共查询到19条相似文献,搜索用时 109 毫秒
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研究了黄原酯棉富集Hg的最佳条件,用黄原酯棉富集-冷原子吸收法测定水和地质样品中的痕量Hg,方法灵敏、快速。 相似文献
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本文研究了黄原酯棉分离富集水中痕量铜的条件,结合催化极谱,可用水中3μg/L~200μg/L铜的测定,方法简便、快速,适用性强。 相似文献
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金的富集分离方法的最新进展 总被引:2,自引:0,他引:2
本文总结了1989年以来金的富集分离方法,包括活性炭吸附法,泡沫塑料吸附法,溶剂萃取法,萃取色层法,离子交换树脂法,黄原酯棉吸附法,阐述了每种方法的最新发展概况。 相似文献
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本文介绍用黄原酯棉富集-火焰原子吸收法测定盐和水样中的痕量Pb,用于盐样中0.5—20μg/g和水样中5—200μg/L Pb的测定,结果与其它方法基本吻合。 相似文献
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研究了黄原酯棉振荡吸附Au的条件和解脱方法,并利用氢醌滴定法测定矿石中的金。方法的测定范围为0.5×10^6-××.10^-6。方法的相对标准偏差RSD=1.35%,可用于矿石中金的野外快速测定。 相似文献
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用石墨炉原子吸收法测定银,灵敏度很高,适用于岩矿中微量及痕量银的测定。但共存元素对微量银的测定有不同程度的干扰。测定前必须将银与共存元素分离,以达到消除干扰,降低测定下限的目的。分离手段一般采用有机溶剂萃取法。泡沫塑料或离子交换树脂交换法和巯基棉吸附法。其中用巯基棉分离富集银,有其独具的优点。首先可避免使用有害人体的有机溶剂,且回收率高,空白值低并较稳定。本文在原有文献的基础上,对过去的分析流程提出了改进。建立了岩矿中微量银测定的实用方法。 文献介绍,银在巯基棉上的吸附是在PH 相似文献
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近来,应用巯基棉分离富集天然水中痕量元素,开始取得较好的效果,长春地理研究所作了较多的工作,也有用于岩矿样品中痕量金的分离,巯基棉用于分离和富集某些痕量元素的优越性已开始显示出来了。 本文详细地研究了银在巯基棉上的交换行为和洗提条件,测量了分配系数和洗提曲线,考查了其它元素的吸附情况,拟定了水系沉积物中痕量银的分析方法,在规定的条件下,本法的检出限为0.06ppm,精密度(RSD%)在含量(0.1—0.2ppm)为20%左右,含量(1—3ppm)为6%左右,准确度也较好。 相似文献
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Xianzhong Cheng Kun Shao Shangyue Shen Shenghong Hu Haiou Qiu 《Geostandards and Geoanalytical Research》2011,35(4):461-469
A rapid and inexpensive method was developed for the determination of trace silver in polymetallic ore samples by use of eggshell membrane (ESM), a natural biomaterial, as the solid‐phase extraction (SPE) adsorbent coupled with flame atomic absorption spectrometry (FAAS). The ESM was used for the separation/pre‐concentration of silver, and the parameters affecting sensitivity, such as pH, sample flow rate, eluent volume and eluent flow rate, were carefully investigated. ESM was found to be an effective solid phase extractant for the adsorption of trace silver over a wide range of acidity from 0.02 to 0.50 mol l?1 HNO3. The sample solution in 0.4 mol l?1 HNO3 was pumped through an ESM microcolumn at the rate of 1.0 ml min?1. Silver was absorbed, and then eluted with a solution of 1.0% m/v thiourea–0.5% v/v HCl. Under these optimal conditions, ESM exhibited a good enrichment efficiency for silver with a dynamic adsorption capacity of 1.7 mg g?1. The proposed method was applied to the FAAS determination of trace silver in polymetallic ores and geological reference materials, GSO‐2, 3 and 5, and GSD‐11, GSD‐12, and the determined values were in good agreement with certified values. 相似文献
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电感耦合等离子体发射光谱法测高纯银中19种微量元素 总被引:1,自引:0,他引:1
应用硝酸溶解高纯银锭,用电感耦合等离子体发射光谱法测高纯银中Al、Ca、Cd、Co、Cr、Cu、Fe、Mg、Mn、Ni、Pb、Au、Pd、Pt、Rh、Si、Sn、Te、Zn等19种微量元素.为获得准确实验结果,选择合适的仪器条件和分析谱线,测定曲线做银含量匹配,并在此测定条件下分析结果的回收率和准确性,结果满意.为研究银沉淀对测定元素的影响,利用银生成AgCl沉淀的方法分离掉银,测定清液中微量元素含量.结果表明银沉淀对测试影响不大.综合测试结果可以得出,在测试过程中不需要用银做基体匹配,这样既排除了银的干扰又降低了样品测试成本. 相似文献
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冷水坑银矿位于江西省贵溪县境内,是我国最大的银矿之一,矿床类型为斑岩型。本文从该矿床的成矿地质特征和地化特征出发,着重研究矿床微量元素的分布规律,初步总结了该矿床的地球化学找矿模式,并对该矿的发展及其方向作了预测。 相似文献
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利用四价锡的氯化物沸点较低的性质,将锡挥发除去,并用硫脲络合银离子,以消除银和锡对铅测定的干扰。制定了火焰原子吸收光谱法测定银锡焊料样品中微量铅的分析方法。方法准确、可靠、简便、快速,完全适用于银锡焊料中微量铅的检验。 相似文献
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研究了利用二苯硫脲-甲基异丁酮泡塑振荡吸附富集Au、Ag的条件,并采用金试剂-TBP液珠萃取比色法测定地质样品中的金、银。方法的检出限:Au为0.5×10-9,Ag为5×10-9。 相似文献
