title: Ultra-sensitive speciation analysis of mercury by CE-ICP-MS together with field-amplified sample stacking injection and dispersive solid-phase extraction.
abstract: A simple dispersive solid-phase extraction (DSPE) used to extract and preconcentrate ultra-trace MeHg, EtHg and Hg(2+) from water sample, and a sensitive method for the simultaneous analysis of MeHg, EtHg and Hg(2+) by using capillary electrophoresis-inductively coupled plasma mass spectrometry (CE-ICP-MS) with field-amplified sample stacking injection (FASI) were first reported in this study. The DSPE used thiol cotton particles as adsorbent, and is simple and effective. It can be used to extract and preconcentrate ultra-trace mercury compounds in water samples within 30 min with a satisfied recovery and no mercury species alteration during the process. The FASI enhanced the sensitivity of CE-ICP-MS with 25-fold, 29-fold and 27-fold for MeHg, EtHg and Hg(2+) , respectively. Using FASI-CE-ICP-MS together with DSPE, we have successfully determined ultra-trace MeHg, EtHg and Hg(2+) in tap water with a limits of quantification (LOQs) of 0.26-0.45 pg/mL, an RSD (n = 3) < 6% and a recovery of 92-108%. Ultra-high sensitivity, as well as much less sample and reagent consumption and low operating cost, make our method a valuable technique to the speciation analysis of ultra-trace mercury.
authors.affiliation: Key Laboratory of Analysis and Detection for Food Safety of Ministry of Education, Fujian Provincial Key Lab of Analysis and Detection for Food Safety, College of Chemistry, Fuzhou University, Fuzhou, Fujian, P. R. China.
authors.forename: YiQuan
authors.initials: Y
authors.lastname: Chen
authors.affiliation: Key Laboratory of Analysis and Detection for Food Safety of Ministry of Education, Fujian Provincial Key Lab of Analysis and Detection for Food Safety, College of Chemistry, Fuzhou University, Fuzhou, Fujian, P. R. China.
authors.forename: Xian
authors.initials: X
authors.lastname: Cheng
authors.affiliation: Key Laboratory of Analysis and Detection for Food Safety of Ministry of Education, Fujian Provincial Key Lab of Analysis and Detection for Food Safety, College of Chemistry, Fuzhou University, Fuzhou, Fujian, P. R. China.
authors.forename: Fan
authors.initials: F
authors.lastname: Mo
authors.affiliation: Key Laboratory of Analysis and Detection for Food Safety of Ministry of Education, Fujian Provincial Key Lab of Analysis and Detection for Food Safety, College of Chemistry, Fuzhou University, Fuzhou, Fujian, P. R. China.
authors.forename: LiMei
authors.initials: L
authors.lastname: Huang
authors.affiliation: Department of Plant Protection, Fujian Agriculture and Forest University, Fuzhou, Fujian, P. R. China.
authors.forename: Zujian
authors.initials: Z
authors.lastname: Wu
authors.affiliation: China National Center for Food Safety Risk Assessment, Beijing, P. R. China.
authors.forename: Yongning
authors.initials: Y
authors.lastname: Wu
authors.affiliation: Key Laboratory of Analysis and Detection for Food Safety of Ministry of Education, Fujian Provincial Key Lab of Analysis and Detection for Food Safety, College of Chemistry, Fuzhou University, Fuzhou, Fujian, P. R. China.
authors.forename: LiangJun
authors.initials: L
authors.lastname: Xu
authors.affiliation: Key Laboratory of Analysis and Detection for Food Safety of Ministry of Education, Fujian Provincial Key Lab of Analysis and Detection for Food Safety, College of Chemistry, Fuzhou University, Fuzhou, Fujian, P. R. China.
authors.forename: FengFu
authors.initials: F
authors.lastname: Fu
mesh_terms: D000479:Alkylmercury Compounds / Q000032:analysis* / Q000737:chemistry / Q000302:isolation & purification; D060766:Drinking Water / Q000737:chemistry; D019075:Electrophoresis, Capillary / Q000379:methods*; D057230:Limit of Detection; D016014:Linear Models; D013058:Mass Spectrometry / Q000379:methods*; D008628:Mercury / Q000032:analysis* / Q000737:chemistry / Q000302:isolation & purification; D015203:Reproducibility of Results; D052616:Solid Phase Extraction / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000737:chemistry / Q000302:isolation & purification
chemical_list: D000479:Alkylmercury Compounds; D060766:Drinking Water; D014874:Water Pollutants, Chemical; D008628:Mercury
keywords: Capillary electrophoresis; ICP-MS; Mercury; Solid-phase extraction; Speciation analysis