β－环糊精交联聚合物包结5－Br－PADAP配合物富集铜和镍的研究

β－环糊精交联聚合物包结有机显色剂２－（５－溴－２－吡啶偶氮）－５－二乙氨基苯酚所形成的配合物树脂可与多种金属离子反应生成吸附配合物。本文报道了以这种包结配合物树脂吸附富集铜与镍的有关实验条件、反应机理以及用分光光度法进行测定的研究。结果表明，在ｐＨ＝４～６的弱酸性介质中，包结树脂可以分别从稀溶液中定量吸附铜与镍。富集倍数达到５０倍（铜）与２００倍（镍）。     

β—环糊精交联聚合物包结5—Br—PADAP配合物富集铜和镍的研究

β－环糊精交联聚合物包结有机显色剂２－（５－溴－２－吡啶偶氮）－５－二乙氨基苯酚所形成的配合物树脂可与多种金属离子反应生成吸附配合物，本文报道了以这种包结配合物树脂吸附富集铜与镍的有关实验条件，反应机理以及用分光光度法进行测定的研究，结果表明，在ｐＨ＝４～６的弱酸性介质中，包结树脂可以分别从稀溶液中定量吸附铜与镍，富集倍数达到５０倍（铜）与２００倍（镍）。     

P204萃取色谱法对Co~(2+)的分离研究

 对萃取色谱法分离钴与铜、镉、锰、锌、铁等金属离子进行了研究。用含Ｐ２０４萃取剂的萃淋树脂,经过ｐＨ４．０的ＮａＡｃ溶液转型后,只需用ｐＨ２．５的氯乙酸－氯乙酸钠缓冲溶液作为流动相淋洗,就可将钴与其它金属离子分离。方法分离效果好,操作简单方便,是分离分析钴的一种新方法。     

用ICP—AES研究茶碱负载树脂对银离子的吸附行为

采用浸渍法将茶碱负载子阳离子交换树脂上,制得茶碱负载树脂（ＴＣＲ）。在一定浓度的硝酸或氨水溶液中,茶碱负载树脂具有较好的化学稳定性。以ＩＣＰ－ＡＥＳ作为检测手段,考察了其对银离子的吸附性能。结果表明,ＴＣＲ在ｐＨ４～７范围内可定量吸附Ａｇ＾＋,２ｍｇ／ｍＬ硫脲－０．５ｍｏｌ／Ｌ ＨＮＯ３的混合溶液可作为银的良好解吸剂。该负载树脂对银的吸附容量大,选择性好,适用于痕量银的富集分离。     

地质样品中金,银,铊等元素的连续原子吸收光谱法测定

本文提出了一个一次称样连续测定金、银、铊的简便、快速的新方法。该法是以泡塑吸附金、铊，使银等定量地保留在溶液中。泡塑上的铊用ＥＤＴＡ解脱后，再用硫脲溶液继续解脱金，然后，采用原子吸收光谱法连续测定金、银、铊。方法用于黄铁矿、方铅等单矿矿物及岩石、土壤样品中ｘｎｇ／ｇ～ｘｘｘμｇ／ｇ金、银、铊的测定，获得满意结果。     

金泥中金铅铜铁连续测定

含金矿物经氰化浸取与锌丝置换所沉淀之无定型金常夹有多种元素,如铅、锌、铜、铁、银、铋及二氧化硅等,外观形态呈泥状,故俗称金泥,系工业生产的中间产品。经试验研究可采用常规容量分析方法的组合,连续测定金、铅、铜及铁。用硝酸、硫酸分解金泥试样,铅以硫酸铅沉淀析出,金不溶解,从而分离出金、铅。以醋酸钠溶解硫酸铅沉淀使与金分离。铅用EDTA容量法测定。以王水分解金,经稀释分取、蒸干,转为醋酸性溶液用碘量法测定。滤液中的Cu~(2+)、Fe~(3+)、用氨水中和,铜     

主成分回归-络合滴定法测定混合金属离子

提出了用络合滴定法测定混合金属离子，以汞膜电极为指示电极，银－氯化银电极为参比电极，以标准ＥＤＴＡ溶液滴定混合属离子溶液。采集一系列指定电位点处滴定剂的体积，并以主成分回归法处理滴定数据，利用本文方法对铜、锌、铅、钴混合溶液进行了测定，结果满意。     

铜模板交联壳聚糖对金属离子的吸附性能研究

研究了壳聚糖对CuSO4、Cu(Ac)2、Cu（NO3)2和CuCl2溶液中铜离子的吸附性能，并以各种铜盐为模板合成了戊二醛交联树脂，考察该树脂了对金属离子的选择吸附性能．结果表明，交联树脂对铜离子有较强的“记忆”功能，且以硫酸铜为模板的壳聚糖较其它盐的模板有更高的吸附量和选择性．     

含亚硫酸乙烯酯和碳酸乙烯酯功能基树脂的合成及其对贵金属离子的选择吸附性

制备了高功能基转化率的孪二羟基树脂,由此合成了含亚硫酸乙烯酯功能基(2.30毫摩尔/克树脂)和碳酸乙烯酯功能基(2.57毫摩尔/克树脂)的树脂4和5。在酸度范围内树脂4选择吸附Pt(Ⅱ),两者对Au(Ⅲ) 有高选择吸附性,而很少吸附共存的Pd(Ⅱ)、Pt(Ⅳ)及铁、钴、镍、铜、锰、锌、铅、镉等二价金属离子。树脂4对金的吸附容量为126(毫克 Au(Ⅲ)/克树脂),分配系数Kd为824(毫升/克),一次洗脱率达85％。树脂5的吸附容量为46.0(毫克 Au(Ⅲ)/克树脂),Kd为84.1(毫升/克)。两种树脂吸附Au(Ⅲ)的速率T_(1/2)分别为1、0.8小时.     

