期刊
ANALYTICAL METHODS
卷 6, 期 21, 页码 8569-8576出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4ay01381f
关键词
-
资金
- Fundamental Research Funds for the Central Universities
- Foundation of Geological Survey of China [12120113014300]
- China University of Geosciences (Wuhan) [CUG120117]
In this paper, a new simple and sensitive method is developed for the preconcentration of trace amounts of lead (Pb), cadmium (Cd), nickel (Ni) and cobalt (Co) ions using graphene as a solid sorbent. It was found that functionalizing graphene with dithizone could greatly improve the preconcentration capability of graphene. After sorption, the graphene adsorbed with the metal ions was collected onto a filter, and then the preconcentrated elements were directly determined by wavelength-dispersive X-ray fluorescence spectrometry (WDXRF). With the dithizone functionalized graphene, excellent enrichment factors ranging from 926 to 985 were obtained for Pb2+, Cd2+, Ni2+ and Co2+. Parameters affecting the extraction process (pH of the analyte solution, stirring time, the volume of the sample, complexing agent, adsorption capacity), and the effect of foreign metals were evaluated. Under optimum conditions, the calibration graphs were linear in the range of 0.01 mu g mL(-1) to 3.0 mu g mL(-1) with a correlation coefficient better than 0.99, detection limits of Pb2+, Cd2+, Ni2+ and Co2+ were 2.0 ng mL(-1), 6.1 ng mL(-1), 1.1 ng mL(-1), and 1.3 ng mL(-1), respectively. Quantitative recoveries (> 95%) were obtained for all four studied metal ions. The proposed method was successfully applied to measure the trace amounts of Pb2+, Cd2+, Ni2+ and Co2+ in different types of environmental water samples, and the relative expanded uncertainty of measurement of these four ions is smaller by 16%.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据