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聚酰胺分离富集催化光度法测定痕量金 总被引:4,自引:0,他引:4
1 引 言聚酰胺是一种选择性很高的富集剂,在选择一定吸附条件下,普通金属离子不被吸附,只吸附金、银、钯、铱等贵金属离子。该法具有操作简便、吸附容量大,吸附速度快,容易洗脱,可重复使用等优点。在催化动力学光度分析中偶氮氯瞵Ⅲ作为被氧化的褪色剂应用的很多,但用于测定金未见报道。本文研究了痕量Au(Ⅲ)在稀硫酸的介质中催化溴酸钾氧化偶氮氯膦Ⅲ腿色的新指示反应及其动力学条件,建立了一种测定痕量金的新方法。方法的检出限为1.14 × 10~(-11)g/ml,线性范围为 0-40 pglL,该法可用于样品中痕量… 相似文献
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聚酰胺富集吸光光度法测定金 总被引:8,自引:1,他引:8
PVC-聚己内酰胺作为金的富集利,从稀盐酸或王水介中富集微量金,具有吸附速度快,容易洗脱,吸收容量大等优点,在选择的色层条件下,除贵金属和铊外,普通离子不被吸附,可广泛用于分离富集各类矿物中微量金。 相似文献
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聚酰胺和负载聚酰胺树脂富集分离环境水中无机汞 总被引:4,自引:0,他引:4
提出以聚酰胺、负载双硫腙聚酰胺、负载α-巯基苯并噻唑聚酰胺树脂为吸附剂,在静态和动态条件下,对环境水中无机汞的选择性吸附分离方法.实验表明,此3种树脂在0.1~2.5mol/L HCI介质中,对无机汞吸附性能很好,饱和吸附容量分别为:聚酰胺树脂12.28mg/g;负载双硫腙聚酰胺树脂14.48mg/g;负载α-巯基苯并噻唑聚酰胺树脂17.17mg/g.吸附到各树脂中的汞可用1%~5%硫脲溶液解脱,以冷原子吸收法测定,得到较满意的结果. 相似文献
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聚酰胺富集分离-光度法测定环境样品中痕量铊 总被引:4,自引:2,他引:4
提出以聚酰胺树脂为吸附剂,在HCl介质中,记和动态操作条件下,对环境样品中一铊的选择性吸附分离方法。树对铊(Ⅲ)有很强的吸附能力,饱和吸附容量为8.86mg/g(pH5的HCl介质中)和0.98mg/g(1.0mol/L的HCl介质中)。 相似文献
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聚酰胺富集吸光光度法测定银 总被引:4,自引:2,他引:4
聚乙内酰胺作为Ag的富集剂,从稀HNO3溶液中富集Ag具有吸附速度快,解脱容易,吸附容量大且可重复使用等优点。在选择条件下,最大吸附容量达50mL/min,并作18种元素干扰实验确定允许量。 相似文献
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泡沫塑料动态快速分离富集金方法的研究 总被引:5,自引:2,他引:5
本文系统研究了泡沫塑料动态快速分离富集金的方法。对泡沫塑料柱的处理方法,再生及主要共存离子干扰的消除等均做了较详细的研究。提出了一种简便,不控速的金分离富集的方法。该法用于分析0.051~3.59g/t四种不同含量的金标样,结果与推荐值吻合,5次分析结果,相对标准偏差<5%,同时,可用泡沫塑料柱当天连续使用分析拿标样,回收率为93%—109%。 相似文献
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液膜分离富集金与测定微量金 总被引:2,自引:0,他引:2
提出采用乳状液膜体系分离、富集金。该体系包括协同流动载体(TBP和PMBP),表面活性剂(SPAN80),膜的增强剂(液体石蜡),膜溶剂(煤油)和内相(1%质量分数的NaOH水溶液)。实验结果表明,金的迁移率达90.5%以上。此条件下,许多共存金属高于如∑RE3+、Ag2+、Pd2+、Pt4+、Rh3+、Cu2+、Fe3+、Al3+、Pb2+、Zn2+、Mo6+、W6+、Mn2+、Sn4+、Te4+、Se4+、Ca2+和Mg2+等不被迁移,只有金能与这些金属离子得到满意的分离。该法已应用于测定提金溶液和氰化物没出贵金属溶液中的微量金,相对标准偏差为1.3%-3.9%。 相似文献
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《Analytical letters》2012,45(17-18):1393-1402
Abstract An open-tubular micro capillary column was prepared by coating the inner wall of a pyrex tube (50 μm i.d.) with polyamide. Chromatographic behaviors of trace amounts of various phenolic compounds, benzoic acid derivatives and aromatic amino and nitro compounds, were examined on this column. 相似文献
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Chromatography using polyamide column is one of the most critical purification operations that affect the safety and efficacy of traditional Chinese medicine (TCM) products. To ensure successful operation and reduce time and solvent consumption, UV spectroscopy combined with multivariate data analysis as an online analytical tool was developed for monitoring the polyamide column chromatography of the TCM Danshen. The process trajectories were established by principal component analysis of the UV spectra and used to determine the endpoint of the washing stage and investigate the impacts of the process conditions. The online analysis method developed determined the concentration of salvianolic acid B (an important compound in Danshen) in the effluent rapidly and precisely with a coefficient of determination of 0.9963 and helped to collect salvianolic acid B quantitatively for determining the endpoint of elution. The methodology proposed is an effective approach applicable in guiding successful operations in the chromatographic separation. 相似文献
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HPLC study of the physicochemical characteristics of reverse-osmosis separation on a polyamide membrane material 总被引:2,自引:0,他引:2
Summary The fundamental characteristics of reverse osmosis on a polymer membrane have been correlated with HPLC experimental conditions
by using the membrane material as a column packing. Twelve formulas were used to calculate the physicochemical characteristics
of the reverse-osmosis separation process and it was found that these characteristics can be determined on the basis of retention
(t
R, VR) and partition coefficient (K) of the solute in HPLC. It seems that HPLC is an effective tool for studying the physicochemical nature of reverse-osmosis
separations and the characteristics of the polymer membrane. 相似文献
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H. Wada 《Chromatographia》1984,18(10):550-555
Summary The chromatographic separation mechanism on a polyvinyl alcohol (PVA) column in aqueous systems was explored utilizing several different types of compound such as polyethylene glycols, carbohydrates, pyrimidine and purine bases, fatty acids, monophosphate nucleotides and glycyl-peptides. Two types of separation mechanisms were found to occur for these substrates. The polyethylene glycols and the carbohydrates were eluted by size-exclusion chromatography. The retention behavior of the other substrates could be explained by the solvophobic theory, suggesting that the predominant separation mode was reversed-phase chromatography. The occurrence of reversed-phase chromatography was also indicated by the remarkable effect of the addition of ion-association reagents to the chromatographic system on the retention of the monophosphate nucleotides. 相似文献
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研究了亲水相互作用色谱柱串联C_(18)柱上三聚氰胺的色谱保留,并应用牛奶基质中三聚氰胺的高效分离。将HILIC柱与C_(18)柱串联,研究不同色谱柱串联顺序及色谱分离条件下三聚氰胺的保留情况,结果表明:当流动相为乙腈-乙酸铵(10mmol/L)=85∶15(v/v)、柱温30℃、流速0.75mL/min、检测波长220nm、HILIC柱在前C_(18)柱在后串联时,三聚氰胺分离效果最佳。在最佳的色谱条件下,对市售牛奶进行测定,未检测出三聚氰胺,加标回收率在81.1%~119%,三聚氰胺在双柱模式下分析效果良好。 相似文献