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Cobalt Determination by Means of Flow Injection On-line Sorbent Preconcentration-Flame Atomic Absorption Spectrometry with 1-nitroso-2-naphthol as a Complexing Reagent

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Chemical Research in Chinese Universities 2001年第3期17卷 264-270页

作者： YIN Xue-feng ALI Akbar XU Guang-ming LING Yun-yang GAO Jian YE Mei-ying Department of Chemistry Zhejiang UniversityHangzhou 310027P.R.China

The suitability of 1-nitroso-2-naphthol(NN) as a complexing agent for on-line preconcentration of cobalt eluted on the C_(18) microcolumn by means of the FI-FAAS system was tested. Various parameters affecting the complex formation and its elution were optimized. A 2.3×10^(-3) mol/L reagent solution and the aqueous sample solution acidified with 0.1% (volume fraction) nitric acid were on-line mixed (6.4 mL/min) on a reaction coil set at (65±1)℃ and flowed through the microcolumn for 30 s. The pH of the mixed solution was adjusted to 3—4 with HNO_3(1 mol/L) or NaOH(1 mol/L). The adsorbed complexes in the microcolumn were eluted into the nebulizer of FAAS in 10 s with ethanol acidified with 1% HNO_3(3.0 mL/min). A good precision(1.6% for 100μg/L Co(Ⅱ), n=10), a high enrichment factor 17.2, with detection limit (3σ) 3.2μg/L, and sample throughput (90 h^(-1)) were obtained. The method was applied to the certified reference materials(CRMs), NBS-362 and NBS-364, for the determination of cobalt and the results were in good agreement with the certified values.

关键词： Cobalt FI on-line preconcentration AAS 1-nitroso-2-naphthol

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Synergistic Extraction of Lanthanides by 1-nitroso-2-naphthol and Trioctylphosphine Oxide in Paraffin Wax

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Rare Metals 2000年第4期19卷 306-311页

作者：郭效军高锦章范海燕彭波王碧邓启良康敬万西北师范大学化学系甘肃兰州 730070 西北师范大学甘肃兰州 730070

The paraffin wax was used as a diluent for 1-nitroso-2-naphthol(HA) and trioctylphosphine oxide(TOPO) in the extraction of lanthanides at 70℃. The composition of the extracted species was given as LnA_3(TOPO)_2 by means of the slope analysis. The variation of the synergistic extraction equilibrium constant(K_ sex) was investigated at 60～80℃, and the thermodynamic data were calculated. The dependence of separation factors on temperature was also studied.

关键词： Synergistic extraction Lanthanides 1-nitroso-2-naphthol Trioctylphosphine oxide

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Solid-Liquid Extraction of Some Lanthanide Complexes with 1-nitroso-2-naphthol

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Chinese Chemical Letters 2000年第7期11卷 653-654页

作者： Jin Zhang GAO Xiao Jun GUO Bi WANG Qi Liang DENG Hai Yan FAN(Department of Chemistry, Northwest Normal University, Lanzhou 730070) Department of Chemistry Northwest Normal University Lanzhou 730070 China

The extraction behavior of Sm(III), Eu(III),Er(III) and Yb(III) with 1- nitroso -2-naphthol (HA) in paraffin has been studied. The composition of,extracted complexes has been determined to be LnA(3) by slope analysis method. The effect of temperature on extraction system is also investigated and thermodynamic parameters are obtained.

关键词： solid-liquid lanthanide 1-nitroso-2-naphthol

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