2-(2-噻唑偶氮)-5-[(N,N-二羧基甲基)氨基]苯甲酸浸渍树脂吸附金的特性及应用

用1300－Ⅱ型吸附树脂吸附噻唑偶氮类试剂制取浸渍树脂。研究了树脂对试剂和对金的吸附率及其与溶液pH值的关系，求得浸渍树脂吸附金的平衡速率和吸附容量，并在条件试验基础上拟订了柱操作分离富集微量金的方法，获得了满意的结果。     

Chelating ion-exchangers containing n-substituted hydroxylamine functional groups: Part 6. Sorption and separation of gold and silver by a polyhydroxamic acid

The sorption and desorption characteristics of gold and silver on a polyhydroxamic acid chelating resin are described. Gold is quantitatively sorbed from 0.5 M nitric acid or neutral solutions, and readily eluted with 0.5% ($\text{w}\text{v}$) potassium cyanide solution. Silver is removed from 0.05 M nitric acid or neutral solutions, and can be eluted with the cyanide solution or with 0.5 M nitric acid. Gold can be quantitatively separated from copper, iron and silver; gold and silver are sorbed from dilute cyanide solutions. Tests with river water and other eluting systems are reported.     

Gold recovery from cyanide solutions with a new fibrous polymer adsorbent

In a resin-in-pulp process for the recovery of gold cyanide from a very dilute solution it is desirable that the resin should exhibit the ability to load gold at the natural pH of the leach liquor and be stripped by an aqueous alkali. The present work describes the results of gold cyanide adsorption by new ion-exchange hollow fibers prepared by the amination of sulfochlorinated polyethylene. The fibers, chopped into suitably sized pieces, showed very fast adsorption and desorption of gold from mixed cyanide solutions.     

乙腈溶液中银电极的表面增强拉曼光谱研究

利用共焦显微拉曼系统研究了非水体系0.1mol·L^-1LiClO4/CH3CN溶液中,乙腈分子在粗糙银和金电极表面的吸附和解离行为。结果表明非水体系中乙腈可在银、金表面发生还原反应,产物CN^-离子与电极表面作用形成的表面配合物可以较宽的电位区间吸附于电极表面。溶液中的微量水、激光照射以及电极电位均对该反应有较大的影响。通过拉曼谱图的比较,得出乙腈分子解离出的CN^-在金电极表面比在银电极表面有更强的吸附作用。     

BPR树脂对Au(Ⅰ)、Ag(Ⅰ)等氰合离子的离子交换与吸附研究(Ⅰ)——吸附、解吸动力学

考察了BPR树脂在碱性条件下对金的吸附性能。研究了BPR提取Au(Ⅰ)、Ag(Ⅰ)及其它金属氰合离子的单、双组分动力学传质过程。结果表明,树脂相上氰合离子的传质速率和摩尔比与其结构类型有密切的关系,对Au(Ⅰ)等氰合离子的NH_4SCN解吸动力学作了系统的考察。     

Removal of Cyanide from Aqueous Solutions by Adsorption on Activated Carbon Prepared from Lignocellulosic By-products

Cyanide is considered one of the most dangerous compounds for the environment. They are discharged by various industries: chemical and metallurgical processes (extraction of gold and silver) and food industries. Adsorption is among the most used processes for elimination of cyanides particularly for the low concentrations. In this work, the cyanide removal is carried out by adsorption onto activated carbons prepared from olive stones and coffee ground. So we can promote this by-product as an inexpensive adsorbent. The prepared activated carbons are characterized by scanning electron micrograph and by determination of the physicochemical properties and specific surface area. All the adsorption experiments were performed in batch mode on synthetic water cyanide (KCN) at pH 10.8–11.0 to avoid volatilization of very toxic HCN. To describe the adsorption kinetics, the kinetic models of pseudo-first-order, pseudo-second-order, and intra-particle diffusion were applied. The experimental equilibrium data for adsorption of free cyanide were analyzed by the Langmuir, Freundlich, and Temkin isotherm models.     

