Determination of Copper in High Purity Copper

Copper ions play a key role in Industry, Agriculture,National Defense and Scientific Research. The flash furnace copper cooling jackets manufactured by our yard require perfect inside quality,content of copper reaches 99.6-99.9 percent. An accurate and rapid method of determining copper content is needed for large bulk production.     

Sol-Gel Derived Silica Films with Ultrafine Copper, Copper Sulfide and Copper Selenide Particles

A development of the silica-based sol-gel materials in the form of films containing ultrafine copper compounds and metallic copper is presented. Semiconductor nanoparticles with new optical features due to size effects and unique chemical properties of copper are produced. The chemical state of copper-containing dopants was manipulated by the sequence of chemical transformations monitored with XRD and optical absorption spectroscopy and discussed together with other recent data (XPS, TEM). A number of nanocrystalline phases of sulfides and selenides controllable by preparation conditions were detected in the films. The chemical composition of the dopants controls optical absorption both in the visible and near IR ranges.     

铜锍中铜含量测定的研究

根据铜锍的组成结构特点,建立了一种测定铜锍中铜含量的方法,重点讨论了混合酸对铜锍进行溶解的前处理及样品滴定过程。方法铜的测定范围：4.80%~32.00%,回收率：97.70%~101.26%,精密度即标准偏差：0.026 %~0.10%。该方法能够较好地解决铜锍中铜含量测定难的问题。     

铜催化剂有效表面积的测定

 综述了几种测定铜催化剂有效表面积的方法．N2O前沿反应色谱法（RFC）对设备要求简单，操作简便，测定结果重现性好，是测定铜催化剂中铜的表面积的有效方法．给出了装置原理图和适当的实验条件．     

碘量法测定再生铜物料中铜的含量

采用硝酸、硫酸和尿素溶解样品,探讨了铅含量、氟化氢铵掩蔽剂的使用量和酸度对测定结果的影响,建立了再生铜物料中铜的碘量分析法。结果表明,铅含量为5%以下、pH=5~6时,测定结果稳定,碘量法加标回收率为98.6%~101.3%,相对标准偏差(RSD,n=12)为0.26%。与原子吸收分光光度法对比,测定结果吻合,表明碘量法测定再生铜物料铜含量准确、快速、稳定、可靠,适用再生铜的检测。     

碱式硫酸铜与氢氧化铜的相互转化及纯净氢氧化铜的制备条件

通过实验定量研究了Cu4(OH)6SO4与Cu(OH)2相互转化的特点及纯净Cu(OH)2制备的条件。研究结果表明,Cu4(OH)6SO4与Cu(OH)2之间能够相互转化,且转化相对缓慢;提高CuSO4浓度有利于Cu(OH)2向Cu4(OH)6SO4转化,提高NaOH浓度有利于Cu4(OH)6SO4向Cu(OH)2转化;纯净Cu(OH)2的制备方法为CuSO4溶液滴加到NaOH溶液中,且NaOH过量15%以上。     

碘量法测定铜锍中铜含量

根据铜锍的组成结构特点,建立了一种测定铜锍中铜含量的方法,重点讨论了混合酸对铜锍进行溶解的前处理及样品滴定过程。在4.80%~32.00%铜的测定范围内,加标回收率为97.70%~101.26%,相对标准偏差为0.24%~0.53%。方法能够较好地解决铜锍中铜含量测定难的问题。     

基于铜/银纳米簇检测铜离子的方法研究

通过设计不同富含G碱基的DNA序列,探究了G碱基对核酸-铜/银纳米簇(DNA-Cu/AgNCs)的荧光增强效应,并建立了铜离子的荧光检测方法。结果发现,在富含C碱基序列模板的5’端增加G5序列后,制备得到的铜/银纳米簇的荧光强度显著增强。同时,该DNA-Cu/AgNCs的荧光可被Cu²⁺和Hg²⁺猝灭。通过NaBH₄掩蔽Hg²⁺实现了对Cu²⁺的特异性检测。该方法检测Cu²⁺的线性范围为0.01～5.0μmol/L,检出限为5.0 nmol/L。方法具有简单快速、选择性高、成本低等优点,可用于实际样品测定。     

铜在储氢合金表面包铜电极中的行为

在密封的电池体系中，包铜储氢合金电极具有较好的抗氧化能国和；而在强碱性溶淤 中，铜在电极工作的电位范围内具有一定的稳定性，但当扩展扫描范围，将出现铜的氧化不这原反应。     

