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首页> 外文期刊>Communications in Soil Science and Plant Analysis >Preparation of Modified Magnetic Cobalt Nanoparticles as a New Magnetic Sorbent for the Preconcentration and Determination of Trace Amounts of Lead Ions in Environmental Water and Soil (Air-Dust) Samples
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Preparation of Modified Magnetic Cobalt Nanoparticles as a New Magnetic Sorbent for the Preconcentration and Determination of Trace Amounts of Lead Ions in Environmental Water and Soil (Air-Dust) Samples

机译：作为新型磁吸附剂的改性磁性钴纳米粒子的预浓缩和测定环境水和土壤（空气灰尘）样品中痕量铅离子的测定

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摘要

In this study, cobalt magnetic nanoparticles (MNPs) were synthesized and then modified by sodium dodecyl sulfate (SDS) and 2-(5-bromo-2-pyridylazo)-5-diethyl aminophenol ligand (5-Br-PADAP), through a chemical precipitation method. Characterization of the prepared MNP adsorbents was performed by Fourier transform infrared and transmission electron microscopy. Cobalt nanoparticles (NPs) surface modified with SDS and 5-Br-PADAP was evaluated as a nanoparticulate solid-phase extraction (SPE) absorbent for lead ions Pb(II) from water and standard samples, prior to its flame atomic absorption spectrometry determination. Effects of pH, amount of sorbent, desorption solvent, adsorption time, desorption time, and interfering ion concentration on extraction efficiency were investigated. Under optimal conditions, the calibration curve was linear in the range of 1.0-500 ng mL(-1)of Pb(II) with R-2 = 0.998. Detection limit was 1.6 ng mL(-1) in the original solution (3S(b)/m), and the relative standard deviation for replicate determination of 0.5 g mL(-1) Pb(II) was +/- 2.7%.
机译：在该研究中，合成了钴磁性纳米粒子（MNP），然后通过十二烷基硫酸钠（SDS）和2-（5-溴-2-吡啶基）-5-二乙基氨基苯酚配体（5-BR-PADAP）来改性化学沉淀法。通过傅里叶变换红外和透射电子显微镜进行制备的MNP吸附剂的表征。在其火焰原子吸收光谱法测定之前，评价用SDS和5-BR-PADAP改性用SDS和5-BR-PADAP改性的纳米颗粒固相萃取（SPE）吸收剂，用于来自水和标准样品的铅离子Pb（II）。研究了pH，吸附剂，解吸溶剂，吸附时间，解吸时间和干扰离子浓度对提取效率的影响。在最佳条件下，校准曲线在1.0-500ng ml（-1）的Pb（II）的范围内为R-2 = 0.998。原始溶液中的检测限为1.6 ng ml（-1）（3℃（b）/ m），重复测定0.5g ml（-1）pb（ii）的相对标准偏差为+/- 2.7％。

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