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Magnetic sulfur-doped porous carbon for preconcentration of trace mercury in environmental water prior to ICP-MS detection
Analyst ( IF 4.2 ) Pub Date : 2017-10-17 00:00:00 , DOI: 10.1039/c7an01195d
Chuyu Peng 1, 2, 3, 4, 5 , Man He 1, 2, 3, 4, 5 , Beibei Chen 1, 2, 3, 4, 5 , Lijin Huang 1, 2, 3, 4, 5 , Bin Hu 1, 2, 3, 4, 5
Affiliation  

A novel magnetic sulfur-doped porous carbon (MSPC) was fabricated via a simple one-step carbonization of a mixture of sucrose, basic magnesium sulfate whiskers and Fe3O4@SiO2 nanoparticles. Due to the high S content, the prepared MSPC possessed high adsorption capacity for Hg2+ (343 mg g−1) with good selectivity. Based on this, a method coupling magnetic solid phase extraction (MSPE) with inductively coupled plasma mass spectrometry (ICP-MS) was developed for the determination of trace Hg2+ in environmental water samples. Various parameters such as pH, desorption solvent and its concentration, desorption volume and time, sample volume, and adsorption time that affect the determination have been optimized. Under the optimal conditions, a high enrichment factor of 100-fold was obtained, the limit of detection (LOD) was found to be 0.52 pg mL−1 with a relative standard deviation (c = 10 pg mL−1, n = 7) of 7.1%, and a good linearity was obtained within the concentration range of 2–5000 pg mL−1 for Hg2+. Besides, the proposed method has very fast adsorption/desorption kinetics, target Hg2+ could be rapidly adsorbed on the prepared MSPC in 2 min and desorbed from the MSPC in 2 min with the assistance of a permanent magnet. Therefore, the proposed method of MSPE-ICP-MS exhibits good application potential in the determination of trace Hg2+ in environmental water samples.

中文翻译:

磁性硫掺杂多孔碳,用于ICP-MS检测之前对环境水中的痕量汞进行预浓缩

通过对蔗糖,碱性硫酸镁晶须和Fe 3 O 4 @SiO 2纳米颗粒的混合物进行简单的一步碳化,制得了新型的磁性硫掺杂多孔碳(MSPC)。由于高的S含量,制得的MSPC具有对Hg 2+(343 mg g -1)的高吸附能力和良好的选择性。在此基础上,开发了一种将磁固相萃取(MSPE)与电感耦合等离子体质谱(ICP-MS)耦合的方法,用于测定痕量Hg 2+在环境水样中。已优化影响测定的各种参数,例如pH,解吸溶剂及其浓度,解吸量和时间,样品量和吸附时间。在最佳条件下,获得了100倍的高富集因子,发现的检测限(LOD)为0.52 pg mL -1,相对标准偏差(c = 10 pg mL -1n = 7)Hg 2+的浓度为7.1%,并且在2–5000 pg mL -1的浓度范围内获得了良好的线性。此外,该方法具有非常快的吸附/解吸动力学,目标Hg 2+可以在2分钟内迅速吸附到制得的MSPC上,并在2分钟内借助永磁体从MSPC上解吸。因此,所提出的MSPE-ICP-MS方法在测定环境水样中的痕量Hg 2+方面具有良好的应用潜力。
更新日期:2017-11-20
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