Simultaneous enrichment and determination of cadmium and mercury ions using magnetic PAMAM dendrimers as the adsorbents for magnetic solid phase extraction coupled with high performance liquid chromatography

•PAMAM dendrimers based magnetic adsorbent was prepared by a divergent method.•MNPs-PAMAM-G 2.0 earned excellent adsorption capability for Cd2+ and Hg2+.•The method provided low LODs of 0.016 and 0.04 μg L-1 for Cd2+ and Hg2+.•Present method has merits including simplicity, easy separation, low cost...

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Published in:Journal of hazardous materials 2020-03, Vol.386, p.121658-121658, Article 121658
Main Authors: Yuan, Yongyong, Wu, Yalin, Wang, Hongyuan, Tong, Yayan, Sheng, Xueying, Sun, Yi, Zhou, Xianqi, Zhou, Qingxiang
Format: Article
Language:English
Subjects:
Cadmium
High performance liquid-phase chromatography
Magnetic
Magnetic solid-phase extraction
Mercury
PAMAM dendrimers
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Summary:•PAMAM dendrimers based magnetic adsorbent was prepared by a divergent method.•MNPs-PAMAM-G 2.0 earned excellent adsorption capability for Cd2+ and Hg2+.•The method provided low LODs of 0.016 and 0.04 μg L-1 for Cd2+ and Hg2+.•Present method has merits including simplicity, easy separation, low cost, high reusability. In present study, a sensitive and efficient method based on magnetic PAMAM dendrimers as the sorbents for magnetic solid-phase extraction (MSPE) coupled with high performance liquid-phase chromatography and ultraviolet variable wavelength detector (HPLC-VWD) was developed for simultaneous determination of trace cadmium and mercury ions. Sodium diethyldithiocarbamate (DDTC-Na) was used as the chelating agent during the elution process. Parameters that would affect the extraction efficiency including PAMAM generation, adsorbent dosage, adsorption time, elution time and volume, pH and coexisting ions were investigated to achieve the best adsorption efficiency. Under the optimal conditions, good linear relationship was obtained in the range of 0.05−200 μg L-1 for Cd2+ and 0.1−200 μg L-1 for Hg2+, and the limits of detection were 0.016 and 0.040 μg L-1, respectively. The spiked recoveries of Cd2+ and Hg2+ were satisfied in the range of 91.5–105% (n = 3). The proposed method was proved to be an alternative and reliable method to determine trace Cd2+ and Hg2+ in water samples.
ISSN:0304-3894
1873-3336
DOI:10.1016/j.jhazmat.2019.121658