JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2014
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IF 3.552
Guangzhu Li,Miao Liu,Zhuqing Zhang,Chao Geng,Zhongbo Wu,Xin Zhao
Surface sulfhydryl-functionalized magnetic mesoporous silica nanoparticles were prepared, aiming to extract trace alkylmercury from aqueous solution. The prepared nanoparticles were characterized by TEM, ED, EDX, DLS, FTIR, and SERS. Compare with that the non-sulfhydryl-functionalized Fe 3 O 4 @SiO 2 exhibited almost no affinity for CH 3 Hg + and CH 3 CH 2 Hg + ; the sulfhydryl-functionalized Fe 3 O 4 @SiO 2 exhibited high adsorption affinity for them, resulting from chelating interaction by surface sulfhydryl group, and the adsorption was not significantly impacted by pH within the range of 3.5–9.0 or coexisting metal ions. The monolayer adsorption on surface of Fe 3 O 4 @SiO 2 –RSH could reach equilibrium in 2 min. Moreover, the CH 3 Hg + and CH 3 CH 2 Hg + adsorbed on Fe 3 O 4 @SiO 2 –RSH could be quickly separated from the matrix in a magnetic field and desorbed easily by acetonitrile and l -cysteine aqueous solution or HCl solution, and the recoveries were more than 80%. Findings of the present work highlight the potential for using Fe 3 O 4 @SiO 2 –RSH magnetic nanoparticles as effective and reusable adsorbents for extraction of ultra trace alkylmercury from environmental water samples.
研究领域:
环境科学
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纳米材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
WATER RESEARCH
·
2024
·
IF 11.4
Yurong Wu,Guangliang Liu,Xiaoquan Liu,Yuxiang Mao,Yingying Guo,Yanwei Liu,Liuchao Zhu,Yongguang Yin,Yong Cai,Guibin Jiang
Ethylmercury (EtHg), similar to methylmercury (MeHg), is highly neurotoxic and bioaccumulative. Although recent studies suggested its occurrence in natural soils and sediments, the common propylation derivatization for EtHg analysis might generate EtHg artifacts, potentially leading to its overestimation in environmental samples. Furthermore, the extensive environmental prevalence of EtHg remains unverified, keeping its importance largely uncertain. This study investigated the formation of EtHg artifacts during propylation derivatization, evaluating artifacts formation and recoveries under different extraction methods with real samples, and confirmed the widespread occurrence of EtHg in Chinese wetlands. EtHg artifacts were obviously present during the propylation derivatization and strongly dependent on the levels of Hg 2+ (0.1–10 ng) in the derivatization solution (R² = 0.99), accounting for 1.38–2.14% of Hg 2+ . CuSO 4 -HNO 3 CH 2 Cl 2 extraction (effectively removing Hg 2+ ) combined with propylation derivatization offers excellent recovery (81–86%) and low artifacts (< LOD: 1.98 × 10 −4 ng/g) for EtHg measurement in soils/sediments, with results aligning with those from online solid phase extraction-high performance liquid chromatography-inductively coupled plasma mass spectrometry (R 2 = 0.99). Additionally, we observed the occurrence of EtHg in soil and sediment samples across 14 Chinese wetlands, with concentrations varying from 6.08 to 171 pg/g, similar to MeHg concentrations at some sites. EtHg positively correlates with MeHg, total Hg, and total organic carbon across all samples, indicating a possible biological formation. These findings help better understand and predict the prevalence of EtHg in wetlands and its key role in environmental Hg cycle.
研究领域:
环境科学
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分析化学
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生态毒理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
TALANTA
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2019
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IF 4.916
Xiaoyu Jia,Junyi Zhao,Hongyun Ren,Jiani Wang,Zixiao Hong,Xian Zhang
Zwitterion-functionalized polymer microspheres (ZPMs) have been designed and used as the core adsorbent for the selective and rapid enrichment of mercury species in environmental waters by an on-line solid-phase extraction (SPE). Zwitterionic S-ZPMs and N-ZPMs having an anionic sulfonic group, but differing in cationic S + and N + moieties were prepared from Merrifield resin by treating with 1,2-ethanedithiol and imidazole , followed by modification with 1,3-propanesultone. Without any additional reagents, inorganic mercury (In-Hg), methylmercury (MeHg) and ethylmercury (EtHg) were quantitatively adsorbed on the home-made mini-column packed with ZPMs. Following extraction with 60 mM ammonium acetate and 0.15% L -cysteine ( L -Cys) solution within seconds, separation and speciation of mercury were successfully achieved by the HPLC–ICP-MS technique. Under the optimized experimental conditions, the enrichment factors (EFs) are up to 105 and 98 for inorganic and organic mercury only with 40 mL sample solution, respectively. The low detection limits of 0.78 ng L −1 , 0.63 ng L −1 , and 0.49 ng L −1 were reached for In-Hg, MeHg and EtHg, respectively, with the relative standard deviations (RSDs) below 4.1%. The feasibility and accuracy of the on-line SPE–HPLC–ICP-MS method were successfully applied for mercury speciation in surface water, seawater as well as certified reference material (CRM). The results here demonstrate a facile, sensitive and selective method for speciation of mercury at trace levels.
研究领域:
分析化学
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环境科学
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化工工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
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