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1.
For the purpose of remediation of soils polluted by heavy metals, the use of some strong synthetic chelating agents such as ethylenediaminetetraacetic acid (EDTA) has been proposed. However, EDTA would not be considered as the preferential choice for the remediation of soil polluted with heavy metals like copper because of its nonbiodegradability and permanent residence in the natural environment. In the present work, some novel environmentally benign chelating agents, glucosamine hydrochloride, chito-oligosaccharide and
-asparaginic-N,N-diacetic acid (ASDA) were screened to find alternatives to EDTA by investigating the elution of copper from vermiculite with these reagents and comparing their effectiveness with EDTA. The effects of suspension contact time, reagent concentration and equilibrium pH of the solution on the removal of copper were examined. A stoichiometric amount of EDTA can quantitatively remove copper in both acidic and neutral conditions. Chito-oligosaccharide was a slightly less-effective reagent under acidic conditions compared to EDTA, and an amount well in excess of stoichiometry is required to achieve the maximum removal of copper from vermiculite. Glucosamine hydrochloride shows a relatively weak ability for the liberation of copper. The elution behavior of ASDA was equivalent to EDTA in acidic and neutral media. It was concluded that ASDA is the best substitute for EDTA because of its similar high complexing ability and superior biodegradability. 相似文献
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The retention mechanism of solutes under gradient conditions has been studied. Separation of a mixture of seven aromatic compounds
in the two binary mobile phase, water/methanol and water/acetonitrile, was considered as an example. Retention factors were
experimentally correlated by mobile phase composition. In this work, gradientdeviation time was newly introduced to compensate
for ideal steep band along a column and experimentally determined by a linear equation form. An analytical expression in terms
of the calculated retention factor and peak width was presented to predict the elution profile under gradient conditions.
The calculated elution profile considered by the gradient-deviation time was closer to experimental data, and this mathematical
model showed the feasibility of a predictive tool under gradient conditions. 相似文献
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《分离科学与技术》2012,47(3):297-301
Abstract Chromatography of 47 cations in 11 solvent systems has been performed on stannic molybdate ion exchange papers. Some difficult separations, e.g., Rb from Cs, Al-Be-Ga, and Tl-In, and specific separations of Ga, Au and Mg from numerous metal ions, have been achieved. R F values of some common metal ions on these papers have been compared with R F values of these cations on stannic tungstate and stannic phosphate papers. The preparation of papers is easy and the results are reproducible. 相似文献
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盛荣 《核化学与放射化学》1998,20(2):109-113
以酸性氧化铝为吸附剂,制备了一个118MBq的188W-188Re发生器,并对发生器性能进行了为期4个月的检测。结果表明,188Re的淋洗产额在80%—90%之间,188W的穿透率约为1.0×10-4%。由于采用了较大高径比的交换柱,使188Re的放射性比活度较高,能满足用于放射免疫治疗研究的抗肿瘤单克隆抗体标记的要求。 相似文献
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本文对~(60)Co γ射线诱发的中国田鼠肺成纤维细胞(V79)和小鼠离体胸腺细胞 DNA 单链断裂及其重接修复进行了实验研究。实验结束表明,两种细胞 DNA 单链断裂的程度分别在30Gy 和10Gy 剂量范围内与剂量呈线性相关;V79细胞 DNA 单链断裂的重接修复包含有快修复和慢修复过程;在不加血清的 TC199培养液中 V79细胞 DNA 断链仍能重接修复,而离体小鼠胸腺细胞在不加血清的 TC199或 RPM11640培养液中其 DNA 断链均不能重接修复,表明不同细胞 DNA 断链的重接修复所要求的细胞培养条件不同。 相似文献
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为了解决直接用水洗油砂洗油效率低的问题,进行了复配化学剂油砂热洗室内实验,考察了 NaOH和 Na2CO3及其复配溶液,XY系列洗油剂复配对内蒙古图牧吉地区一井油砂洗脱率的影响,根据油砂洗脱率指标,优选适合该地区油砂的最佳复配化学剂。结果表明,在洗油剂与油砂质量比为1∶1 ,恒温85℃,加热60 min时,NaOH与Na2CO3复配溶液的洗脱率高于单一碱液的洗脱率 ,洗油剂体系XY-1和XY-2与碱复配时,优选的洗油剂配方为 NaOH(1 .0%) + Na2CO3(1 .0%) + XY-1(0 .15%)和NaOH(1 .0% ) + Na2CO3(1 .5% ) + XY-2 (0 .10%)。 相似文献
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