与Ti_2O_3化合物相和钒渣中各价态VO、V_2O_3、VO_2化合物的量及钒钛磁铁矿(Fe_3O_4·T(?)O_2)、铁铁矿(FeO·TiO_2)和金红石(a-TiO_2)的量。     

中国化学物相分析研究的新成就(下)

分两部分介绍了我国化学物相分析近十余年来研究的新成就。第二部分（下）则对物料物质组成的相态与元素(Fe,I,Mn,Mo,Na,P,Re,S,Sb,Se,Si,Sn,Sr,Ti,U和V等)价态分析、赋存状态分析以及非金属矿物相分析等的研究现状,分别予以简要评述。同时对其存在的问题和进一步研究的方向也进行了讨论。引用文献114篇。     

我国化学物相分析的进展

对我国化学物相分析的最新成就和进展作了简要评述,内容包括概述、物质相态分析、元素赋存状态分析以及非金属矿物相分析等。引用近十年来的主要文献１００篇。     

云母族矿物八面体化学成分与层面X射线衍射特征

运用粉末晶体结构分析的原理，从白云母、金云母和黑云母3种矿物的X射线粉末衍射图中得出云母族矿物的层面衍射强度变化与八面体化学成分改变的规律；利用相对衍射强度I002／I003将二八面体型云母与三八面体型相区分，用相对强度I004／I003分析三八面体型云母八面体中成分的变化。     

化学物相分析中溶剂的选择

化学物相分析是考查物质(矿石、矿物原料和冶金产品等)组成的一种手段;四十多年来,由于分析工作者们的辛勤劳动,使这种分析方法的应用范围逐渐扩大,对方法本身的选择性也得到了不断的完善和提高,因而在现代冶金工业的发展上起到了重要的作用。化学物相分析的任务与一般化学分析不同,它不是测定目的物中某一元素的全量,而是分别测定其中某一元素几种存在状态的单独含量,因此,这一要求通常是通过选用专门的溶剂,使同一元素的几种组成中某一组成选择性地溶解来实现的。     

钒钛物料中钒钛化学物相分析现状及最新进展

主要概述了钒钛炉渣原料中价态钒(V2+,V3+,V4+,V5+),低价钛(Ti 2+,Ti 3+),金属钒(MV),氮化钒(VN),碳化钒(VC),碳化钛(TiC),氮化钛(TiN)及钢铁材料里固溶钒(Vsol),氮化钒(VN),碳化钒(VC),固溶钛(Tisol),碳化钛(TiC),氮化钛(TiN)等的化学物相分析的现状流程及最新进展,为从事钒钛化学物相分析方法研究者提供了参考依据。     

电感耦合等离子体原子发射光谱法测定钨矿石物相分析中各相

正我国是世界上钨矿储量最丰富的国家,主要有石英脉型黑钨矿床、矽卡岩型白钨矿床、斑岩型钨矿等类型。已知的钨矿石有15种以上,其中仅黑钨矿和白钨矿具有工业价值[1]。化学物相分析方法是基于化合物化学性质的不同,利用化学分析的手段研究物相组成和含量的方法[2-3]。通常情况下,钨矿石的化学物相分析需测定钨华(WO3)、白钨矿(CaWO4)及黑钨矿[(Fe,Mn)     

《实用地质分析标准物质手册》(第二版汉英对照)

编者收集整理了当今地质分析所用的标准物质647个,按其特征和不同应用分成6个部分介绍,即元素整体分析标准物质、超细粒度标准物质、化学物相和元素形态分析标准物质、微区原位分析标准物质、同位素及地质年代学分析标准     

《实用地质分析标准物质手册》(第二版 汉英对照)

编者收集整理了当今地质分析所用的标准物质647个,按其特征和不同应用分成6个部分介绍,即元素整体分析标准物质、超细粒度标准物质、化学物相和元素形态分析标准物质、微区原位分析标准物质、同位素及地质年代学分析标准     

Neutral diterpenoids of oleoresins of five species of conifers of Transcarpathia

The compositions of the neutral diterpenoids of the oleoresins of five species of conifers growing in the Transcarpathia have been studied. It has been found that the oleoresins ofAbies alba M.,Larix decidua M., andPicea excelsa L. contain more than 50% of neutral diterpenoids. The group and qualitative compositions of the oxygen-containing diterpenoids have been determined. In the oleoresins ofAbies alba,Picea excelsa, andPicea abies tertiary alcohols — cis-abienol and isocembrol — predominate, while inLarix decidua the main component is the hydroxy ester larixyl acetate. Primary alcohols related to the resin acids have been found in all the oleoresins investigated. Features of the distribution of diterpenoids according to the species of conifers have been revealed. The results obtained are necessary for the chemotaxonomy of conifers of the family Pinceae.Novosibirsk Institute of Organic Chemistry, Siberian Branch, Academy of Sciences of the USSR. Translated from Khimiya Prirodynkh Soedinenii, No. 6, pp. 812–816, November–December, 1988.     

利用手持技术改进测定乙醇分子结构实验

利用压强传感器代替排水集气法,改进测定乙醇分子结构实验的仪器装置,并探索最佳反应条件。另外,设计两个空白实验,结合压强变化曲线对实验误差进行相关讨论。     

光谱仪测试范围的扩展

由于石化行业的生产需要，其材质的使用具有多样性和广泛性，经常会出现顾客委托的测试样品的一个或几个元素跨越光谱仪现有测试程序测量范围的情况。本法通过对光谱仪测试原理的认识，根据光谱仪的测试能力及标样的采集，实现了一个或几个元素测量范围的扩展，并对其测量的影响因素进行了研究。     

Effect of the Method of Modification of Zeolite X on Selectivity of Catalytic Methylation of Toluene

Theoretical and Experimental Chemistry - The effect of the method of modification of catalysts based on zeolite X by cesium and magnesium cations (ion exchange and impregnation) on the selectivity...     

Dichroism of absorption and polarization of phosphorescence of molecules of the closed form of nitrobenzospirothiopyran

The spectral-polarization characteristics of absorption and phosphorescence of molecules of the initial form of nitro-substituted indolinospirobenzothiopyran were studied in oriented polyethylene films and in solutions with different polarity. An oscillator model of the electron transitions responsible for the formation of absorption and luminescence spectra was suggested. It was established that the principal differences in the spectral and photophysical properties of the compound studied and its oxygen-containing analog are associated with the fact that the electronegativity of the S atom is lower than that of the O atom. Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 6, pp. 1143–1146, June, 1997.     

Influence of viscosity of medium on processes of oxygen quenching of excited states of mesoporphyrin

The oxygen quenching rate constants for singlet and triplet excited states of the dimethyl ester of mesoporphyrin IX increase with decreasing viscosity of the medium and reach a maximum at a viscosity of approximately 0.4 mPa·sec, after which the rate constants begin to decrease. The drop in rate constant with increasing fluidity of the medium may be related to a nonequilibrium character of the elementary act in the interaction of the reactants in the solvent cage. In viscous media such as isopropyl alcohol, isobutyl alcohol, and isoamyl alcohol, the reaction radius is greater than the sum of the radii of the reacting particles. The long-range character of these processes is due to the relatively weak dependence of the quenching probability on distance.Translated from Teoreticheskaya i Éksperimental'naya Khimiya, Vol. 25, No. 2, pp. 161–167, March–April, 1989.     

Synthesis of tetrabenzoporphins of the basis of isoindoline

Chemistry of Heterocyclic Compounds -