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土壤对重金属离子的吸附容量明显受阴离子配位体的影响。本文通过试验探讨了Cl~(-),SOi_4~(2-)HCO_3~(-)阴离子在不同的pH值条件下,分别对土壤吸附铜的干扰规律。运用反求吸附参数法评价了不同阴离子对铜吸附量的干扰程度,论证了土壤与地下水之间元素迁移的规律。 相似文献
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J. Tremolada R. Dzioba A. Bernardo-Sánchez J.M. Menéndez-Aguado 《International Journal of Mineral Processing》2010,94(1-2):67-71
Laboratory scale leaching tests were carried out in different experimental conditions, with monitoring of gold and silver recovery, the concentration of cyanide used in leaching, solution pH, and precious metal adsorption onto clay. Evidence for the adsorption or re-precipitation of gold from cyanide solutions onto clay minerals is conclusive and indicates that adsorption contributes to the total gold loss from conventional cyanidation. The loss is related to the type of clay, and appears to be affected by the extent of time cyanidation. It was observed that silver adsorption capacity was above 80% and that the degree of adsorption for gold oscillated between 1.68% and 7.49%, depending on the type and characteristics of the evaluated clay. 相似文献
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R. G. Kravtsova V. L. Tauson G. A. Palyanova A. S. Makshakov L. A. Pavlova 《Geology of Ore Deposits》2017,59(5):375-390
The first data on native silver from the Rogovik Au–Ag deposit in northeastern Russia are presented. The deposit is situated in central part of the Okhotsk–Chukchi Volcanic Belt (OCVB) in the territory of the Omsukchan Trough, unique in its silver resources. Native silver in the studied ore makes up finely dispersed inclusions no larger than 50 μm in size, which are hosted in quartz; fills microfractures and interstices in association with küstelite, electrum, acanthite, silver sulfosalts and selenides, argyrodite, and pyrite. It has been shown that the chemical composition of native silver, along with its typomorphic features, is a stable indication of the various stages of deposit formation and types of mineralization: gold–silver (Au–Ag), silver–base metal (Ag–Pb), and gold–silver–base metal (Au–Ag–Pb). The specificity of native silver is expressed in the amount of trace elements and their concentrations. In Au–Ag ore, the following trace elements have been established in native silver (wt %): up to 2.72 S, up to 1.86 Au, up to 1.70 Hg, up to 1.75 Sb, and up to 1.01 Se. Native silver in Ag–Pb ore is characterized by the absence of Au, high Hg concentrations (up to 12.62 wt %), and an increase in Sb, Se, and S contents; the appearance of Te, Cu, Zn, and Fe is notable. All previously established trace elements—Hg, Au, Sb, Se, Te, Cu, Zn, Fe, and S—are contained in native silver of Au–Ag–Pb ore. In addition, Pb appears, and silver and gold amalgams are widespread, as well as up to 24.61 wt % Hg and 11.02 wt % Au. Comparison of trace element concentrations in native silver at the Rogovik deposit with the literature data, based on their solubility in solid silver, shows that the content of chalcogenides (S, Se, Te) exceeds saturated concentrations. Possible mechanisms by which elevated concentrations of these elements are achieved in native silver are discussed. It is suggested that the appearance of silver amalgams, which is unusual for Au–Ag mineralization not only in the Omsukchan Trough, but also in OCVB as a whole, is caused by superposition of the younger Dogda–Erikit Hg-bearing belt on the older Ag-bearing Omsukchan Trough. In practice, the results can be used to determine the general line of prospecting and geological exploration at objects of this type. 相似文献