痕量金现场快速简便测试方法

本文简要介绍了地质勘探工作中地质样品痕量金的快速测试方法。试样经酸溶(王水加热或HCl-KClO3冷溶溶样),活性炭富集,用硫代米蚩酮(TMK)显色,小体积水相目视比色。该方法快速、简便,适宜野外工作对样品的直接现场分析。     

地球化学样品中微量金的快速测定

本文利用泡沫塑料定点吸附,TMK直接显色的斑点法,测定地球化学样品中微量金。文中提出:样品经王水溶解后,用移液管吸取一定量溶液,将移液管插立在泡沫塑料上使溶液缓缓流过。此时金被固定吸附在移液管下口孔径与泡沫塑料接触的面积上,然后借被吸附的金与TMK直接显色的特性,完成测定的目的。方法简单,快速、     

地质样品中金、银的野外快速分析

试样经硝酸＋氯化钠＋高锰酸钾＋氟化氢铵溶样体系封闭冷浸，用泡沫塑料富集金（银），用丙酮进行解脱，在pH=4.5-的乙酸－乙酸铵缓冲溶液中，有表面活性剂存在下，用金（银）试剂显色测定金（银），该方法具有简单，快速，准确的特点。     

痕量金的快速测定法

采用钯作基体改进剂,用石墨炉原子吸收法直接测定了化探样品中的痕量金。     

钢中钼的快速分析

采用高氯酸溶样，在酸性介质中用抗坏血酸将钼还原成５价，通过钼与硫氰酸铵作用，生成琥珀色络合物，可以进行钼的比色分析。该法简便，稳定性好，约１６０～２１０ｓ即可完成单样分析，结果偏差均在国标范围内。     

金钨杂多酸—罗丹明B缔合显色反应的研究

金钨杂多酸－罗丹明Ｂ缔合显色反应的研究李祟宁，李祖碧，杜超（云南大学成人教育学院，昆明，６５００９１）徐其亨（云南大学化学系，昆明，６５００９１）三苯甲烷染料－卤金酸或氯化亚锡络阴离子离子缔合物［１，２］，灵敏度高，但稳定性差（特别是温度影响大），应...     

中国金分析50年

评述了中国金分析测定５０年（１９４９￣１９９９年）的发展历程和取得的主要成就。其内容涉及到金试样的前处理,分离富集和各种测定方法。５０年来,共发表２０００多篇有关金分析 论文,确立了符合中国国情,具有中国特色的金分析测定方法。这些方法适用于测定各种分析对象有中不同量级的金。     

碳酸根和碳酸氢根野外现场快速检测仪的研发与应用

CO₃^2-和HCO₃^-含量能够反映碳的地球化学行为和碳循环特征,是重要的地球化学指标。本文利用双电极测量技术,研发一套测量CO₃^2-和HCO₃^-含量的小型野外现场快速检测仪,以一键式操作方式自动完成水质样品中CO₃^2-和HCO₃^-含量的快速检测,满足了野外现场调查要求,提高了野外现场测试效率。该仪器具有较低的检出限,CO₃^2-仪器检出限为0.001 mg/L,HCO₃^-仪器检出限为2.5 mg/L;对1×10^-3 mol/L CO₂标准溶液平行测量7次,CO₃^2-、HCO₃^-分析结果的相对标准偏差(RSD,n=...     

黄金租赁业务在黄金行业中的应用

简要介绍了近几年黄金租赁业务的迅速发展以及黄金租赁业务之所以受到黄金生产和加工企业的追捧的原因,进一步举例分析了各种黄金租赁方案的优缺点以及将黄金租赁与黄金远期买卖相互结合操作的创新方式和特点。     

二苯羟乙酸在痕量金的催化反应—示波极谱分析中的应用

在稀硫酸介质中及加热下，Ａｕ＾３＋对Ｃｅ＾４＋氧化Ｈｇ２＾２＋反应具有强烈催化作用；加入二苯羟乙酸以还原指示反应中未反应的Ｃｅ＾４＋，生成的二苯甲酮于－０．７８Ｖｖｓ。ＳＣＥ产生一灵敏的二阶导数波。据此，采用单扫描示波极谱法对催化测定金的各种影响因素进行了研究，建立了一个检出限和测定范围分别为０．２ｎｇ／ｍｌ和０．３８－７．７ｎｇ／ｍｌ金的催化反应—示波极谱分析新方法，已用于矿样中痕量金的测定。     

黄金浸出剂的分子设计研究(I)

