期刊
RSC ADVANCES
卷 5, 期 25, 页码 19082-19090出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4ra13941k
关键词
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资金
- National Natural Science Foundation of China [21275038, 21405030]
- Analysis and Measurement Foundation of Zhejiang Province [2014C37094, 2014C37100]
- Scientific Research Foundation of Zhejiang Provincial Department of Education [Y201430445]
Thiol-functionalized silica microspheres (SH-SiO2) were prepared from aminosilica by usage of 3-mercaptopropionic acid for online mercury preconcentration. The adsorbent offered adsorption capacities of 27.4 mg g(-1) for Hg2+, 62.1 mg g(-1) for MeHg and 59.6 mg g(-1) for EtHg. The enrichment could be directly performed without any column preconditioning, where commonly coexisting ions in seawater and sample pH (1.0-9.0) as well as the sampling flow rate caused no significant adverse effects. The adsorbed Hg-analytes (Hg2+, MeHg and EtHg) could be readily eluted (less than 20 s) from the surface of SH-SiO2 with 60 mu L of 100 mM L-cysteine (Cys) + 0.1 M HCl. Hence the enrichment factors of 830 for Hg2+, 916 for MeHg and 883 for EtHg were obtained using 5 mL sample in a 35 s enrichment procedure. The detection limits for Hg2+, MeHg and EtHg were 0.019, 0.013 and 0.014 ng L-1, respectively, and the relative standard deviations of peak height and peak area were all below 4% for 5 ng L-1. Mercury speciation in ten seawater samples was then analyzed by the proposed method, giving rise to satisfactory spiking recoveries (90-102%).
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