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首页> 外文期刊>International journal of environmental analytical chemistry >Dispersive liquid-liquid microextraction using the freezed floating organic drop for rapid, fast, and sensitive determination of lead
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Dispersive liquid-liquid microextraction using the freezed floating organic drop for rapid, fast, and sensitive determination of lead

机译：使用冷冻的漂浮有机液滴进行分散液-液微萃取，可快速，快速而灵敏地测定铅

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摘要

A rapid, simple, and sensitive method was developed for lead preconcentration and separation in various real samples by dispersive liquid-liquid microextraction based on the freezing of floating organic drop. In this method, a suitable extraction solvent dissolved in a dispersive solvent was quickly syringed into the water sample so that the solution became turbid. Then, two phases were separated by centrifugation. The floating extractant droplet can be easily solidified on an ice bath and taken out of the water sample. Then, it can be liquefied instantly at room temperature, and analyte can be determined in it. In the creation of a hydrophobic complex with lead, 1-(2-pyridylazo)-2-naphthole (PAN) was used as the chelating agent. 1-Undecanol and acetone were used as extraction and disperser solvent. To achieve the highest recovery, some factors (type and volume of dispersive and extraction solvent, pH, PAN concentration, and salt concentration) were optimised. Under optimised conditions (pH=9, 1.0x10(-3)mol L-1 PAN, 15% w/v NaCl, 100 mu L 1-undecanol, and 0.3mL acetone), the lead calibration graph was linear from 1.5 to 80 g L-1. The detection limit and preconcentration factor were 0.5 g L-1 and 50, respectively. Lead was successfully determined in water and food (spinach, rice, potato, carrot, and black tea bag) samples by this method.
机译：开发了一种快速，简单，灵敏的方法，通过基于漂浮有机液滴的冻结的分散液-液微萃取，对各种实际样品中的铅进行预富集和分离。在该方法中，将溶解在分散溶剂中的合适的萃取溶剂快速注入到水样中，使溶液变浑浊。然后，通过离心分离两相。漂浮的萃取剂滴很容易在冰浴上固化，然后从水样中取出。然后，它可以在室温下立即液化，并可以确定其中的分析物。在与铅形成疏水复合物时，使用1-（2-吡啶基偶氮）-2-萘孔（PAN）作为螯合剂。将1-十一烷醇和丙酮用作萃取和分散剂溶剂。为了获得最高的回收率，对某些因素（分散和萃取溶剂的类型和体积，pH，PAN浓度和盐浓度）进行了优化。在最佳条件下（pH = 9、1.0x10（-3）mol L-1 PAN，15％w / v NaCl，100μL1-十一烷醇和0.3mL丙酮），铅校正曲线在1.5至80之间呈线性关系g L-1。检出限和预浓缩系数分别为0.5 g L-1和50。通过这种方法成功地测定了水和食物（菠菜，大米，土豆，胡萝卜和红茶袋）中的铅。

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