Determination of arsenic in gold samples using matrix exchange differential pulse stripping voltammetry

A method comprising matrix exchange differential pulse stripping voltammetry (DPSV) at a gold film electrode has been proposed for the determination of small quantities of arsenic in pure gold. A wall-jet cell (WJC) and an on-line deoxygenation system were used to facilitate matrix exchange. The gold(I) cyanide complex was formed to avoid gold deposition on the electrode together with the arsenic. The pH of the sample solutions were adjusted to 3, as alkaline solutions gold(I) cyanide produced interference and the uncomplexed cyanide led to passivation of the gold film electrode. Matrix exchange electrolytes consisting of 4 mol l⁻¹ hydrochloric acid or a combination of 2 mol l⁻¹ sulphuric acid and 0.2 mol l⁻¹ hydrochloric acid could be utilised. Arsenic concentrations as low as 0.1 mg l⁻¹, could readily be detected in a gold matrix with a 60 s deposition time. While, cobalt and silver did not interfere with the arsenic determination, copper interfered even when present at similar concentrations to that of arsenic.     

Assessment of silver and gold substrates for the detection of amphetamine sulfate by surface enhanced Raman scattering (SERS)

Methods of detection of amphetamine sulfate using surface enhanced Raman scattering (SERS) from colloidal suspensions and vapour deposited films of both silver and gold are compared. Different aggregating agents are required to produce effective SERS from silver and gold colloidal suspensions. Gold colloid and vapour deposited gold films give weaker scattering than the equivalent silver substrates when high concentrations of drug are analysed but they also give lower detection limits, suggesting a smaller surface enhancement but stronger surface adsorption. A 10(-5) mol dm(-3) solution (the final concentration after addition of colloid was 10(-6) mol dm(-3)) of amphetamine sulfate was detected from gold colloid with an RSD of 5.4%. 25 microl of the same solution could be detected on a roughened gold film. The intensities of the spectra varied across the film surface resulting in relatively high RSDs. The precision was improved by averaging the scattering from several points on the surface. An attempt to improve the detection limit and precision by concentrating a suspension of gold colloid and amphetamine sulfate in aluminium wells did not give effective quantitation. Thus, positive identification and semi-quantitative estimation of amphetamine sulfate can be made quickly and easily using SERS from suspended gold colloid with the appropriate aggregating agents.     

金与银电极表面甘氨酸分子吸附作用的SERS光谱研究

本文利用表面增强拉曼光谱(SERS)技术研究了甘氨酸在金与银基底表面的吸附作用特征。研究表明甘氨酸分子以COO-的不对称形式吸附于金电极表面,且NH2也是其可能的吸附位点;而在银电极表面,则主要是通过COO-的对称形式而吸附。在此基础上,进一步研究了电极电位与溶液酸碱性对吸附于粗糙化银电极表面甘氨酸分子吸附作用的影响。研究结果表明,甘氨酸分子中去质子化羧基的吸附作用受电位影响较小,而电位对-NH3+吸附作用的影响程度较大。另一方面,溶液pH值对银电极表面的甘氨酸分子吸附行为的影响也较为显著。随着溶液酸性减小羧基倾向于相对于电极表面平行吸附。这是由于随着溶液碱性增大氨基质子化程度的减小,有利于氨基在银电极表面吸附。这将改变分子的吸附构型使其更接近于电极表面。这些变化主要出现在pH值大于10的条件下。     

Donnan dialysis of copper, gold and silver cyanides with various anion exchange membranes

Donnan dialysis is an ion exchange membrane process that can be used for the purification and concentration of diluted solutions. In this work, the behaviour of gold, silver and copper in cyanide medium is examined. Flux of cyanide complexes and corresponding free cyanide are determined using five commercial anion exchanger membranes (AMV, ACS, RAI 5035, ADP and ADS). The results show that the rate transfer depends upon the nature of the anion exchanger membrane. It is observed that the species number in the feed solution influences the transfer selectivity of metal ion complex against free cyanide Thus, gold which forms only one stable species with cyanides is transferred faster through an ACS membrane than copper which forms three species. However, this result is not verified when an ADS membrane is used. A model of the complex transfer through anion exchange membranes based on Donnan dialysis is proposed. A three compartment Donnan dialysis is performed to improve the separation between the studied metals. Decyanidation is also examined and separation factors are calculated. It is shown that Donnan dialysis can be an efficient technique for the separation of cyanides complexes of copper, gold and silver when parameters such as anion exchange membrane and the number of compartments are optimised. An advantage of this technique is also the possibility of recycling all reactants with a good impact on the environment.     

Flame atomic absorption spectrometric determination of silver after preconcentration on Amberlite XAD-16 resin from thiocyanate solution

A method of silver preconcentration by using a column containing Amberlite XAD-16 resin and this future determination by a flame AAS after elution is proposed. The effect of the factors such as pH, the nature of complexing agent, sample volume, flow rate, the type and concentration of elution solution on the preconcentration efficiency have been investigated. The influence of some matrix elements on the recovery of silver were also examined. It was found, that the quantitative recovery of thiocyanate complex of silver was obtained from nitric acid solution (pH 2) as 99.20+/-0.07% at the 95% confidence level. A preconcentration factor up to 75 could be obtained. The detection limit of silver was 0.047 mg l(-1). The adsorption of silver onto Amberlite XAD-16 can be formally described by a Langmuir equation with maximum adsorption capacity 4.66 mg g(-1) (0.043 mmol g(-1)). The proposed method was applied to determination of silver in standard alloy with relative error 6.25%.