讨论了浸金络合剂的分子设计四要素,即δ因素(配位原子选择),π因素(特征官能团选择)、亲水基因素和空间因素,并对众多的有机小分子化合物开展了分子设计的探索工作。     

Gold recovery from dilute gold solutions using DEAE-cellulose

The present work investigates gold recovery using DEAE-cellulose, a common biopolymer derivative, from synthetically prepared diluted gold-bearing solutions of 50 ppm. The effects of different recovery parameters on gold recovery efficiency were studied in detail. It was demonstrated that gold recovery efficiency increased with an increasing amount of sorbent, as well as increasing contact time. A gold recovery efficiency of 99% was attained under conditions of 20–40 g DEAE-cellulose per liter at a shaking rate of 130 rpm for 30 min at room temperature. On the other hand, with smaller amounts of sorbent (6 g/l), it was also possible to recover gold from the solution with 99% efficiency when the reaction temperature was increased to 60 °C. The shaking rate and temperature were demonstrated to play a vital role in the recovery process. It was also found that gold recovery by DEAE-cellulose is an intermediate-controlled process with an activation energy of 37.11 kJ/mol. The XRD pattern and SEM images revealed that the recovered gold was in the metallic form.     

表面活性剂对金属置换硫脲金络离子溶液中金的影响

研究了表面活性剂对从酸性硫脲金（Au(Tu)2^ )溶液中金属还原置换金的影响。少量表面活性剂对金还原过程有明显的促进使用，可使金的置换率显著提高。实验筛选出了十二烷基硫酸钠（SLS）铝粉还原体系，金的置换率达99%，提出了一种在低浓度硫脲金溶液中，深度置换回收金的方法。     

黄金价格波动对黄金冶炼企业的影响分析

随着全球性金融危机的爆发,世界经济增速明显放缓,作为货币储备手段的黄金日益受到广泛关注,而黄金价格经过一路走高的强势后逐步下跌且呈现震荡状态。文中简要概述了黄金价格波动的影响因素,并在此基础上分析了黄金价格波动对黄金冶炼企业产生的种种影响。     

Structure-activity relationship in water-gas shift reaction over gold catalysts supported on Y-doped ceria

The utilization of pure hydrogen as an energy source in fuel cells gave rise to renewed interest in developing active and stable water-gas shift catalysts. Gold catalysts have proven to be very efficient for water-gas shift reaction at low temperature. The aim of the present study was to investigate the effect of:(i) different preparation methods(impregnation and coprecipitation) to obtain a modified ceria support,and(ii) the amount of Y_2 O_3(1.0 wt%, 2.5 wt%, 5.0 wt% and 7.5 wt%) as dopant on the water-gas shift activity of Au/CeO_2 catalysts. An extended characterization by means of S_(BET), XRD, HRTEM/HAADF, FTIR,H_2-TPR and CO-TPR measurements in combination with careful evaluation of the catalyst behavior allowed to shed light on the parameters governing the water-gas shift activity. The catalysts show very high activity(90% CO conversion) in the temperature range 180-220 ℃,with a slightly better performance of the gold catalysts on supports prepared by impregnation. The decreased activity with increasing Y_2 O_3 concentration is related to the hindering of oxygen mobility due to ordering of surface oxygen vacancies in vicinity of segregated Y~(3+). The effect of catalyst pre-treatments and the stability of the best performing samples were examined as well.     

搭建市场营销平台繁荣黄金交易市场

在黄金产业经营市场化、国际化的新形势下,针对目前黄金产品营销中存在的问题,研究和探讨了如何依托上海黄金交易所这一平台,发挥优势,扬长避短,将灵宝市建设成为全国知名、西北最大的黄金生产、贸易、物流中心,促进区域经济发展。     

缅甸高林—文多地区金矿床地质特征与成因分析

高林-文多地区是缅甸中央火山弧带上金矿的集中产出区域,通过对高林-文多地区典型矿床介绍,总结出该区金矿化主要赋存于安山岩、闪长岩、花岗岩以及砂岩中,受NE-NNE向断裂以及NW向断裂控制明显,岩浆期后的热液活动与金矿化密切相关。矿床类型从西向东依次为蚀变岩型→石英脉-蚀变岩型→石英脉型的分带特点,反映了不同构造层次、不同岩性介质是确定矿床类型的重要因素。金矿体的形成在收缩挤压到旋转走滑的构造转换的背景下,岩浆活动萃取围岩中流体,在构造有利位置富集成矿。     

Psychological professional gold medal award: Kenneth E. Clark.

The Gold Medal Awards, which include a check for $2,000 and a gold medallion, are given to American psychologists who are 65 years of age or older and residents of North America in recognition of a distinguished and long-continued record of accomplishments in three individual areas: professional, scientific, and public interest. This article provides a citation and a biography for Kenneth E. Clark, the 1986 Psychological Professional Gold Medal Award winner. (PsycINFO Database Record (c) 2010 APA, all rights reserved)