碘量法测定铜冶炼烟尘中铜含量

研究了铜冶炼烟尘中铜含量的测定方法,试料用盐酸、氢氟酸、硝酸、高氯酸及硫酸分解,氢溴酸除去砷、锡、锑,硫酸除去硒的干扰。进一步对滴定条件和共存元素的干扰及消除进行了实验,最终确定了最佳条件。按照实验方法测定6个铜冶炼烟尘样品中铜含量,结果的相对标准偏差为0.22%～0.65%,精密度高,准确度好。样品加标回收率在98.9%～100%,适用于铜冶炼烟尘中铜含量为5.00%～65.00%的样品测定。     

铜是黄色的

本刊1989年第3期发表了《关于乙醇中含水检验的商榷》一文后,陆续收到李小平、刘怀乐等同志的文章,从实验和理论分析上得出了不同的结论。现摘登,供参考。     

铜与人类文明

铜是人类使用最早的金属。铜及其化合物在人类生产和生活中有着极其广泛的应用。本文从铜的使用历史、铜及其化合物、铜的广泛应用、铜的冶炼等方面论述了铜在人类文明的发展和推动科学技术的进步中的重要作用。     

Copper oxide nanocrystals

It is well-known that inorganic nanocrystals are a benchmark model for nanotechnology, given that the tunability of optical properties and the stabilization of specific phases are uniquely possible at the nanoscale. Copper (I) oxide (Cu(2)O) is a metal oxide semiconductor with promising applications in solar energy conversion and catalysis. To understand the Cu/Cu(2)O/CuO system at the nanoscale, we have developed a method for preparing highly uniform monodisperse nanocrystals of Cu(2)O. The procedure also serves to demonstrate our development of a generalized method for the synthesis of transition metal oxide nanocrystals. Cu nanocrystals are initially formed and subsequently oxidized to form highly crystalline Cu(2)O. The volume change during phase transformation can induce crystal twinning. Absorption in the visible region of the spectrum gave evidence for the presence of a thin, epitaxial layer of CuO, which is blue-shifted, and appears to increase in energy as a function of decreasing particle size. XPS confirmed the thin layer of CuO, calculated to have a thickness of approximately 5 A. We note that the copper (I) oxide phase is surprisingly well-stabilized at this length scale.     

Electropolymerization of Mefenamic Acid on Copper and Copper Based Alloy as a New Strategy to Control the Release of Copper Ions from Copper Containing Devices

Poly-2-(2,3-dimethylanilino) benzoic acid (PMF) coatings on copper and brass alloy were synthesized by electrochemical oxidation of 2-(2,3-dimethylanilino) benzoic acid in the presence of oxalic acid as the reaction medium. Electrodeposition was carried out using the cyclic voltammetry technique using a silver/silver-chloride standard electrode, with a scan rate of 600 mV min^–1. Smooth and well adhered PMF coatings were electrosynthesized during sequential scanning of the potential in the range–500 mV to 1400 mV on copper and brass alloy. The electrodeposited coatings were characterized by recording the oxidation peaks at 122 mV for Cu and–0.7 mV for brass, in cyclic voltammetry and using scanning electron microscopy (SEM). Corrosion inhibition efficiency of coated copper and brass alloy was investigated by electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization techniques. The impedance results showed that the inhibition efficiency of coated copper is 89% and for coated brass 79.4% compared to the uncoated copper and brass in 0.1 M H₂SO₄.

     

A New Method of Preparing Copper Oxide from Dinitrourea Copper Salt

A new approach for the preparation of copper nanooxide by solvothermal decomposition of N, N′‐dinitrourea copper(II) salt in an aprotic solvent was developed. The resulting particles were studied by transmission electron microscopy, X‐ray photoelectron spectroscopy, and small‐angle X‐ray scattering. The effects of different solvents on shapes of the agglomerates formed are shown.     

电解重量法测定混合铜矿中自由氧化铜

建立了用于混合铜矿石中自由氧化铜测定的方法。试样用含亚硫酸钠(6g/L)的硫酸(10%)溶液浸取2h,选择性溶解铜氧化物,过滤并煮沸滤液,用去离子水稀释后电解。溶液中的铜离子电积至阴极铂网上。用火焰原子吸收光谱法检测残余于电解后液中的铜离子;同时用硝酸(1+1)溶解铂网上的铜,并用火焰原子吸收光谱法检测与阴极铜共电积的杂质元素含量,用铂阴极差重加上电积后液残余铜含量并减去共电积的杂质元素含量可计算出氧化铜矿中酸溶铜含量。与碘量法相比,不用肉眼观察颜色变化确定终点,人为误差小,结果稳定、准确。通过对加拿大氧化铜矿标准物质AMIS0050进行测定(n=12),方法准确度可靠。并选取15批次的氧化铜矿检测,与经典碘量法比对,结果令人满意。